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<!DOCTYPE html> <html lang="en"> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css"> <link href="//cdnjs.cloudflare.com/ajax/libs/pnotify/2.0.0/pnotify.all.min.css" rel="stylesheet"> <script src="//ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js" type="text/javascript"></script> <link rel="stylesheet" href="/public/classic_css/autocomplete.css"> <meta charset="UTF-8"> <title>PBDB Interval</title>    <script src="/public/classic_js/autocomplete.js"></script> <script language="javascript" type="text/javascript"> var acapp = new AutoCompleteObject("searchbox", "cls", "classic"); document.addEventListener("DOMContentLoaded", acapp.initialize, false); function NewTab(doclink) { window.open( doclink, "_blank"); } </script> <style> .navbar-brand img { margin-top: -12px; } </style> </head> <body> <style> .nav > li > a { padding-left: 15px; padding-right: 10px } </style> <nav class="navbar navbar-inverse navbar-static-top" style="background-color: #000000" role="navigation"> <div class="container">  <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#tgc-main-nav-collapse"> <span class="sr-only">Toggle navigation</span> MENU </button> <a class="navbar-brand" href="/"><img src="/public/images/logo_white.png" alt="PaleobioDB" title="PBDB Home"></a> </div> <div class="collapse navbar-collapse"> <ul class="nav navbar-nav"> <li><a href="/classic">Main Menu</a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">About</a> <ul class="dropdown-menu"> <li class="dropdown"><a onclick="NewTab('https://escholarship.org/content/qt6tm05630/qt6tm05630.pdf?t=s0797i')">User Guide</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vQPrlNL2sUTFbZAzZFs2Jhs4j-1h3RfAIFNl54JstnHfxhhRcjMGImGU4VRk89C9Er_kNEWj7NTAqaR/pub')">FAQ</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vSa6qptD9Ox02NoD3pD5XreK0lh9P0JCxsHo1cpwV5My7HPh77vLYy6zjOqLPo0Gy09DKbAK3x69yMr/pub')">Recent Changes</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vSMxYT8vGz-8UOZmwKyEgMfuSbbk52fW-oQDbUxdMwIMd8xjqaQvue_sJvvW5LewvPGC-aeQActioIL/pub')">Data Definitions</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vRGNLWHekf_Pi2tfxfJeGvIAR3S3Z9BT6apmPQ-AGQhCHm0YB7AAwvSDh8F0bmrgeTO9LsB4Yw5IVsn/pub')">People</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vTj4EvmyKBAMq-mbfa7_TFbZMyA-JCRJhAjiEY5IFjaiPcjBTPO1uU54iefy_OxalV188qbKa2FZP8c/pub')">Funding</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vR7kG-nphQsmxW2tHX3yZkuahsZfQyXb3-5d8k088LDxwMM0RYlFbXM-m6ERWgm-bCNx8JKtiDsHPvu/pub')">Project Development</a></li> <li><a onclick="NewTab('/#/publications')">Official Publications</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vTSim8NOagd9iBlfCHWofL-fH4hMfkHUqakfwryDT2VOBxoCYsSMbpDcUdjBb0996Xvv8Ka7m1lqgcP/pub')">Partner Organizations</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/178HwGVtA4--3SSFCN5Xx56P75BskCWCZVV_OHMVK0Ms/edit?usp=sharing')">Database Policies</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vSeDBiPU9fgkK44R49Nj2WyhquPKU0F3G0uH1ezl9gNNq3cRyGHPdEvjpNtnuVwnXgscmoWru4zKUmx/pub')">Grant Writing Assistance</a></li> <li><a onclick="NewTab('https://docs.google.com/document/d/e/2PACX-1vQtrCtdl_7wOzAgm90__urKxgIMWLxC1hdA5Qh0rLozrnXteObSSWdXaAd9jSuJWfScHBXFvGACI6z5/pub')">Contact Us</a></li> </ul> </li> <li><a href="/classic/displayDownloadGenerator">Download</a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Search<b class="caret"></b></a> <ul class="dropdown-menu"> <li><a href="/classic/displaySearchColls?type=view">Fossil collection records</a></li> <li><a href="/classic/beginTaxonInfo">Fossil organisms</a></li> <li><a href="/classic/app/refs">Published references</a></li> <li><a href="/classic/classificationForm">Classifications of taxa in groups</a></li> <li><a href="/classic/displaySearchStrataForm">Stratigraphic units</a></li> <li><a href="/classic/app/archive/list">Data archives</a></li> </ul> </li> </ul> <ul class="nav navbar-nav navbar-right"> <li><a href="/account">Login</a></li> </ul> <form class="navbar-form navbar-input-group form-search universalSearchForm" onsubmit="return acapp.do_submit(this)"> <div class="input-group" id="acinput"> <input type="text" class="form-control" placeholder="Search the database" id="searchbox" onkeyup="acapp.do_keyup()"> <div class="searchResult dropdown-menu" style="display: none;"></div> </div> </form> </div> </div> </nav> <script language="javascript"> document.body.addEventListener("click", function (e) { acapp.showhide_menu(e); }); </script> <link rel="stylesheet" type="text/css" href="/public/classic_css/common.css">   <script src="/public/classic_js/common.js" language="JavaScript" type="text/javascript"></script> <div class="container"> <div id="mainBody"> <div class="innerMainPanel">  <link rel="stylesheet" href="/public/classic_css/timescales.css"> <script src="/public/classic_js/timescales.js"></script> <div onclick="closeDetails()"> <h3 class="ts_heading">Tremadoc <span class="ts_type">epoch</span></h3> <div id="details" class="ts_details"><p>485 - 477.7 Ma</p> <p>The definition of this interval in the timescale <a href="/classic/displayTimescale?scale=178">Ordovician of Britain</a> is taken from the following source:</p> <ul><li>F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. <i>Geologic Time Scale 2020</i> <a href="/classic/displayRefResults?reference_no=87642" target="_blank">view</a></li></ul> <p>The bottom age has been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.