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[r]" accesskey="r"><span>Siste endringar</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Spesial:Tilfeldig_side" title="Vis ei tilfeldig side [x]" accesskey="x"><span>Tilfeldig side</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/Hjelp:Innhald" title="Hjelp til å bruke alle funksjonane."><span>Hjelp</span></a></li><li id="n-kontakt" class="mw-list-item"><a href="/wiki/Wikipedia:Kontakt"><span>Kontakt</span></a></li> </ul> </div> </div> <div id="p-query" class="vector-menu mw-portlet mw-portlet-query emptyPortlet" > <div class="vector-menu-heading"> Eksterne søk </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> På andre prosjekt </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Ordovician" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q62100" title="Lenkje til tilknytt element [g]" accesskey="g"><span>Wikidata-element</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Hovudside" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; 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[o]" accesskey="o" class=""><span>Logg inn</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Fleire val" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personlege verktøy" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personlege verktøy</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Brukarmeny" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_nn.wikipedia.org&uselang=nn"><span>Gåver</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Spesial:Opprett_konto&returnto=Ordovicium" title="Me oppfordrar til at du oppretter ein konto og loggar inn, men det er ikkje påkravd."><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Opprett konto</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Spesial:Logg_inn&returnto=Ordovicium" title="Det er ikkje obligatorisk å logga inn, men medfører mange fordelar. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Logg inn</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Sider for utlogga bidragsytarar <a href="/wiki/Hjelp:Introduksjon" aria-label="Lær meir om redigering"><span>lær meir</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Spesial:Bidraga_mine" title="Liste over endringar gjorde frå denne IP-adressa [y]" accesskey="y"><span>Bidrag</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Spesial:Diskusjonssida_mi" title="Diskusjon om endringar gjorde av denne ip-adressa [n]" accesskey="n"><span>Diskusjon</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Nettstad"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Innhald" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Innhald</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">flytt til sidefeltet</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">gøym</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Byrjinga</div> </a> </li> <li id="toc-Datering" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Datering"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Datering</span> </div> </a> <ul id="toc-Datering-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Inndeling" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Inndeling"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Inndeling</span> </div> </a> <ul id="toc-Inndeling-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Paleogeografi" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Paleogeografi"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Paleogeografi</span> </div> </a> <ul id="toc-Paleogeografi-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Klima" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Klima"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Klima</span> </div> </a> <ul id="toc-Klima-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Liv_i_ordovicium" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Liv_i_ordovicium"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Liv i ordovicium</span> </div> </a> <button aria-controls="toc-Liv_i_ordovicium-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Vis/skjul underseksjonen Liv i ordovicium</span> </button> <ul id="toc-Liv_i_ordovicium-sublist" class="vector-toc-list"> <li id="toc-Dyreliv_i_ordovicium" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Dyreliv_i_ordovicium"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Dyreliv i ordovicium</span> </div> </a> <ul id="toc-Dyreliv_i_ordovicium-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Planteliv_i_ordovicium" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Planteliv_i_ordovicium"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2</span> <span>Planteliv i ordovicium</span> </div> </a> <ul id="toc-Planteliv_i_ordovicium-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Slutten_på_ordovicium" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Slutten_på_ordovicium"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Slutten på ordovicium</span> </div> </a> <ul id="toc-Slutten_på_ordovicium-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-I_Noreg" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#I_Noreg"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>I Noreg</span> </div> </a> <ul id="toc-I_Noreg-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Kjelder" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Kjelder"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Kjelder</span> </div> </a> <ul id="toc-Kjelder-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bakgrunnsstoff" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bakgrunnsstoff"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Bakgrunnsstoff</span> </div> </a> <ul id="toc-Bakgrunnsstoff-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Innhald" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Vis/skjul innhaldslista" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Vis/skjul innhaldslista</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Ordovicium</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Gå til ein artikkel på eit anna språk. Tilgjengeleg på 84 språk" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-84" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">84 språk</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Ordovicium" title="Ordovicium – norsk bokmål" lang="nb" hreflang="nb" data-title="Ordovicium" data-language-autonym="Norsk bokmål" data-language-local-name="norsk bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Ordovicium" title="Ordovicium – svensk" lang="sv" hreflang="sv" data-title="Ordovicium" data-language-autonym="Svenska" data-language-local-name="svensk" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Ordovicium" title="Ordovicium – dansk" lang="da" hreflang="da" data-title="Ordovicium" data-language-autonym="Dansk" data-language-local-name="dansk" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Ordovisium" title="Ordovisium – afrikaans" lang="af" hreflang="af" data-title="Ordovisium" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/Ordovizium" title="Ordovizium – sveitsertysk" lang="gsw" hreflang="gsw" data-title="Ordovizium" data-language-autonym="Alemannisch" data-language-local-name="sveitsertysk" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A7%D9%84%D8%B9%D8%B5%D8%B1_%D8%A7%D9%84%D8%A3%D9%88%D8%B1%D8%AF%D9%88%D9%81%D9%8A%D8%B4%D9%8A" title="العصر الأوردوفيشي – arabisk" lang="ar" hreflang="ar" data-title="العصر الأوردوفيشي" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Ordov%C3%ADcicu" title="Ordovícicu – asturisk" lang="ast" hreflang="ast" data-title="Ordovícicu" data-language-autonym="Asturianu" data-language-local-name="asturisk" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Ordovik_d%C3%B6vr%C3%BC" title="Ordovik dövrü – aserbajdsjansk" lang="az" hreflang="az" data-title="Ordovik dövrü" data-language-autonym="Azərbaycanca" data-language-local-name="aserbajdsjansk" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%85%E0%A6%B0%E0%A7%8D%E0%A6%A1%E0%A7%8B%E0%A6%AD%E0%A6%BF%E0%A6%B6%E0%A6%BF%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%A8" title="অর্ডোভিশিয়ান – bengali" lang="bn" hreflang="bn" data-title="অর্ডোভিশিয়ান" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Ordovices-k%C3%AD" title="Ordovices-kí – minnan" lang="nan" hreflang="nan" data-title="Ordovices-kí" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%90%D1%80%D0%B4%D0%BE%D0%B2%D1%96%D0%BA%D1%81%D0%BA%D1%96_%D0%BF%D0%B5%D1%80%D1%8B%D1%8F%D0%B4" title="Ардовікскі перыяд – belarusisk" lang="be" hreflang="be" data-title="Ардовікскі перыяд" data-language-autonym="Беларуская" data-language-local-name="belarusisk" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%90%D1%80%D0%B4%D0%BE%D0%B2%D1%96%D0%BA" title="Ардовік – belarusisk (klassisk ortografi)" lang="be-tarask" hreflang="be-tarask" data-title="Ардовік" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="belarusisk (klassisk ortografi)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9E%D1%80%D0%B4%D0%BE%D0%B2%D0%B8%D0%BA" title="Ордовик – bulgarsk" lang="bg" hreflang="bg" data-title="Ордовик" data-language-autonym="Български" data-language-local-name="bulgarsk" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Ordovicij" title="Ordovicij – bosnisk" lang="bs" hreflang="bs" data-title="Ordovicij" data-language-autonym="Bosanski" data-language-local-name="bosnisk" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Ordovisian" title="Ordovisian – bretonsk" lang="br" hreflang="br" data-title="Ordovisian" data-language-autonym="Brezhoneg" data-language-local-name="bretonsk" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Ordovici%C3%A0" title="Ordovicià – katalansk" lang="ca" hreflang="ca" data-title="Ordovicià" data-language-autonym="Català" data-language-local-name="katalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Ordovik" title="Ordovik – tsjekkisk" lang="cs" hreflang="cs" data-title="Ordovik" data-language-autonym="Čeština" data-language-local-name="tsjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Ordofigaidd" title="Ordofigaidd – walisisk" lang="cy" hreflang="cy" data-title="Ordofigaidd" data-language-autonym="Cymraeg" data-language-local-name="walisisk" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Ordovizium" title="Ordovizium – tysk" lang="de" hreflang="de" data-title="Ordovizium" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Ordoviitsium" title="Ordoviitsium – estisk" lang="et" hreflang="et" data-title="Ordoviitsium" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9F%CF%81%CE%B4%CE%BF%CE%B2%CE%AF%CE%BA%CE%B9%CE%B1_%CF%80%CE%B5%CF%81%CE%AF%CE%BF%CE%B4%CE%BF%CF%82" title="Ορδοβίκια περίοδος – gresk" lang="el" hreflang="el" data-title="Ορδοβίκια περίοδος" data-language-autonym="Ελληνικά" data-language-local-name="gresk" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Ordovician" title="Ordovician – engelsk" lang="en" hreflang="en" data-title="Ordovician" data-language-autonym="English" data-language-local-name="engelsk" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Ordov%C3%ADcico" title="Ordovícico – spansk" lang="es" hreflang="es" data-title="Ordovícico" data-language-autonym="Español" data-language-local-name="spansk" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Ordovicio" title="Ordovicio – esperanto" lang="eo" hreflang="eo" data-title="Ordovicio" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Ordoviziar" title="Ordoviziar – baskisk" lang="eu" hreflang="eu" data-title="Ordoviziar" data-language-autonym="Euskara" data-language-local-name="baskisk" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D8%B1%D8%AF%D9%88%DB%8C%D8%B3%DB%8C%D9%86" title="اردویسین – persisk" lang="fa" hreflang="fa" data-title="اردویسین" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Ordovicien" title="Ordovicien – fransk" lang="fr" hreflang="fr" data-title="Ordovicien" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Ordov%C3%ADcico" title="Ordovícico – galisisk" lang="gl" hreflang="gl" data-title="Ordovícico" data-language-autonym="Galego" data-language-local-name="galisisk" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%98%A4%EB%A5%B4%EB%8F%84%EB%B9%84%EC%8A%A4%EA%B8%B0" title="오르도비스기 – koreansk" lang="ko" hreflang="ko" data-title="오르도비스기" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%95%D6%80%D5%A4%D5%B8%D5%BE%D5%AB%D5%AF%D5%AB_%D5%AA%D5%A1%D5%B4%D5%A1%D5%B6%D5%A1%D5%AF%D5%A1%D5%B7%D6%80%D5%BB%D5%A1%D5%B6" title="Օրդովիկի ժամանակաշրջան – armensk" lang="hy" hreflang="hy" data-title="Օրդովիկի ժամանակաշրջան" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%93%E0%A4%B0%E0%A5%8D%E0%A4%A1%E0%A5%8B%E0%A4%B5%E0%A4%BF%E0%A4%B6%E0%A5%80_%E0%A4%95%E0%A4%B2%E0%A5%8D%E0%A4%AA" title="ओर्डोविशी कल्प – hindi" lang="hi" hreflang="hi" data-title="ओर्डोविशी कल्प" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Ordovicij" title="Ordovicij – kroatisk" lang="hr" hreflang="hr" data-title="Ordovicij" data-language-autonym="Hrvatski" data-language-local-name="kroatisk" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Ordovisium" title="Ordovisium – indonesisk" lang="id" hreflang="id" data-title="Ordovisium" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Ord%C3%B3vis%C3%ADumt%C3%ADmabili%C3%B0" title="Ordóvisíumtímabilið – islandsk" lang="is" hreflang="is" data-title="Ordóvisíumtímabilið" data-language-autonym="Íslenska" data-language-local-name="islandsk" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Ordoviciano" title="Ordoviciano – italiensk" lang="it" hreflang="it" data-title="Ordoviciano" data-language-autonym="Italiano" data-language-local-name="italiensk" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%95%D7%A8%D7%93%D7%95%D7%91%D7%99%D7%A7" title="אורדוביק – hebraisk" lang="he" hreflang="he" data-title="אורדוביק" data-language-autonym="עברית" data-language-local-name="hebraisk" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9D%E1%83%A0%E1%83%93%E1%83%9D%E1%83%95%E1%83%98%E1%83%AA%E1%83%98%E1%83%A3%E1%83%9A%E1%83%98_%E1%83%A1%E1%83%98%E1%83%A1%E1%83%A2%E1%83%94%E1%83%9B%E1%83%90" title="ორდოვიციული სისტემა – georgisk" lang="ka" hreflang="ka" data-title="ორდოვიციული სისტემა" data-language-autonym="ქართული" data-language-local-name="georgisk" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9E%D1%80%D0%B4%D0%BE%D0%B2%D0%B8%D0%BA_%D0%BA%D0%B5%D0%B7%D0%B5%D2%A3%D1%96" title="Ордовик кезеңі – kasakhisk" lang="kk" hreflang="kk" data-title="Ордовик кезеңі" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9E%D1%80%D0%B4%D0%BE%D0%B2%D0%B8%D0%BA_%D0%BC%D0%B5%D0%B7%D0%B3%D0%B8%D0%BB%D0%B8" title="Ордовик мезгили – kirgisisk" lang="ky" hreflang="ky" data-title="Ордовик мезгили" data-language-autonym="Кыргызча" data-language-local-name="kirgisisk" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Ordovicium" title="Ordovicium – latin" lang="la" hreflang="la" data-title="Ordovicium" data-language-autonym="Latina" data-language-local-name="latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Ordoviks" title="Ordoviks – latvisk" lang="lv" hreflang="lv" data-title="Ordoviks" data-language-autonym="Latviešu" data-language-local-name="latvisk" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Ordovizium" title="Ordovizium – luxemburgsk" lang="lb" hreflang="lb" data-title="Ordovizium" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxemburgsk" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Ordovikas" title="Ordovikas – litauisk" lang="lt" hreflang="lt" data-title="Ordovikas" data-language-autonym="Lietuvių" data-language-local-name="litauisk" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Ordovicium" title="Ordovicium – limburgsk" lang="li" hreflang="li" data-title="Ordovicium" data-language-autonym="Limburgs" data-language-local-name="limburgsk" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Ordovician" title="Ordovician – lingua franca nova" lang="lfn" hreflang="lfn" data-title="Ordovician" data-language-autonym="Lingua Franca Nova" data-language-local-name="lingua franca nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Ordov%C3%ADcium" title="Ordovícium – ungarsk" lang="hu" hreflang="hu" data-title="Ordovícium" data-language-autonym="Magyar" data-language-local-name="ungarsk" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9E%D1%80%D0%B4%D0%BE%D0%B2%D0%B8%D0%BA" title="Ордовик – makedonsk" lang="mk" hreflang="mk" data-title="Ордовик" data-language-autonym="Македонски" data-language-local-name="makedonsk" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mzn mw-list-item"><a href="https://mzn.wikipedia.org/wiki/%D8%A7%D9%88%D8%B1%D8%AF%D9%88%DB%8C%D8%B3%DB%8C%D9%86" title="اوردویسین – mazanderani" lang="mzn" hreflang="mzn" data-title="اوردویسین" data-language-autonym="مازِرونی" data-language-local-name="mazanderani" class="interlanguage-link-target"><span>مازِرونی</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Ordovisi" title="Ordovisi – malayisk" lang="ms" hreflang="ms" data-title="Ordovisi" data-language-autonym="Bahasa Melayu" data-language-local-name="malayisk" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/%C3%93%CC%A4-d%C3%B2%CC%A4-g%C4%AB" title="Ó̤-dò̤-gī – mindong" lang="cdo" hreflang="cdo" data-title="Ó̤-dò̤-gī" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Ordovicium" title="Ordovicium – nederlandsk" lang="nl" hreflang="nl" data-title="Ordovicium" data-language-autonym="Nederlands" data-language-local-name="nederlandsk" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%85%E0%A4%B5%E0%A4%B0%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%B5%E0%A4%BE%E0%A4%B2_%E0%A4%AF%E0%A5%81%E0%A4%97" title="अवरप्रवाल युग – nepalsk" lang="ne" hreflang="ne" data-title="अवरप्रवाल युग" data-language-autonym="नेपाली" data-language-local-name="nepalsk" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%AA%E3%83%AB%E3%83%89%E3%83%93%E3%82%B9%E7%B4%80" title="オルドビス紀 – japansk" lang="ja" hreflang="ja" data-title="オルドビス紀" data-language-autonym="日本語" data-language-local-name="japansk" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Ordovizium" title="Ordovizium – nordfrisisk" lang="frr" hreflang="frr" data-title="Ordovizium" data-language-autonym="Nordfriisk" data-language-local-name="nordfrisisk" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Ordovician" title="Ordovician – oksitansk" lang="oc" hreflang="oc" data-title="Ordovician" data-language-autonym="Occitan" data-language-local-name="oksitansk" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Ordovik_sistemasi" title="Ordovik sistemasi – usbekisk" lang="uz" hreflang="uz" data-title="Ordovik sistemasi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbekisk" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%A7%D9%88%D8%B1%DA%88%D9%88%D9%88%DB%8C%D8%B4%DB%8C%D9%86" title="اورڈوویشین – vestpunjabi" lang="pnb" hreflang="pnb" data-title="اورڈوویشین" data-language-autonym="پنجابی" data-language-local-name="vestpunjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Ordovician" title="Ordovician – piemontesisk" lang="pms" hreflang="pms" data-title="Ordovician" data-language-autonym="Piemontèis" data-language-local-name="piemontesisk" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Ordowik" title="Ordowik – polsk" lang="pl" hreflang="pl" data-title="Ordowik" data-language-autonym="Polski" data-language-local-name="polsk" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Ordoviciano" title="Ordoviciano – portugisisk" lang="pt" hreflang="pt" data-title="Ordoviciano" data-language-autonym="Português" data-language-local-name="portugisisk" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Ordovician" title="Ordovician – rumensk" lang="ro" hreflang="ro" data-title="Ordovician" data-language-autonym="Română" data-language-local-name="rumensk" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9E%D1%80%D0%B4%D0%BE%D0%B2%D0%B8%D0%BA%D1%81%D0%BA%D0%B8%D0%B9_%D0%BF%D0%B5%D1%80%D0%B8%D0%BE%D0%B4" title="Ордовикский период – russisk" lang="ru" hreflang="ru" data-title="Ордовикский период" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/Ordovician" title="Ordovician – singalesisk" lang="si" hreflang="si" data-title="Ordovician" data-language-autonym="සිංහල" data-language-local-name="singalesisk" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Ordovician" title="Ordovician – enkel engelsk" lang="en-simple" hreflang="en-simple" data-title="Ordovician" data-language-autonym="Simple English" data-language-local-name="enkel engelsk" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Ordovik" title="Ordovik – slovakisk" lang="sk" hreflang="sk" data-title="Ordovik" data-language-autonym="Slovenčina" data-language-local-name="slovakisk" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Ordovicij" title="Ordovicij – slovensk" lang="sl" hreflang="sl" data-title="Ordovicij" data-language-autonym="Slovenščina" data-language-local-name="slovensk" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Ordofisiyaan" title="Ordofisiyaan – somali" lang="so" hreflang="so" data-title="Ordofisiyaan" data-language-autonym="Soomaaliga" data-language-local-name="somali" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9E%D1%80%D0%B4%D0%BE%D0%B2%D0%B8%D1%86%D0%B8%D1%98%D1%83%D0%BC" title="Ордовицијум – serbisk" lang="sr" hreflang="sr" data-title="Ордовицијум" data-language-autonym="Српски / srpski" data-language-local-name="serbisk" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Ordovicij" title="Ordovicij – serbokroatisk" lang="sh" hreflang="sh" data-title="Ordovicij" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbokroatisk" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Ordovikikausi" title="Ordovikikausi – finsk" lang="fi" hreflang="fi" data-title="Ordovikikausi" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Ordovician" title="Ordovician – tagalog" lang="tl" hreflang="tl" data-title="Ordovician" data-language-autonym="Tagalog" data-language-local-name="tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%93%E0%AE%B0%E0%AF%8D%E0%AE%9F%E0%AF%8B%E0%AE%B5%E0%AE%BF%E0%AE%9A%E0%AE%BF%E0%AE%AF%E0%AE%95%E0%AF%8D_%E0%AE%95%E0%AE%BE%E0%AE%B2%E0%AE%AE%E0%AF%8D" title="ஓர்டோவிசியக் காலம் – tamil" lang="ta" hreflang="ta" data-title="ஓர்டோவிசியக் காலம்" data-language-autonym="தமிழ்" data-language-local-name="tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A2%E0%B8%B8%E0%B8%84%E0%B8%AD%E0%B8%AD%E0%B8%A3%E0%B9%8C%E0%B9%82%E0%B8%94%E0%B8%A7%E0%B8%B4%E0%B9%80%E0%B8%8A%E0%B8%B5%E0%B8%A2%E0%B8%99" title="ยุคออร์โดวิเชียน – thai" lang="th" hreflang="th" data-title="ยุคออร์โดวิเชียน" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Ordovisiyen" title="Ordovisiyen – tyrkisk" lang="tr" hreflang="tr" data-title="Ordovisiyen" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9E%D1%80%D0%B4%D0%BE%D0%B2%D0%B8%D1%86%D1%8C%D0%BA%D0%B8%D0%B9_%D0%BF%D0%B5%D1%80%D1%96%D0%BE%D0%B4" title="Ордовицький період – ukrainsk" lang="uk" hreflang="uk" data-title="Ордовицький період" data-language-autonym="Українська" data-language-local-name="ukrainsk" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%A2%D8%B1%D8%AF%D9%88_%D9%88%DB%8C%D8%B3%DB%8C_%D8%AF%D9%88%D8%B1" title="آردو ویسی دور – urdu" lang="ur" hreflang="ur" data-title="آردو ویسی دور" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/K%E1%BB%B7_Ordovic" title="Kỷ Ordovic – vietnamesisk" lang="vi" hreflang="vi" data-title="Kỷ Ordovic" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamesisk" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-vo mw-list-item"><a href="https://vo.wikipedia.org/wiki/Lordovig" title="Lordovig – volapyk" lang="vo" hreflang="vo" data-title="Lordovig" data-language-autonym="Volapük" data-language-local-name="volapyk" class="interlanguage-link-target"><span>Volapük</span></a></li><li class="interlanguage-link interwiki-zh-classical mw-list-item"><a href="https://zh-classical.wikipedia.org/wiki/%E5%A5%A7%E9%99%B6%E7%B4%80" title="奧陶紀 – klassisk kinesisk" lang="lzh" hreflang="lzh" data-title="奧陶紀" data-language-autonym="文言" data-language-local-name="klassisk kinesisk" class="interlanguage-link-target"><span>文言</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Ordovician" title="Ordovician – waray" lang="war" hreflang="war" data-title="Ordovician" data-language-autonym="Winaray" data-language-local-name="waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%A5%A5%E9%99%B6%E7%BA%AA" title="奥陶纪 – wu" lang="wuu" hreflang="wuu" data-title="奥陶纪" data-language-autonym="吴语" data-language-local-name="wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/%C3%8Cgb%C3%A0_%E1%BB%8C%CC%80rd%C3%B2f%C3%ADs%C3%AD%C3%A0" title="Ìgbà Ọ̀rdòfísíà – joruba" lang="yo" hreflang="yo" data-title="Ìgbà Ọ̀rdòfísíà" data-language-autonym="Yorùbá" data-language-local-name="joruba" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%A5%A7%E9%99%B6%E7%B4%80" title="奧陶紀 – kantonesisk" lang="yue" hreflang="yue" data-title="奧陶紀" data-language-autonym="粵語" data-language-local-name="kantonesisk" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%A5%A5%E9%99%B6%E7%BA%AA" title="奥陶纪 – kinesisk" lang="zh" hreflang="zh" data-title="奥陶纪" data-language-autonym="中文" data-language-local-name="kinesisk" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q62100#sitelinks-wikipedia" title="Endra mellomspråklege lenkjer" class="wbc-editpage">Endra lenkjer</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div 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href="/w/index.php?title=Ordovicium&veaction=edit" title="Endre sida [v]" accesskey="v"><span>Endre</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Ordovicium&action=edit" title="Endre kjeldekoden til sida [e]" accesskey="e"><span>Endre wikiteksten</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Ordovicium&action=history" title="Eldre versjonar av sida [h]" accesskey="h"><span>Sjå historikken</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Sideverktøy"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Verktøy" > <label id="vector-page-tools-dropdown-label" 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id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Ordovicium&action=history"><span>Sjå historikken</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Ålment </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Spesial:Lenkjer_hit/Ordovicium" title="Liste over alle wikisidene som har lenkjer hit [j]" accesskey="j"><span>Lenkjer hit</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Spesial:Relaterte_endringar/Ordovicium" rel="nofollow" title="Nylege endringar på sider denne sida lenkjar til [k]" accesskey="k"><span>Relaterte endringar</span></a></li><li id="t-upload" class="mw-list-item"><a href="//commons.wikimedia.org/wiki/Special:UploadWizard?uselang=nn" title="Last opp filer [u]" accesskey="u"><span>Last opp fil</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Spesial:Spesialsider" title="Liste over spesialsider [q]" accesskey="q"><span>Spesialsider</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Ordovicium&oldid=3524588" title="Fast lenkje til denne versjonen av sida"><span>Fast lenkje</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Ordovicium&action=info" title="Meir informasjon om sida"><span>Sideinformasjon</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Spesial:Siter&page=Ordovicium&id=3524588&wpFormIdentifier=titleform" title="Informasjon om korleis ein siterer denne sida"><span>Siter denne sida</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Spesial:UrlShortener&url=https%3A%2F%2Fnn.wikipedia.org%2Fwiki%2FOrdovicium"><span>Hent kort URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Spesial:QrCode&url=https%3A%2F%2Fnn.wikipedia.org%2Fwiki%2FOrdovicium"><span>Last ned QR-kode</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Skriv ut/eksporter </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Spesial:Bok&bookcmd=book_creator&referer=Ordovicium"><span>Opprett ei bok</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Spesial:DownloadAsPdf&page=Ordovicium&action=show-download-screen"><span>Last ned som PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Ordovicium&printable=yes" title="Utskriftsversjon av sida [p]" accesskey="p"><span>Utskriftsversjon</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Sideverktøy"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Utsjånad"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Utsjånad</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">flytt til sidefeltet</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">gøym</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Frå Wikipedia – det frie oppslagsverket</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="nn" dir="ltr"><table class="wikitable floatright" style="margin-left:1em; width:25em"> <tbody><tr> <td align="center" colspan="2" style="background-color:rgb(0,149,126)"><b>Ordovicium</b><br /><i>488.3–443.7 millionar år sidan</i><br /> <span style="display:inline-block;"></span><div id="Timeline-row" style="margin: 4px auto 0; clear:both; width:200px; padding:0px; height:18px; overflow:visible; border:1px #666; border-style:solid none; position:relative; z-index:0;"> <div id="PreЄ_marker" style="z-index:1000; position:absolute; left:5px; overflow:visible; width:0; position:absolute; height:100%;"><a href="/wiki/Prekambrium" title="Prekambrium">PreЄ</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.05; filter:alpha(opacity=5); width:1px; left:0px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.1; filter:alpha(opacity=10); width:1px; left:1px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.15; filter:alpha(opacity=15); width:1px; left:2px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.2; filter:alpha(opacity=20); width:1px; left:3px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.25; filter:alpha(opacity=25); width:1px; left:4px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.3; filter:alpha(opacity=30); width:1px; left:5px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.35; filter:alpha(opacity=30); width:1px; left:6px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.4; filter:alpha(opacity=40); width:1px; left:7px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.45; filter:alpha(opacity=45); width:1px; left:8px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.5; filter:alpha(opacity=50); width:1px; left:9px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.55; filter:alpha(opacity=55); width:1px; left:10px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.6; filter:alpha(opacity=60); width:1px; left:11px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.65; filter:alpha(opacity=65); width:1px; left:12px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.7; filter:alpha(opacity=70); width:1px; left:13px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.75; filter:alpha(opacity=75); width:1px; left:14px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.8; filter:alpha(opacity=80); width:1px; left:15px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.85; filter:alpha(opacity=85); width:1px; left:16px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.9; filter:alpha(opacity=90); width:1px; left:17px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); opacity:0.95; filter:alpha(opacity=95); width:1px; left:18px"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,220,135); left:19px; width:14.230769230769px;"></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(147,171,110); left:33.230769230769px; width:16.523076923077px;"><a href="/wiki/Kambrium" title="Kambrium">Є</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(0,149,126); left:49.753846153846px; width:13.723076923077px;"><a class="mw-selflink selflink">O</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(179,225,182); left:63.476923076923px; width:8.5230769230769px;"><a href="/wiki/Silur" title="Silur">S</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(211,160,80); left:72px; width:17.476923076923px;"><a href="/wiki/Devontida" title="Devontida">D</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(111,175,176); left:89.476923076923px; width:18.523076923077px;"><a href="/wiki/Karbontida" title="Karbontida">C</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(240,64,60); left:108px; width:14.769230769231px;"><a href="/wiki/Permtida" title="Permtida">P</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(146,76,148); left:122.76923076923px; width:15.815384615385px;"><a href="/wiki/Trias" title="Trias">T</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(0,176,222); left:138.58461538462px; width:16.646153846154px;"><a href="/wiki/Juratida" title="Juratida">J</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(127,198,78); left:155.23076923077px; width:24.615384615385px;"><a href="/wiki/Krittida" title="Krittida">K</a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(253,154,82); left:179.84615384615px; width:13.067692307692px;"><a href="/wiki/Paleogen" title="Paleogen"><small>Pg</small></a></div> <div id="bar" style="position:absolute; height:100%; text-align:center; background-color:rgb(255,230,0); left:192.91384615385px; width:7.0861538461538px;"><a href="/wiki/Neogen" title="Neogen"><small>N</small></a></div> <div id="end-border" style="position:absolute; height:100%; background-color:#666; width:1px; left:199px"></div> </div></td></tr> <tr> <td><span style="font-size:0.8em; text-align:center">Gjennomsnittleg <a href="/wiki/Oksygen" title="Oksygen"><span class="chemf">O<sub>2</sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub></span></a>-innhald