</p> <p>There are intervals in 8 timescales which overlap this one. <a onclick="showOverlapList()">show</a></p> <ul class="ts_ovlist" id="ts_ovlist" style="display: none"> <li><em>International Chronostratigraphic Timescale:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Early Ordovician">Early Ordovician</a> epoch, <a href="/classic/displayTimescale?interval=Tremadoc,Tremadocian">Tremadocian</a> age</li> <li><em>Ordovician of Britain:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Cressagian">Cressagian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Migneintian">Migneintian</a> age</li> <li><em>Ordovician of the Baltic:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Varangu">Varangu</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Hunneberg">Hunneberg</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Pakerort">Pakerort</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Oeland">Oeland</a> epoch, <a href="/classic/displayTimescale?interval=Tremadoc,Latorp">Latorp</a> age</li> <li><em>Ordovician of Australia:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Warendian">Warendian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Lancefieldian">Lancefieldian</a> age</li> <li><em>Ordovician of China:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Ningkuo">Ningkuo</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Hunjiang">Hunjiang</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Lianghekou">Lianghekou</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Dawan">Dawan</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Daobaowan">Daobaowan</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Xinchangian">Xinchangian</a> age</li> <li><em>Ordovician of North America:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Jeffersonian">Jeffersonian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Canadian">Canadian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Stairsian">Stairsian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Tulean">Tulean</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Cassinian">Cassinian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Demingian">Demingian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Gasconadian">Gasconadian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Skullrockian">Skullrockian</a> age, <a href="/classic/displayTimescale?interval=Tremadoc,Ibexian">Ibexian</a> epoch</li> <li><em>Cambrian of Siberia:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Mansian">Mansian</a> age</li> <li><em>Cambrian of Kazakhstan:</em> <a href="/classic/displayTimescale?interval=Tremadoc,Ungurian">Ungurian</a> age</li> </ul> <p>This interval is used in the definition of <a href="/classic/displayCollResults?view=standard&timerule=defined&max_interval=Tremadoc" target="_blank">831 collections</a></p> <p>A total of <a href="/classic/displayCollResults?view=standard&timerule=major&max_interval=Tremadoc" target="_blank">1698 collections</a> with 7848 occurrences lie within this time span</p> <table><tr><td><p><a class="ts_expand" href="/classic/displayTimescale?interval=68&show=Phanerozoic">Show more time</a></p> </td><td><p><a class="ts_expand" id="ts_showtime" onclick="toggleTime()">Show linear time</a></p> </td></tr></table> </div> <div id="diagram" class="ts_panel"> <table class="ts_display" id="ts_diagram" onclick="selectInterval(event)"> <tr><th class="ts_header" colspan="3">International Chronostratigraphic Timescale</th><th class="ts_header" colspan="4">Ordovician of Britain</th><th class="ts_corner"></th></tr> <tr><td class="ts_interval" style="background-color: #009270" rowspan="22" id="s1-21">Ordovician</td><td class="ts_interval" style="background-color: #7FCA93" rowspan="13" id="s1-29">Late Ordovician</td><td class="ts_interval" style="background-color: #A6DBAB" id="s1-192">Hirnantian</td><td class="ts_interval" style="background-color: #FFFF33" rowspan="4" id="s178-63">Ashgill</td><td class="ts_interval" style="background-color: #FFFF4D" id="s178-192">Hirnantian</td><td class="ts_empty" rowspan="4"></td><td class="ts_empty" rowspan="9"></td><td class="ts_bound" id="b0"><span class="ts_boundlabel">443.8</span></td></tr> <tr><td class="ts_interval" style="background-color: #99D69F" rowspan="6" id="s1-1008">Katian</td><td class="ts_interval" style="background-color: #FFFF4D" id="s178-193">Rawtheyan</td><td class="ts_bound" id="b1"><span class="ts_boundlabel">445.2</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" id="s178-194">Cautleyan</td><td class="ts_bound" id="b2"><span class="ts_boundlabel">448.9 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" id="s178-195">Pusgillian</td><td