i perioden</span> </td> <td><span style="font-size:0.8em; text-align:center">ca. 13.5 vol %<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><br />(68 % av dagens nivå)</span> </td></tr> <tr> <td><span style="font-size:0.8em; text-align:center">Gjennomsnittleg <a href="/wiki/Karbondioksid" title="Karbondioksid"><span class="chemf">CO<sub>2</sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub></span></a>-innhald i atmosfæren i perioden</span> </td> <td><span style="font-size:0.8em; text-align:center">ca. 4200 <a href="/wiki/Ppm" class="mw-redirect" title="Ppm">ppm</a><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><br />(15 gonger førindustrielt nivå)</span> </td></tr> <tr> <td><span style="font-size:0.8em; text-align:center">Middeltemperaturen ved jordoverflata i perioden</span> </td> <td><span style="font-size:0.8em; text-align:center">ca. 16 °C <sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><br />(2 °C over dagens nivå)</span> </td></tr> <tr> <td align="center" colspan="2"><div id="Container" class="toccolours" style="text-align: left; padding:0.5em 0 0 0; border-style:none; ; padding:0 0.5em; margin:auto;"><div id="Title" style="background-color:rgb(0,149,126); font-weight:bold; padding:0.2em; text-align:center; margin:0.6em 0 1.2em 0">Viktigaste hendingar i<br />ordovicium</div><div id="Contains-Timeline-Scale-Notes"><div style="text-align:right; position:relative; top:-1em;"><small><a href="/wiki/Mal:Ordovicium_grafisk_tidslinje" title="Mal:Ordovicium grafisk tidslinje"><span style="color:#002bb8;" title="Sjå denen tidslinja på ei eiga side">sjå</span></a> • <a href="/w/index.php?title=Maldiskusjon:Ordovicium_grafisk_tidslinje&action=edit&redlink=1" class="new" title="Maldiskusjon:Ordovicium grafisk tidslinje (sida finst ikkje)"><span style="color:#002bb8;" title="Diskuter denne malen">diskuter</span></a> • <span class="noprint plainlinksneverexpand" style="color:#002bb8;" title="Du kan endre denen tidslinja. Bruk førehandsvis før du lagrar."><a class="external text" href="https://nn.wikipedia.org/w/index.php?title=Mal:Ordovicium_grafisk_tidslinje&action=edit">endre</a></span></small></div><div id="Scale" style="width:3.1em; position:relative; top:-0.82em; float:left; height:30em; padding:0px"><div style="float:right; position:absolute; right:-1px; top:29.166666666667em;"><span style="font-size:86%;white-space:nowrap;">-490 —</span></div><div style="float:right; position:absolute; right:-1px; top:27.678571428571em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:26.190476190476em;"><span style="font-size:86%;white-space:nowrap;">-485 —</span></div><div style="float:right; position:absolute; right:-1px; top:24.702380952381em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:23.214285714286em;"><span style="font-size:86%;white-space:nowrap;">-480 —</span></div><div style="float:right; position:absolute; right:-1px; top:21.72619047619em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:20.238095238095em;"><span style="font-size:86%;white-space:nowrap;">-475 —</span></div><div style="float:right; position:absolute; right:-1px; top:18.75em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:17.261904761905em;"><span style="font-size:86%;white-space:nowrap;">-470 —</span></div><div style="float:right; position:absolute; right:-1px; top:15.77380952381em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:14.285714285714em;"><span style="font-size:86%;white-space:nowrap;">-465 —</span></div><div style="float:right; position:absolute; right:-1px; top:12.797619047619em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:11.309523809524em;"><span style="font-size:86%;white-space:nowrap;">-460 —</span></div><div style="float:right; position:absolute; right:-1px; top:9.8214285714286em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:8.3333333333333em;"><span style="font-size:86%;white-space:nowrap;">-455 —</span></div><div style="float:right; position:absolute; right:-1px; top:6.8452380952381em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:5.3571428571428em;"><span style="font-size:86%;white-space:nowrap;">-450 —</span></div><div style="float:right; position:absolute; right:-1px; top:3.8690476190476em;"><span style="font-size:86%;white-space:nowrap;">–</span></div><div style="float:right; position:absolute; right:-1px; top:2.3809523809524em;"><span style="font-size:86%;white-space:nowrap;">-445 —</span></div><div style="float:right; position:absolute; right:-1px; top:0.89285714285713em;"><span style="font-size:86%;white-space:nowrap;">–</span></div></div><div id="ScaleBar" style="width:1px; float:left; height:30em; padding:0; background-color:#242020"></div><div id="Timeline" class="toccolours" style="font-size:100%; width:100%; height:30em; padding:0px; float:left; width:11.5em; border:none; background-color:;"><div class="bar" style="font-size:100%; background-color:rgb(153,192,141); border-style: none; position:absolute; text-align:center; margin-top:0em; height:30em; margin-left:0em; width:0.575em;"><div class="nudge" style="font-size:100%; position:relative; top:-0.86em; left:-0em;"><span style="position:relative; align:center; vertical-align:middle; bottom:-15em;"> </span></div></div><div class="bar" style="font-size:100%; background-color:rgb(0,149,126); border-width:0.1em; border-style:solid none; position:absolute; text-align:center; margin-top:1.6071428571429em; height:26.347619047619em; margin-left:0.575em; width:10.925em;"><div class="nudge" style="font-size:100%; 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height:30em; margin-left:11.385em; width:0.115em;"><div class="nudge" style="font-size:100%; position:relative; top:-0.86em; left:-0em;"><span style="position:relative; align:center; vertical-align:middle; bottom:-15em;"> </span></div></div></div><div id="Annotations" style="float:left; position:relative; width:8.25em"><div id="bar" style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:17.261904761905em;"><div id="arrow" style="position:relative; text-size:100%; top:-0.86em; left:-0em; float:left;"><span style="color:black;">←</span></div><div id="nudge" style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:black; vertical-align:middle; line-height:100%; bottom:0;">Første <a href="/wiki/Spore_til_formeiring" title="Spore til formeiring">sporar</a> frå <a href="/wiki/Landplanter" class="mw-redirect" title="Landplanter">landplanter</a><sup id="cite_ref-Wellman2000_4-0" class="reference"><a href="#cite_note-Wellman2000-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></span></div></div><div id="bar" style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:15em;"><div id="nudge" style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:black; vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div id="bar" style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:15em;"><div id="nudge" style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:black; vertical-align:middle; line-height:100%; bottom:0;"></span></div></div><div id="bar" style="width:auto; font-size:100%; position:absolute; text-align:center; margin-top:15em;"><div id="nudge" style="text-size:100%; float:left; position:relative; text-align:left; top:-0.75em; left:-0em; width:7em;"><span style="position:relative; width:auto; font-size:90%; color:black; 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border-style:none; float:left; clear:both;"><span style="background:rgb(153,192,141); padding:0em .1em; border:solid 1px #242020; height:1.5em; margin:.25em .9em .25em .25em;"> </span><a href="/wiki/Paleozoikum" title="Paleozoikum">Paleozoikum</a><br clear="all" /></div><div id="Caption" class="toccolours" style="margin:0 auto; padding:0 auto; border-style:none; clear:both; text-align:center; width:23em">Viktigaste hendingar i ordovicium.<br />Til venstre: Aldrar godkjende av ICS.<br />Til høgre: «Generelle» aldrar.<br />Skala: Millionar år sidan</div></div> </td></tr></tbody></table> <p><b>Ordovicium</b> er ein <a href="/wiki/Geologisk_periode" class="mw-redirect" title="Geologisk periode">geologisk periode</a>, den andre av seks periodar, i <a href="/wiki/Paleozoikum" title="Paleozoikum">paleozoikum</a>. Han dekkjer tidsrommet frå 488,3±1,7 til 443,7±1,5 millionar år sidan. Han kjem etter <a href="/wiki/Kambrium" title="Kambrium">kambrium</a> og er etterfølgd av <a href="/wiki/Silur" title="Silur">silur</a>. Ordovicium er kalla opp etter eit <a href="/wiki/Wales" title="Wales">walisisk</a> folk kalla <a href="/w/index.php?title=Ordovikar&action=edit&redlink=1" class="new" title="Ordovikar (sida finst ikkje)">ordovikar</a> og vart definert av <a href="/w/index.php?title=Charles_Lapworth&action=edit&redlink=1" class="new" title="Charles Lapworth (sida finst ikkje)">Charles Lapworth</a> i 1879 for å løyse ein krangel mellom tilhengjarane til <a href="/w/index.php?title=Adam_Sedgwick&action=edit&redlink=1" class="new" title="Adam Sedgwick (sida finst ikkje)">Adam Sedgwick</a> og <a href="/wiki/Roderick_Murchison" title="Roderick Murchison">Roderick Murchison</a>, som plasserte dei same <a href="/wiki/Bergart" title="Bergart">bergartleia</a> nord i Wales i respektive <a href="/wiki/Kambrium" title="Kambrium">kambrium</a> og <a href="/wiki/Silur" title="Silur">silur</a>. Lapworth la merke til at <a href="/wiki/Fossil" title="Fossil">fossil</a> i dei omstridde <a href="/wiki/Stratum" class="mw-redirect" title="Stratum">stratuma</a> var forskjellige frå dei i både kambrium og silur, og innsåg at dei trong å plasserast i ein eigen periode. </p><p>Det tok si tid før ordovicium vart anerkjend i <a href="/wiki/Storbritannia" title="Storbritannia">Storbritannia</a>, medan andre område av verda raskt tok han til seg. Han vart internasjonalt godkjend i <a href="/wiki/1906" title="1906">1906</a> av <a href="/w/index.php?title=International_Geological_Congress&action=edit&redlink=1" class="new" title="International Geological Congress (sida finst ikkje)">International Geological Congress</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Datering">Datering</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=1" title="Endre bolk: Datering" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=1" title="Rediger kildekoden til seksjonen Datering"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Ordovicium startar med ei stor <a href="/wiki/Masseutrydding" title="Masseutrydding">masseutrydding</a> kalla <a href="/wiki/Den_kambrisk-ordovikiske_masseutryddinga" title="Den kambrisk-ordovikiske masseutryddinga">den kambrisk-ordovikiske masseutryddinga</a> for om lag 488,3 ± 1,7 millionar år sidan, og varte i om lag 44,6 millionar år. Han enda med ei ny stor masseutrydding for om lag 443,7 ± 1,5 millionar år sidan, som utsletta 60 % av dyreslektene i havet. Melott <i>et al.</i> (2006) føreslo at årsaka kunne ha vore eit ti sekund langt <a href="/wiki/Gammaglimt" title="Gammaglimt">gammaglimt</a> som kunne ha øydelagd <a href="/wiki/Ozonlaget" title="Ozonlaget">ozonlaget</a> og utsett livet på jorda for dødeleg stråling,<sup id="cite_ref-Melott2006_5-0" class="reference"><a href="#cite_note-Melott2006-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> men dei fleste forskarar er einige om at masseutryddingar er komplekse med fleire årsaker. </p><p>Ein har kome fram til start- og sluttidspunkt ved hjelp av nye <a href="/w/index.php?title=Radiometrisk_m%C3%A5ling&action=edit&redlink=1" class="new" title="Radiometrisk måling (sida finst ikkje)">radiometriske målingar</a> og varierer noko frå dei som er nytta i enkelte eldre kjelder. Denne andre perioden av paleozoikum er rik på <a href="/wiki/Fossil" title="Fossil">fossil</a> og i enkelte regionar store <a href="/wiki/Petroleum" title="Petroleum">petroleum</a>- og <a href="/wiki/Gass" title="Gass">gassreservoar</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Inndeling">Inndeling</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=2" title="Endre bolk: Inndeling" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=2" title="Rediger kildekoden til seksjonen Inndeling"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Ordovicium vert vanlegvis delt inn i epokane tidleg (<a href="/wiki/Tremadocium" title="Tremadocium">tremadocium</a> og <a href="/wiki/Arenig" class="mw-redirect" title="Arenig">arenig</a>), mellom (<a href="/w/index.php?title=Llanvirn&action=edit&redlink=1" class="new" title="Llanvirn (sida finst ikkje)">llanvirn</a> [vidare delt inn i abereiddium og llandeilium]) og sein (<a href="/w/index.php?title=Caradoc&action=edit&redlink=1" class="new" title="Caradoc (sida finst ikkje)">caradoc</a> og <a href="/w/index.php?title=Ashgill&action=edit&redlink=1" class="new" title="Ashgill (sida finst ikkje)">ashgill</a>). Dei tilsvarande bergartane i ordovicium vet kalla nedre, midtre og øvre del av søyla. <a href="/wiki/Geologisk_alder" title="Geologisk alder">Aldrane</a> (inndelinga av epokane) er frå yngst til eldst: </p> <ul><li><a href="/wiki/Hirnantium" title="Hirnantium">Hirnantium</a>/Gamach (Sein ordovicium: ashgill)</li> <li>Rawtheium/Richmond (Sein ordovicium: ashgill)</li> <li>Cautleium/Richmond (Sein ordovicium: ashgill)</li> <li>Pusgillium/Maysville/Richmond (Sein ordovicium: ashgill)</li></ul> <ul><li>Trenton (Mellomordovicium: caradoc)</li> <li>Onnium/Maysville/Eden (Mellomordovicium: caradoc)</li> <li>Actonium/Eden (Mellomordovicium: caradoc)</li> <li>Marshbrookium/Sherman (Mellomordovicium: caradoc)</li> <li>Longvillium/Sherman (Mellomordovicium: caradoc)</li> <li>Soundleyan/Kirkfield (Mellomordovicium: caradoc)</li> <li>Harnagium/Rockland (Mellomordovicium: caradoc)</li> <li>Costonium/Black River (Mellomordovicium: caradoc)</li> <li>Chazy (Mellomordovicium: llandeilo)</li> <li>Llandeilo (Mellomordovicium: llandeilo)</li> <li>Whiterock (Mellomordovicium: llanvirn)</li> <li>Llanvirn (Mellomordovicium: llanvirn)</li></ul> <ul><li>Cassinium (Tidleg ordovicium: arenig)</li> <li>Arenig/Jefferson/Castleman (Tidleg ordovicium: arenig)</li> <li>Tremadoc/Deming/Gaconadium (Tidleg ordovicium: Tremadoc)</li></ul> <div class="mw-heading mw-heading2"><h2 id="Paleogeografi">Paleogeografi</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=3" title="Endre bolk: Paleogeografi" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=3" title="Rediger kildekoden til seksjonen Paleogeografi"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Havnivået var høgt under ordovicium, faktisk var den marine <a href="/w/index.php?title=Transgressjon&action=edit&redlink=1" class="new" title="Transgressjon (sida finst ikkje)">transgressjonen</a> i tremadocium det største nokonsinne. Spor av dette er bevart i berglaga. </p><p>Under ordovicium samla dei sørlege <a href="/wiki/Kontinent" title="Kontinent">kontinenta</a> seg i eit enkelt kontinent kalla <a href="/wiki/Gondwana" title="Gondwana">Gondwana</a>. Gondwana starta perioden nær <a href="/wiki/Ekvator" title="Ekvator">ekvator</a> og dreiv så mot <a href="/wiki/S%C3%B8rpolen" title="Sørpolen">Sørpolen</a>. Tidleg i ordovicium var kontinenta <a href="/wiki/Laurentia" title="Laurentia">Laurentia</a>, <a href="/wiki/Siberia" title="Siberia">Siberia</a> og <a href="/wiki/Baltica" title="Baltica">Baltica</a> framleis sjølvstendige kontinent (etter oppdelinga av <a href="/wiki/Superkontinent" title="Superkontinent">superkontinentet</a> <a href="/wiki/Pannotia" title="Pannotia">Pannotia</a> tidlegare), men Baltica byrja å flytte seg mot Laurentia seinare i perioden og <a href="/wiki/Iapetushavet" title="Iapetushavet">Iapetushavet</a> krympa mellom dei. <a href="/wiki/Avalonia" title="Avalonia">Avalonia</a> braut fri frå Gondwana og starta å gå nordover mot Laurentia. <a href="/wiki/Rheichavet" title="Rheichavet">Rheichavet</a> vart danna som følgje av dette. </p><p>Bergartar frå ordovicium er hovudsakleg <a href="/wiki/Sediment%C3%A6r_bergart" title="Sedimentær bergart">sedimentære</a>. Sidan havnivået var så høgd og høgda på landjorda var låg, som igjen avgrensar <a href="/wiki/Erosjon" title="Erosjon">erosjon</a>, bestod dei marine <a href="/wiki/Sediment" title="Sediment">sedimenta</a> frå ordovicium hovudsakleg av <a href="/wiki/Kalkstein" title="Kalkstein">kalkstein</a>. <a href="/wiki/Skifer" title="Skifer">Skifer</a> og <a href="/wiki/Sandstein" title="Sandstein">sandstein</a> er ikkje like framherskande. </p><p><a href="/w/index.php?title=Den_taukoniske_orogensen&action=edit&redlink=1" class="new" title="Den taukoniske orogensen (sida finst ikkje)">Den taukoniske orogensen</a>, som starta under kambrium, førte til fjelldanning i perioden. </p><p>Mot slutten av perioden låg Gondwana nær Sørpolen og var stort sett isdekt. </p> <div class="mw-heading mw-heading2"><h2 id="Klima">Klima</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=4" title="Endre bolk: Klima" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=4" title="Rediger kildekoden til seksjonen Klima"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Tidleg i ordovicium meiner ein at klimaet var ganske varmt, i det minste i tropane. Som med <a href="/wiki/Nord-Amerika" title="Nord-Amerika">Nord-Amerika</a> og <a href="/wiki/Europa" title="Europa">Europa</a>, var Gondwana stort sett dekt av grunne hav under ordovicium. Grunt, klårt vatn over kontinentalsokkelen stimulerte veksten av organismar som med <a href="/w/index.php?title=Kalsiumkarbid&action=edit&redlink=1" class="new" title="Kalsiumkarbid (sida finst ikkje)">kalsiumkarbid</a> i skjela sine og harde delar. <a href="/wiki/Panthalassa" title="Panthalassa">Panthalassa</a> dekte det meste av den nordlege halvkula, og av mindre hav fanst <a href="/wiki/Proto-Tethys-havet" title="Proto-Tethys-havet">Proto-Tethys-havet</a>, <a href="/wiki/Paleo-Tethys-havet" title="Paleo-Tethys-havet">Paleo-Tethys-havet</a>, <a href="/wiki/Khantyhavet" title="Khantyhavet">Khantyhavet</a>, som vart lukka seint i ordovicium, <a href="/wiki/Iapetushavet" title="Iapetushavet">Iapetushavet</a> og det nye <a href="/wiki/Rheichavet" title="Rheichavet">Rheichavet</a>. </p><p>Utover i ordovicium har ein funne spor etter <a href="/wiki/Isbre" title="Isbre">isbrear</a> i landområda som i dag er <a href="/wiki/Afrika" title="Afrika">Afrika</a> og <a href="/wiki/S%C3%B8r-Amerika" title="Sør-Amerika">Sør-Amerika</a>. I denne perioden låg desse landmassane ved Sørpolen og var dekte av <a href="/wiki/Iskappe" class="mw-redirect" title="Iskappe">iskapper</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Liv_i_ordovicium">Liv i ordovicium</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=5" title="Endre bolk: Liv i ordovicium" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=5" title="Rediger kildekoden til seksjonen Liv i ordovicium"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Dyreliv_i_ordovicium">Dyreliv i ordovicium</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=6" title="Endre bolk: Dyreliv i ordovicium" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=6" title="Rediger kildekoden til seksjonen Dyreliv i ordovicium"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Sjølv om han er mindre kjend enn <a href="/wiki/Den_kambriske_eksplosjonen" title="Den kambriske eksplosjonen">den kambriske eksplosjonen</a> hadde ordovicium ei <a href="/wiki/Adaptiv_str%C3%A5ling" title="Adaptiv stråling">adaptiv stråling</a> som var minst like oppsiktsvekkjande. Talet på marine dyreslekter auka firedobbelt og førte til 12 % av det kjende marine dyrelivet i heile <a href="/wiki/Fanerozoikum" title="Fanerozoikum">fanerozoikum</a>.<sup id="cite_ref-Dixon2001_6-0" class="reference"><a href="#cite_note-Dixon2001-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Trilobittar" class="mw-redirect" title="Trilobittar">Trilobittar</a>, uledda <a href="/wiki/Armf%C3%B8tingar" title="Armføtingar">armføtingar</a>, <a href="/w/index.php?title=Archaeocyatha&action=edit&redlink=1" class="new" title="Archaeocyatha (sida finst ikkje)">archaeocyatha</a> og <a href="/w/index.php?title=Eocrinoidea&action=edit&redlink=1" class="new" title="Eocrinoidea (sida finst ikkje)">eocrinoidea</a> frå kambrium vart avløyst av dyra som skulle dominere resten av paleozoikum, som ledda armføtingar, <a href="/wiki/Blekksprutar" title="Blekksprutar">blekksprutar</a> og <a href="/wiki/Sj%C3%B8liljer" title="Sjøliljer">sjøliljer</a>, særleg dei ledda armføtingane erstatta trilobittane på kontinentalsokkelen.<sup id="cite_ref-Cooper1986_7-0" class="reference"><a href="#cite_note-Cooper1986-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Årsaka til at dette kjem hovudsakleg av utviklinga i evna hos dyra til å skilje ut <a href="/wiki/Kalsiumkarbonat" title="Kalsiumkarbonat">karbonat</a> i skjela sine i ordovicium i forhold til i kambrium.<sup id="cite_ref-Cooper1986_7-1" class="reference"><a href="#cite_note-Cooper1986-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>I Nord-Amerika og Europa var ordovicium ei tid med grunne kontinentalhav som var rike på liv. Trilobittar og armføtingar var særleg mangfaldige og talrike. Dei første <a href="/wiki/Mosdyr" title="Mosdyr">mosdyra</a> dukka opp i ordovicium, og det same gjorde dei første <a href="/wiki/Korallrev" title="Korallrev">korallreva</a>. Isolerte <a href="/wiki/Korall" title="Korall">korallar</a> går minst tilbake til kambrium. <a href="/wiki/Blautdyr" title="Blautdyr">Blautdyr</a>, som òg byrja å dukke opp i kambrium eller <a href="/wiki/Ediacara" title="Ediacara">ediacara</a> vart vanlege og varierte, særleg <a href="/wiki/Muslingar" title="Muslingar">muslingar</a>, <a href="/wiki/Sniglar" title="Sniglar">sniglar</a> og <a href="/w/index.php?title=Nautiloidar&action=edit&redlink=1" class="new" title="Nautiloidar (sida finst ikkje)">nautiloide</a> blekksprutar. Ein trudde lenge at dei første verkelege <a href="/wiki/Virveldyr" title="Virveldyr">virveldyra</a> (<a href="/w/index.php?title=Panserfisk&action=edit&redlink=1" class="new" title="Panserfisk (sida finst ikkje)">panserfisk</a>) dukka opp i ordovicium, men nylege funn i <a href="/wiki/Kina" class="mw-redirect" title="Kina">Kina</a> har vist at dei truleg eksisterte alt i tidleg kambrium. Dei første <a href="/wiki/Kjevemunn" class="mw-redirect" title="Kjevemunn">kjevemunna</a> fiskane dukka opp i <a href="/wiki/Sein_ordovicium" title="Sein ordovicium">sein ordovicium</a>. <a href="/w/index.php?title=Gratopolittar&action=edit&redlink=1" class="new" title="Gratopolittar (sida finst ikkje)">Gratopolittar</a>, som seinare døydde ut, var talrike i hava. Enkelte <a href="/w/index.php?title=Cystoidar&action=edit&redlink=1" class="new" title="Cystoidar (sida finst ikkje)">cystoidar</a> og sjøliljer dukka òg opp. </p><p>I mellomordovicium var det ein stor auke i intensiteten og mangfaldet av bioeroderande organismar. Dette vart kalla den ordovikiske <a href="/wiki/Bioerosjon" title="Bioerosjon">bioerosjon</a>-revolusjonen.