class="ts_bound" id="b3"><span class="ts_boundlabel">449.3 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF33" rowspan="9" id="s178-64">Caradoc</td><td class="ts_interval" style="background-color: #FFFF4D" id="s178-577">Streffordian</td><td class="ts_interval" style="background-color: #FFFF59" rowspan="4" id="s178-196">Onnian &dagger;</td><td class="ts_bound" id="b4"><span class="ts_boundlabel">449.6 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" id="s178-578">Cheneyan</td><td class="ts_bound" id="b5"><span class="ts_boundlabel">451.5 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" rowspan="5" id="s178-579">Burrellian</td><td class="ts_bound" id="b6"><span class="ts_boundlabel">452.7 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #8CD094" rowspan="6" id="s1-1009">Sandbian</td><td class="ts_bound" id="b7"><span class="ts_boundlabel">453</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF59" id="s178-197">Actonian &dagger;</td><td class="ts_bound" id="b8"><span class="ts_boundlabel">453.2 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF59" id="s178-198">Marshbrookian &dagger;</td><td class="ts_interval" style="background-color: #FFFF66" rowspan="3" id="s178-588">Woolstonian &dagger;</td><td class="ts_bound" id="b9"><span class="ts_boundlabel">454.2 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF59" rowspan="2" id="s178-199">Longvillian &dagger;</td><td class="ts_bound" id="b10"><span class="ts_boundlabel">455.2 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" rowspan="2" id="s178-580">Aurelucian</td><td class="ts_bound" id="b11"><span class="ts_boundlabel">456.8 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF59" id="s178-200+s178-201+s178-202">Soudleyan &dagger;/Harnagian/Costonian</td><td class="ts_empty" rowspan="10"></td><td class="ts_bound" id="b12"><span class="ts_boundlabel">457.4 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #4DB47E" rowspan="4" id="s1-30">Middle Ordovician</td><td class="ts_interval" style="background-color: #74C69C" rowspan="2" id="s1-556">Darriwilian</td><td class="ts_interval" style="background-color: #FFFF33" rowspan="3" id="s178-66">Llanvirn</td><td class="ts_interval" style="background-color: #FFFF4D" id="s178-581+s178-65+s178-203+s178-204+s178-205+s178-206">Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn</td><td class="ts_empty" rowspan="9"></td><td class="ts_bound" id="b13"><span class="ts_boundlabel">458.4</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" rowspan="2" id="s178-582+s178-207">Abereiddian/Early Llanvirn</td><td class="ts_bound" id="b14"><span class="ts_boundlabel">461.3 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #66C092" rowspan="2" id="s1-1079">Dapingian</td><td class="ts_bound" id="b15"><span class="ts_boundlabel">467.3</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF33" rowspan="4" id="s178-67">Arenig</td><td class="ts_interval" style="background-color: #FFFF4D" rowspan="2" id="s178-583">Fennian</td><td class="ts_bound" id="b16"><span class="ts_boundlabel">468.4 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #1A9D6F" rowspan="5" id="s1-31">Early Ordovician</td><td class="ts_interval" style="background-color: #41B087" rowspan="3" id="s1-1010">Floian</td><td class="ts_bound" id="b17"><span class="ts_boundlabel">470</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" id="s178-584">Whitlandian</td><td class="ts_bound" id="b18"><span class="ts_boundlabel">471.1 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" id="s178-585">Moridunian</td><td class="ts_bound" id="b19"><span class="ts_boundlabel">474.3 *</span></td></tr> <tr><td class="ts_interval" style="background-color: #33A97E" rowspan="2" id="s1-559">Tremadocian</td><td class="ts_interval ts_highlight" style="background-color: #FFFF33" rowspan="2" id="s178-68">Tremadoc</td><td class="ts_interval" style="background-color: #FFFF4D" id="s178-586">Migneintian</td><td class="ts_bound" id="b20"><span class="ts_boundlabel">477.7</span></td></tr> <tr><td class="ts_interval" style="background-color: #FFFF4D" id="s178-587">Cressagian</td><td class="ts_bound" id="b21"><span class="ts_boundlabel">480.8 *</span></td></tr> <tr><td class="ts_bottom" colspan="7"></td><td class="ts_bound" id="b22"><span class="ts_lastlabel">485 *</span></td></tr> </table> <div id="int_details" class="int_details" style="display: none"> Interval details </div> </div> </div> <script language="javascript"> intl_scale = 1; bin_scale = 10; interval_data = {"s178-579":{"t_ref":"452.5","nmo":19747,"n_colls":50,"b_type":"interpolated","interval_name":"Burrellian","type":"age","reference_no":87642,"t_age":"452.7","interval_no":579,"scale_no":178,"b_age":"456.8","b_ref":"456.6","t_type":"interpolated","nmc":2260} ,"s1-29":{"reference_no":87596,"t_age":"443.8","interval_no":29,"color":"#7FCA93","type":"epoch","b_type":"anchor","interval_name":"Late Ordovician","t_ref":"443.8","nmo":72425,"n_colls":610,"nmc":9924,"t_type":"anchor","b_ref":"458.4","parent_no":21,"b_age":"458.4","scale_no":1} 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