<sup id="cite_ref-WilsonPalmer2006_8-0" class="reference"><a href="#cite_note-WilsonPalmer2006-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Dette er markert med ein brå auke i sporfossil i harde substrat som <i>trypanitar</i>, <i>palaeosabella</i> og <i>petroxestar</i>. </p><p>Trilobittane i ordovicium var særs forskjellige frå forgjengarane i kambrium. Mange trilobittar utvikla bisarre ryggrader og knollar for å forsvare seg mot rovdyr som primitive <a href="/wiki/Hai" class="mw-redirect" title="Hai">haiar</a> og <a href="/wiki/Blekksprutar" title="Blekksprutar">blekksprutar</a>, medan andre trilobittar som <a href="/w/index.php?title=Aeglina_prisca&action=edit&redlink=1" class="new" title="Aeglina prisca (sida finst ikkje)">Aeglina prisca</a> utvikla seg til symjande former. Enkelt trilobittar utvikla ein spadeliknande snute for å tråle seg gjennom gjørma på havbotn etter mat. Ei anna gruppe trilobittar kalla <a href="/w/index.php?title=Trinucleidar&action=edit&redlink=1" class="new" title="Trinucleidar (sida finst ikkje)">trinucleidar</a> utvikla breie fordjupningar rundt hovudskjoldet.<sup id="cite_ref-Palaeos.com_9-0" class="reference"><a href="#cite_note-Palaeos.com-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Andre trilobittar som <a href="/w/index.php?title=Asaphus_kowalewski&action=edit&redlink=1" class="new" title="Asaphus kowalewski (sida finst ikkje)">Asaphus kowalewski</a> utvikla lange augestilkar for å kunne lettare oppdage rovdyr, medan enkelte trilobittar mista augo heilt.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:OrdovicianEdrio.jpg" class="mw-file-description" title="Øvre ordovicium edrioasteroidar, Cystaster stellatus, stein frå Kope-formasjonen nord i Kentucky. Edrioasteroidane er om lag 1,5 cm i diameter. I bakgrunnen er eit rundmunna mosdyr, corynotrypa."><img alt="Øvre ordovicium edrioasteroidar, Cystaster stellatus, stein frå Kope-formasjonen nord i Kentucky. Edrioasteroidane er om lag 1,5 cm i diameter. I bakgrunnen er eit rundmunna mosdyr, corynotrypa." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/OrdovicianEdrio.jpg/120px-OrdovicianEdrio.jpg" decoding="async" width="120" height="91" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/OrdovicianEdrio.jpg/180px-OrdovicianEdrio.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5c/OrdovicianEdrio.jpg/240px-OrdovicianEdrio.jpg 2x" data-file-width="900" data-file-height="680" /></a></span></div> <div class="gallerytext">Øvre ordovicium edrioasteroidar, <i>Cystaster stellatus</i>, stein frå Kope-formasjonen nord i Kentucky. Edrioasteroidane er om lag 1,5 cm i diameter. I bakgrunnen er eit rundmunna <a href="/wiki/Mosdyr" title="Mosdyr">mosdyr</a>, <i>corynotrypa</i>.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:FossilMtnUT.jpg" class="mw-file-description" title="Fossilfjellet, vest i Utah med fossilførande skifer og kalkstein frå midtre ordovicium i nedre halvdel."><img alt="Fossilfjellet, vest i Utah med fossilførande skifer og kalkstein frå midtre ordovicium i nedre halvdel." src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f2/FossilMtnUT.jpg/120px-FossilMtnUT.jpg" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f2/FossilMtnUT.jpg/180px-FossilMtnUT.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f2/FossilMtnUT.jpg/240px-FossilMtnUT.jpg 2x" data-file-width="1500" data-file-height="1125" /></a></span></div> <div class="gallerytext">Fossilfjellet, vest i Utah med fossilførande skifer og kalkstein frå midtre ordovicium i nedre halvdel.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:OrdOutcropTN.JPG" class="mw-file-description" title="Frambrot av kalkstein og skifer frå øvre ordovicium, sentralt i Tennessee."><img alt="Frambrot av kalkstein og skifer frå øvre ordovicium, sentralt i Tennessee." src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/OrdOutcropTN.JPG/103px-OrdOutcropTN.JPG" decoding="async" width="103" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/OrdOutcropTN.JPG/154px-OrdOutcropTN.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/OrdOutcropTN.JPG/205px-OrdOutcropTN.JPG 2x" data-file-width="700" data-file-height="818" /></a></span></div> <div class="gallerytext">Frambrot av kalkstein og skifer frå øvre ordovicium, sentralt i Tennessee.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:LibertyBorings.jpg" class="mw-file-description" title="Trypanitt-boring i hardground frå ordovicium. Søraust i Indiana.[11]"><img alt="Trypanitt-boring i hardground frå ordovicium. Søraust i Indiana.[11]" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/LibertyBorings.jpg/120px-LibertyBorings.jpg" decoding="async" width="120" height="80" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/LibertyBorings.jpg/180px-LibertyBorings.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/27/LibertyBorings.jpg/240px-LibertyBorings.jpg 2x" data-file-width="300" data-file-height="200" /></a></span></div> <div class="gallerytext"><i>Trypanitt-boring</i> i <a href="/w/index.php?title=Hardground&action=edit&redlink=1" class="new" title="Hardground (sida finst ikkje)">hardground</a> frå ordovicium. Søraust i Indiana.<sup id="cite_ref-WilsonPalmer2001_11-0" class="reference"><a href="#cite_note-WilsonPalmer2001-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup></div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:Petroxestes_borings_Ordovician.jpg" class="mw-file-description" title="Petroxestar-boringar i hardground frå ordovicium, sør i Ohio.[8]"><img alt="Petroxestar-boringar i hardground frå ordovicium, sør i Ohio.[8]" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b9/Petroxestes_borings_Ordovician.jpg/82px-Petroxestes_borings_Ordovician.jpg" decoding="async" width="82" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b9/Petroxestes_borings_Ordovician.jpg/123px-Petroxestes_borings_Ordovician.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b9/Petroxestes_borings_Ordovician.jpg/164px-Petroxestes_borings_Ordovician.jpg 2x" data-file-width="536" data-file-height="786" /></a></span></div> <div class="gallerytext"><i>Petroxestar-boringar</i> i hardground frå ordovicium, sør i Ohio.<sup id="cite_ref-WilsonPalmer2006_8-1" class="reference"><a href="#cite_note-WilsonPalmer2006-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:OrdFossilsMN.JPG" class="mw-file-description" title="Armføtingar og mosdyr i kalkstein frå ordovicium, sør i Minnesota."><img alt="Armføtingar og mosdyr i kalkstein frå ordovicium, sør i Minnesota." src="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/OrdFossilsMN.JPG/120px-OrdFossilsMN.JPG" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/OrdFossilsMN.JPG/180px-OrdFossilsMN.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/OrdFossilsMN.JPG/240px-OrdFossilsMN.JPG 2x" data-file-width="1600" data-file-height="1200" /></a></span></div> <div class="gallerytext"><a href="/wiki/Armf%C3%B8tingar" title="Armføtingar">Armføtingar</a> og <a href="/wiki/Mosdyr" title="Mosdyr">mosdyr</a> i kalkstein frå ordovicium, sør i Minnesota.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:PlatystrophiaOrdovician.jpg" class="mw-file-description" title="Platystrophia ponderosa, øvre ordovicium nær Madison, Indiana. Den raude streken er 5,0 mm."><img alt="Platystrophia ponderosa, øvre ordovicium nær Madison, Indiana. Den raude streken er 5,0 mm." src="//upload.wikimedia.org/wikipedia/commons/thumb/7/71/PlatystrophiaOrdovician.jpg/120px-PlatystrophiaOrdovician.jpg" decoding="async" width="120" height="94" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/71/PlatystrophiaOrdovician.jpg/180px-PlatystrophiaOrdovician.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/71/PlatystrophiaOrdovician.jpg/240px-PlatystrophiaOrdovician.jpg 2x" data-file-width="1844" data-file-height="1452" /></a></span></div> <div class="gallerytext"><i><a href="/w/index.php?title=Platystrophia&action=edit&redlink=1" class="new" title="Platystrophia (sida finst ikkje)">Platystrophia</a> ponderosa</i>, øvre ordovicium nær Madison, Indiana. Den raude streken er 5,0 mm.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:GraptoliteEchinosphaerites.jpg" class="mw-file-description" title="Cystoiden Echinosphaerites (ein utdøydd pigghudingart) frå ordovicium funne nordaust i Estland."><img alt="Cystoiden Echinosphaerites (ein utdøydd pigghudingart) frå ordovicium funne nordaust i Estland." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/GraptoliteEchinosphaerites.jpg/120px-GraptoliteEchinosphaerites.jpg" decoding="async" width="120" height="100" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/GraptoliteEchinosphaerites.jpg/180px-GraptoliteEchinosphaerites.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/57/GraptoliteEchinosphaerites.jpg/240px-GraptoliteEchinosphaerites.jpg 2x" data-file-width="2832" data-file-height="2370" /></a></span></div> <div class="gallerytext">Cystoiden <i>Echinosphaerites</i> (ein utdøydd <a href="/wiki/Pigghuding" class="mw-redirect" title="Pigghuding">pigghudingart</a>) frå ordovicium funne nordaust i <a href="/wiki/Estland" title="Estland">Estland</a>.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:Prasopora.JPG" class="mw-file-description" title="Prasopora, eit trepostom mosdyr frå ordovicium i Iowa."><img alt="Prasopora, eit trepostom mosdyr frå ordovicium i Iowa." src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Prasopora.JPG/120px-Prasopora.JPG" decoding="async" width="120" height="73" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Prasopora.JPG/180px-Prasopora.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Prasopora.JPG/240px-Prasopora.JPG 2x" data-file-width="750" data-file-height="454" /></a></span></div> <div class="gallerytext"><i>Prasopora</i>, eit trepostom mosdyr frå ordovicium i Iowa.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fil:EncrustedStroph.JPG" class="mw-file-description" title="Ein strophomenid armføting frå ordovicium med armføtingar og eit mosdyr rundt."><img alt="Ein strophomenid armføting frå ordovicium med armføtingar og eit mosdyr rundt." src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/EncrustedStroph.JPG/120px-EncrustedStroph.JPG" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/EncrustedStroph.JPG/180px-EncrustedStroph.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ab/EncrustedStroph.JPG/240px-EncrustedStroph.JPG 2x" data-file-width="1600" data-file-height="1200" /></a></span></div> <div class="gallerytext">Ein strophomenid armføting frå ordovicium med armføtingar og eit mosdyr rundt. </div> </li> </ul> <div class="mw-heading mw-heading3"><h3 id="Planteliv_i_ordovicium">Planteliv i ordovicium</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=7" title="Endre bolk: Planteliv i ordovicium" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=7" title="Rediger kildekoden til seksjonen Planteliv i ordovicium"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/w/index.php?title=Gr%C3%B8nalgar&action=edit&redlink=1" class="new" title="Grønalgar (sida finst ikkje)">Grønalgar</a> var vanleg i ordovicium og sein kambrium (kanskje tidlegare). Planter utvikla seg truleg frå grønalger. Dei første plantene på landjorda dukka opp i form av små ikkje-vaskulære planter som likna <a href="/wiki/Levermosar" title="Levermosar">levermosar</a>. Fossile sporar frå landplanter er funne i dei øvre ordovicium-sedimenta, men dei første <a href="/wiki/Soppar" class="mw-redirect" title="Soppar">landsoppane</a> kan ha vore<a href="/w/index.php?title=Arbuscular_mycorrhiza&action=edit&redlink=1" class="new" title="Arbuscular mycorrhiza (sida finst ikkje)">arbuscular mycorrhiza</a> (<a href="/w/index.php?title=Glomerales&action=edit&redlink=1" class="new" title="Glomerales (sida finst ikkje)">glomerales</a>), som spelte ei avgjerande rolle i å kolonisere landjorda for plantene gjennom playing a crucial role in facilitating the colonization of land by plants through <a href="/wiki/Mykorrhiza" title="Mykorrhiza">mykorrhizal</a> symbiose, som gjorde mineralske næringsstoff tilgjengeleg for planteceller. Slike fossilerte soppar og sporar frå ordovicium er funne i Wisconsin med ein alder på om lag 460 millionar år.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>Det var mykje marin sopp i hava i ordovicium som løyste opp dyrekadaver og anna avfall.<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Kjelder" title="Wikipedia:Kjelder"><span title="Det som står før denne taggen bør ha ei kjelde.">treng kjelde</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="Slutten_på_ordovicium"><span id="Slutten_p.C3.A5_ordovicium"></span>Slutten på ordovicium</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=8" title="Endre bolk: Slutten på ordovicium" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=8" title="Rediger kildekoden til seksjonen Slutten på ordovicium"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="boilerplate seealso"> <dl><dd><i>For meir om dette emnet, sjå <a href="/w/index.php?title=Den_ordovikiske-siluriske_masseutryddinga&action=edit&redlink=1" class="new" title="Den ordovikiske-siluriske masseutryddinga (sida finst ikkje)">Den ordovikiske-siluriske masseutryddinga</a>.</i></dd></dl></div> <p>Ordovicium enda i ei rekkje <a href="/wiki/Masseutrydding" title="Masseutrydding">masseutryddingar</a>, som sett under eitt, var den nest største av dei fem masseutryddingane i jorda si historie i form av prosent av slektene som døydde ut. Berre den permisk-triassiske masseutryddinga var større. </p><p>Utryddingane skjedde for om lag 444-446 millionar år sidan og markerte grensa mellom ordovicium og den påfølgjande perioden <a href="/wiki/Silur" title="Silur">silur</a>. På denne tida levde alle fleircella organismar i havet og om lag 49 % av dyreslektene forsvann for alltid. <a href="/wiki/Armf%C3%B8tingar" title="Armføtingar">Armføtingar</a> og <a href="/wiki/Mosdyr" title="Mosdyr">mosdyr</a> vart sterkt redusert, i lag med mange <a href="/wiki/Trilobittar" class="mw-redirect" title="Trilobittar">trilobittar</a>, <a href="/w/index.php?title=Konodontar&action=edit&redlink=1" class="new" title="Konodontar (sida finst ikkje)">konodontar</a> og <a href="/w/index.php?title=Graptolittar&action=edit&redlink=1" class="new" title="Graptolittar (sida finst ikkje)">graptolittar</a>. </p><p>Den mest aksepterte teorien som skapte desse hendingane vart at dei vart utløyst av ei <a href="/wiki/Istid" title="Istid">istid</a>. I alderen hirantium enda ein lang periode med stabile drivhus-tilhøve. Istida vart truleg ikkje like lenge som forskarane ein gong trudde, og studiar av <a href="/wiki/Oksygen" title="Oksygen">oksygen</a>-isotopar i fossile armføtingar viser at han truleg ikkje varte meir enn 0,5 til 1,5 millionar år.<sup id="cite_ref-Stanley1999_13-0" class="reference"><a href="#cite_note-Stanley1999-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> Før masseutryddingane har ein funne spor etter eit fall i atmosfærisk <a href="/wiki/Karbondioksid" title="Karbondioksid">karbondioksid</a> frå 7000ppm til 4400ppm, som selektivt påverka dei grunne havområda der dei fleste organismane levde. Då det sørlege superkontinentet dreiv mot Sørpolen, danna det seg iskapper over det, og dette ser ein igjen i øvre ordovicium-lag i <a href="/wiki/Nord-Afrika" title="Nord-Afrika">Nord-Afrika</a> og <a href="/wiki/S%C3%B8r-Amerika" title="Sør-Amerika">Sør-Amerika</a>, som då låg ved sida av kvarandre. </p><p>Istidene bind opp vatn frå verdshava, medan vatnet vert slept fri i mellomistidene, og dette fører til at havnivået aukar eller minkar raskt. Dei grunne havområda i ordovicium trekte seg tilbake og øydela mange økologiske nisjar.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> Artar som heldt til i epikontinentale havområde på ein viss landmasse vart særleg hardt råka.<sup id="cite_ref-Stanley1999_13-1" class="reference"><a href="#cite_note-Stanley1999-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> Dei tropiske livsformene vart hardt råka under den første masseutryddinga, medan artane som levde i kjøligare farvatn vart hardaste råka i den andre bølgja.<sup id="cite_ref-Stanley1999_13-2" class="reference"><a href="#cite_note-Stanley1999-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p><p>Artane som overlevde var dei som takla endringane og fylte dei økologiske nisjane som mangla etter masseutryddingane. </p><p>Mot slutten av den andre hendinga førte smeltande isbrear til at havnivået auka og stabiliserte seg igjen. Dette førte til at mangfaldet auke igjen på kontinentalsoklane og i starten av silur fekk ein igjen biologisk mangfald i dei artane som hadde overlevd. </p> <div class="mw-heading mw-heading2"><h2 id="I_Noreg">I Noreg</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=9" title="Endre bolk: I Noreg" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=9" title="Rediger kildekoden til seksjonen I Noreg"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I Noreg finst det to <a href="/w/index.php?title=Serie_i_geologi&action=edit&redlink=1" class="new" title="Serie i geologi (sida finst ikkje)">seriar</a> med bergartar frå ordovicium. Den eine serien er bergartar som er danna av sediment avsett på ei grunn plattform, og den andre er danna i det tidlegare <a href="/wiki/Iapetushavet" title="Iapetushavet">Iapetushavet</a> nordvest for den noverande kysten og seinare skyvd inn i <a href="/wiki/Den_kaledonske_fjellkjeda" class="mw-redirect" title="Den kaledonske fjellkjeda">Den kaledonske fjellkjeda</a>. </p><p>Den første serien består av svarte og grå <a href="/wiki/Skifer" title="Skifer">skiferar</a>, <a href="/wiki/Siltstein" title="Siltstein">siltstein</a>, <a href="/w/index.php?title=Knolleskifer&action=edit&redlink=1" class="new" title="Knolleskifer (sida finst ikkje)">knolleskifer</a>, <a href="/wiki/Knollekalk" title="Knollekalk">knollekalk</a>, <a href="/wiki/Kalkstein" title="Kalkstein">kalkstein</a> og <a href="/wiki/Sandstein" title="Sandstein">sandstein</a> og finst særleg i <a href="/wiki/Oslofeltet" title="Oslofeltet">Oslofeltet</a> og langs randen av fjellkjeda mellom <a href="/wiki/Stavanger" title="Stavanger">Stavanger</a> og <a href="/wiki/Finnmark" class="mw-redirect" title="Finnmark">Finnmark</a>. Dei oppstod i eit grunt hav som strekte seg over <a href="/wiki/Sverige" title="Sverige">Sverige</a> frå <a href="/wiki/Baltikum" title="Baltikum">Baltikum</a>. Dette området låg på denne tida noko sær for <a href="/wiki/Ekvator" title="Ekvator">ekvator</a> på <a href="/wiki/Den_s%C3%B8rlege_halvkula" title="Den sørlege halvkula">den sørlege halvkula</a>. </p><p>Den andre serien finst hovudsakleg vest i landet, heile vegen mellom Stavanger og Finnmark. Serien inneheld både omdanna avleiringar, <a href="/wiki/Magmatiske_bergartar" class="mw-redirect" title="Magmatiske bergartar">magmatiske bergartar</a> og gammal havbotn som vart stuva saman og transportert søraustover som <a href="/wiki/Skyvedekke" title="Skyvedekke">skyvedekke</a>. Her finst enkelte godt bevarte <a href="/wiki/Fossil" title="Fossil">fossil</a>. Den omvandla havbotnen finst i dei såkalla <a href="/wiki/Ofiolitt" title="Ofiolitt">ofiolitt</a>-kompleksa, med <a href="/w/index.php?title=Sekvens_i_geologi&action=edit&redlink=1" class="new" title="Sekvens i geologi (sida finst ikkje)">sekvensar</a> med <a href="/wiki/Gabbro" title="Gabbro">gabbro</a>, tettstilte <a href="/wiki/Diabas" title="Diabas">diabasgangar</a>, <a href="/wiki/Putelava" title="Putelava">putelava</a> og omvandla djuphavssediment. Nokre av dei viktigaste <a href="/wiki/Kis" title="Kis">kisførekomstane</a> i landet finst i desse bergartane. </p> <div class="mw-heading mw-heading2"><h2 id="Kjelder">Kjelder</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=10" title="Endre bolk: Kjelder" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=10" title="Rediger kildekoden til seksjonen Kjelder"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="references-small"> <p><a rel="nofollow" class="external text" href="https://snl.no/ordovicium">«ordovicium»</a> av Inge Bryhni i <i><a href="/wiki/Store_norske_leksikon" title="Store norske leksikon">Store norske leksikon</a></i>, snl.no. </p> <hr /> <ul><li><i>Denne artikkelen bygger på «<a href="https://en.wikipedia.org/wiki/Ordovician" class="extiw" title="en:Ordovician">Ordovician</a>» frå <a href="https://en.wikipedia.org/wiki/Main_Page" class="extiw" title="en:Main Page">Wikipedia på engelsk</a>, den 20. august 2008.</i> <ul><li><i><a href="https://en.wikipedia.org/wiki/Main_Page" class="extiw" title="en:Main Page">Wikipedia på engelsk</a> oppgav desse kjeldene:</i></li></ul></li></ul> </div> <style data-mw-deduplicate="TemplateStyles:r3318915">.mw-parser-output .reflist{font-size:90%;margin-bottom:0.5em;list-style-type:decimal}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><a href="/wiki/Fil:Sauerstoffgehalt-1000mj.svg" title="Fil:Sauerstoffgehalt-1000mj.svg">Fil:Sauerstoffgehalt-1000mj.svg</a></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><a href="/wiki/Fil:Phanerozoic_Carbon_Dioxide.png" title="Fil:Phanerozoic Carbon Dioxide.png">Fil:Phanerozoic Carbon Dioxide.png</a></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><a href="/wiki/Fil:All_palaeotemps.png" title="Fil:All palaeotemps.png">Fil:All palaeotemps.png</a></span> </li> <li id="cite_note-Wellman2000-4"><span class="mw-cite-backlink"><a href="#cite_ref-Wellman2000_4-0">↑</a></span> <span class="reference-text"><cite class="citation journal">Wellman, C.H.; Gray, J. (2000). «The microfossil record of tidleg land plants». <i><a href="/w/index.php?title=Philosophical_Transactions_of_the_Royal_Society_B:_Biological_Sciences&action=edit&redlink=1" class="new" title="Philosophical Transactions of the Royal Society B: Biological Sciences (sida finst ikkje)">Phil. Trans. R. Soc. B</a></i> <b>355</b> (1398): 717–732. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1098%2Frstb.2000.0612">10.1098/rstb.2000.0612</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.atitle=The+microfossil+record+of+tidleg+land+plants&rft.au=Gray%2C+J.&rft.au=Wellman%2C+C.H.&rft.date=2000&rft.genre=article&rft.issue=1398&rft.jtitle=Phil.+Trans.+R.+Soc.+B&rft.pages=717-732&rft.volume=355&rft_id=info%3Adoi%2F10.1098%2Frstb.2000.0612&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Melott2006-5"><span class="mw-cite-backlink"><a href="#cite_ref-Melott2006_5-0">↑</a></span> <span class="reference-text"><cite class="citation journal">Melott, Adrian (2004). «Did a gamma-ray burst initiate the late Ordovician mass extinction?». <i>International Journal of Astrobiology</i> <b>3</b>: 55–61. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1017%2FS1473550404001910">10.1017/S1473550404001910</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.atitle=Did+a+gamma-ray+burst+initiate+the+late+Ordovician+mass+extinction%3F&rft.au=Melott%2C+Adrian&rft.date=2004&rft.genre=article&rft.jtitle=International+Journal+of+Astrobiology&rft.pages=55-61&rft.volume=3&rft_id=info%3Adoi%2F10.1017%2FS1473550404001910&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Dixon2001-6"><span class="mw-cite-backlink"><a href="#cite_ref-Dixon2001_6-0">↑</a></span> <span class="reference-text"><cite class="citation book">Dixon, Dougal (2001). <i>Atlas of Life on Earth</i>. New York: Barnes & Noble Books. s. 87. <a href="/wiki/International_Standard_Book_Number" class="mw-redirect" title="International Standard Book Number">ISBN</a> <a href="/wiki/Spesial:Bokkjelder/0760719578" title="Spesial:Bokkjelder/0760719578">0760719578</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.au=Dixon%2C+Dougal&rft.btitle=Atlas+of+Life+on+Earth&rft.date=2001&rft.genre=book&rft.isbn=0760719578&rft.pages=87&rft.place=New+York&rft.pub=Barnes+%26+Noble+Books&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Cooper1986-7"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Cooper1986_7-0">7,0</a></sup> <sup><a href="#cite_ref-Cooper1986_7-1">7,1</a></sup></span> <span class="reference-text"><cite class="citation book">Cooper, John D.; Miller, Richard H.; Patterson, Jacqueline (1986). <i>A Trip Through Time: Principles of Historical Geology</i>. Columbus: Merrill Publishing Company. s. 247, 255–259. <a href="/wiki/International_Standard_Book_Number" class="mw-redirect" title="International Standard Book Number">ISBN</a> <a href="/wiki/Spesial:Bokkjelder/0675201403" title="Spesial:Bokkjelder/0675201403">0675201403</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.au=Cooper%2C+John+D.&rft.au=Miller%2C+Richard+H.&rft.au=Patterson%2C+Jacqueline&rft.btitle=A+Trip+Through+Time%3A+Principles+of+Historical+Geology&rft.date=1986&rft.genre=book&rft.isbn=0675201403&rft.pages=247%2C+255-259&rft.place=Columbus&rft.pub=Merrill+Publishing+Company&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-WilsonPalmer2006-8"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-WilsonPalmer2006_8-0">8,0</a></sup> <sup><a href="#cite_ref-WilsonPalmer2006_8-1">8,1</a></sup></span> <span class="reference-text"><cite class="citation journal">Wilson, M.A.; Palmer, T.J. (2006). <a rel="nofollow" class="external text" href="http://www.wooster.edu/geology/WilsonPalmer06.pdf">«Patterns and processes in the Ordovician Bioerosion Revolution»</a> <span style="font-size:85%;">(PDF)</span>. <i>Ichnos</i> <b>13</b>: 109–112. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1080%2F10420940600850505">10.1080/10420940600850505</a><span class="reference-accessdate">. Henta 20. august 2008</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.atitle=Patterns+and+processes+in+the+Ordovician+Bioerosion+Revolution&rft.au=Palmer%2C+T.J.&rft.au=Wilson%2C+M.A.&rft.date=2006&rft.genre=article&rft.jtitle=Ichnos&rft.pages=109-112&rft.volume=13&rft_id=http%3A%2F%2Fwww.wooster.edu%2Fgeology%2FWilsonPalmer06.pdf&rft_id=info%3Adoi%2F10.1080%2F10420940600850505&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Palaeos.com-9"><span class="mw-cite-backlink"><a href="#cite_ref-Palaeos.com_9-0">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="http://www.palaeos.com/Paleozoic/Ordovician/Ordovician.htm#Life">«Palaeos Paleozoic : Ordovician : The Ordovician Period»</a>. 11. april 2002<span class="reference-accessdate">. Henta 20. august 2008</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.btitle=Palaeos+Paleozoic+%3A+Ordovician+%3A+The+Ordovician+Period&rft.genre=unknown&rft_id=http%3A%2F%2Fwww.palaeos.com%2FPaleozoic%2FOrdovician%2FOrdovician.htm%23Life&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><a href="#cite_ref-10">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.trilobites.info/">A Guide to the Orders of Trilobites</a></span> </li> <li id="cite_note-WilsonPalmer2001-11"><span class="mw-cite-backlink"><a href="#cite_ref-WilsonPalmer2001_11-0">↑</a></span> <span class="reference-text"><cite class="citation journal">Wilson, M. A.; Palmer, T.J. (2001). «Domiciles, not predatory borings: a simpler explanation of the holes in Ordovician shells analyzed by Kaplan and Baumiller, 2000». <i>Palaios</i> <b>16</b>: 524–525. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1669%2F0883-1351%282001%29016%26lt%3B0524%3ADNPBAS%26gt%3B2.0.CO%3B2">10.1669/0883-1351(2001)016&lt;0524:DNPBAS&gt;2.0.CO;2</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.atitle=Domiciles%2C+not+predatory+borings%3A+a+simpler+explanation+of+the+holes+in+Ordovician+shells+analyzed+by+Kaplan+and+Baumiller%2C+2000&rft.au=Palmer%2C+T.J.&rft.au=Wilson%2C+M.+A.&rft.date=2001&rft.genre=article&rft.jtitle=Palaios&rft.pages=524-525&rft.volume=16&rft_id=info%3Adoi%2F10.1669%2F0883-1351%282001%29016%26lt%3B0524%3ADNPBAS%26gt%3B2.0.CO%3B2&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><a href="#cite_ref-12">↑</a></span> <span class="reference-text"><cite class="citation journal">Redecker, D.; Kodner, R.; Graham, L.E. (2000). «Glomalean fungi from the Ordovician». <i>Science</i> <b>289</b> (5486): 1920–1921. <a href="/wiki/PubMed_Identifier" class="mw-redirect" title="PubMed Identifier">PMID</a> <a rel="nofollow" class="external text" href="//www.ncbi.nlm.nih.gov/pubmed/10988069">10988069</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1126%2Fscience.289.5486.1920">10.1126/science.289.5486.1920</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.atitle=Glomalean+fungi+from+the+Ordovician&rft.au=Graham%2C+L.E.&rft.au=Kodner%2C+R.&rft.au=Redecker%2C+D.&rft.date=2000&rft.genre=article&rft.issue=5486&rft.jtitle=Science&rft.pages=1920-1921&rft.volume=289&rft_id=info%3Adoi%2F10.1126%2Fscience.289.5486.1920&rft_id=info%3Apmid%2F10988069&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Stanley1999-13"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Stanley1999_13-0">13,0</a></sup> <sup><a href="#cite_ref-Stanley1999_13-1">13,1</a></sup> <sup><a href="#cite_ref-Stanley1999_13-2">13,2</a></sup></span> <span class="reference-text"><cite class="citation book">Stanley, Steven M. (1999). <i>Earth System History</i>. New York: W.H. Freeman and Company. s. 358, 360. <a href="/wiki/International_Standard_Book_Number" class="mw-redirect" title="International Standard Book Number">ISBN</a> <a href="/wiki/Spesial:Bokkjelder/0716728826" title="Spesial:Bokkjelder/0716728826">0716728826</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3AOrdovicium&rft.au=Stanley%2C+Steven+M.&rft.btitle=Earth+System+History&rft.date=1999&rft.genre=book&rft.isbn=0716728826&rft.pages=358%2C+360&rft.place=New+York&rft.pub=W.H.+Freeman+and+Company&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><a href="#cite_ref-14">↑</a></span> <span class="reference-text">Emiliani (1992), 491</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Bakgrunnsstoff">Bakgrunnsstoff</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Ordovicium&veaction=edit&section=11" title="Endre bolk: Bakgrunnsstoff" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Ordovicium&action=edit&section=11" title="Rediger kildekoden til seksjonen Bakgrunnsstoff"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.geo-lieven.com/erdzeitalter/ordovizium/ordovizium.htm">Døme på fossil frå ordovicium</a></li> <li><a rel="nofollow" class="external text" href="http://members.wri.com/jeffb/Fossils">Fossil frå den kjende Cincinnati-gruppa i ordovicium</a></li></ul> <table class="toccolours" style="margin-left:auto; margin-right:auto; text-align:center"> <tbody><tr> <th style="background:rgb(0,149,126); color:black;" colspan="3"><a class="mw-selflink selflink">Ordovicium</a> </th></tr> <tr> <th style="background:rgb(0,158,126); color:black;"><a href="/wiki/Tidleg_ordovicium" title="Tidleg ordovicium">Nedre/tidleg ordovicium</a> </th> <th style="background:rgb(71,179,147); color:black;"><a href="/wiki/Mellomordovicium" title="Mellomordovicium">Mellomordovicium</a> </th> <th style="background:rgb(141,200,170); color:black;"><a href="/wiki/Sein_ordovicium" title="Sein ordovicium">Øvre/sein ordovicium</a> </th></tr> <tr> <td style="background:rgb(0,158,126);color:black; text-align:center;font-size:90%;"><a href="/wiki/Tremadocium" title="Tremadocium">Tremadocium</a> | <a href="/wiki/Floium" title="Floium">Floium</a> </td> <td style="background:rgb(71,179,147);color:black; text-align:center;font-size:90%;"><a href="/w/index.php?title=Dappingium&action=edit&redlink=1" class="new" title="Dappingium (sida finst ikkje)">Dappingium</a> | <a href="/wiki/Darriwilium" title="Darriwilium">Darriwilium</a> </td> <td style="background:rgb(141,200,170);color:black; text-align:center;font-size:90%;"><a href="/w/index.php?title=Sandbium&action=edit&redlink=1" class="new" title="Sandbium (sida finst ikkje)">Sandbium</a> | <a href="/w/index.php?title=Katium&action=edit&redlink=1" class="new" title="Katium (sida finst ikkje)">Katium</a><br /><a href="/wiki/Hirnantium" title="Hirnantium">Hirnantium</a> </td></tr></tbody></table> <table class="toccolours" style="margin-left:auto; margin-right:auto;"> <tbody><tr> <th style="background:rgb(153,192,141);text-align:center;" colspan="6"><a href="/wiki/Paleozoikum" title="Paleozoikum">Paleozoikum</a> </th></tr> <tr> <th style="background:rgb(147,171,110);width:80px;text-align:center"><a href="/wiki/Kambrium" title="Kambrium">Kambrium</a> </th> <th style="background:rgb(0,149,126);width:80px;text-align:center;"><a class="mw-selflink selflink">Ordovicium</a> </th> <th style="background:rgb(179,225,182);width:80px;text-align:center;"><a href="/wiki/Silur" title="Silur">Silur</a> </th> <th style="background:rgb(211,160,80);width:80px;text-align:center;"><a href="/wiki/Devontida" title="Devontida">Devon</a> </th> <th style="background:rgb(111,175,176);width:80px;text-align:center;"><a href="/wiki/Karbontida" title="Karbontida">Karbon</a> </th> <th style="background:rgb(240,64,60);width:80px;text-align:center;"><a href="/wiki/Permtida" title="Permtida">Perm</a> </th></tr></tbody></table> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r3515230">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol 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