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</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">From Wikipedia, the free encyclopedia</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="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Hardened layer of soil with a high percentage of gypsum</div> <p><b>Gypcrete</b> or <b>gypcrust</b> is a hardened layer of <a href="/wiki/Soil" title="Soil">soil</a>, consisting of around 95% <a href="/wiki/Gypsum" title="Gypsum">gypsum</a> (<a href="/wiki/Calcium_sulfate" title="Calcium sulfate">calcium sulfate</a>). Gypcrust is an arid zone <a href="/wiki/Duricrust" title="Duricrust">duricrust</a>.<sup id="cite_ref-Walker_1-0" class="reference"><a href="#cite_note-Walker-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It can also occur in a semiarid climate in a basin with internal drainage, and is initially developed in a playa as an evaporate.<sup id="cite_ref-Britannica_2-0" class="reference"><a href="#cite_note-Britannica-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Gypcrete is the arid climate's equivalent to <a href="/wiki/Calcrete" class="mw-redirect" title="Calcrete">calcrete</a>, which is a duricrust that is unable to generate in very arid climates.<sup id="cite_ref-Bell_3-0" class="reference"><a href="#cite_note-Bell-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Composition">Composition</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=1" title="Edit section: Composition"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Gypcrust horizons can be up to 5 m (16 ft) thick with a 75–97% gypsum (CaSO<sub>4</sub>∙2H<sub>2</sub>O) content. The majority of gypsum-rich layers occur where the average annual rainfall is less than 250 mm because gypsum is moderately soluble (c. 2.6 g<sup>−1</sup> at 25 °C) and is normally leached out under higher rainfall conditions. Gypsum cements are rarely, if ever, as strong as calcretes or silcretes.<sup id="cite_ref-Walker_1-1" class="reference"><a href="#cite_note-Walker-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Formation">Formation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=2" title="Edit section: Formation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Gypcrust forms in a manner similar to that of <a href="/wiki/Caliche_(mineral)" class="mw-redirect" title="Caliche (mineral)">caliche</a>, which is composed of <a href="/wiki/Calcium_carbonate" title="Calcium carbonate">calcium carbonate</a>. The development of gypcrust has three main stages. The first stage is primary crystallization of the surface brines or groundwater; the second stage is transportation and redeposition by wind or water; and the third stage is post-depositional alteration above or below the <a href="/wiki/Capillary_fringe" title="Capillary fringe">capillary fringe</a>. Most gypcrust is formed either as a result of soil-forming processes or through the precipitation of cementing agents from groundwater.<sup id="cite_ref-Walker_1-2" class="reference"><a href="#cite_note-Walker-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Influence_of_groundwater_on_the_formation_of_duricrusts">Influence of groundwater on the formation of duricrusts</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=3" title="Edit section: Influence of groundwater on the formation of duricrusts"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are two models that are used to illustrate the influence groundwater has on the formations of duricrusts like gypcrust: <i>per ascensum</i> and <i>per descensum</i>. The <i>per ascensum</i> model demonstrates a situation where the water table is relatively close to the surface, allowing solutions to be drawn upwards by evaporation and eventually cement near-surface sediments once they become concentrated enough to trigger precipitation. The <i>per ascensum</i> model is applicable to environments with high rates of surface evaporation like deserts. This type of system only produces thin duricrust layers since the process ultimately seals the surface horizons, which consequently decreases the potential for further evaporation. This model best depicts the formation of gypcrust. The <i>per descensum</i> model describes a system different from that of the formation of gypcrust in which precipitation of minerals occurs at a depth from downward-percolating solutions. This type of system explains the formation of thick duricrust horizons.<sup id="cite_ref-Walker_1-3" class="reference"><a href="#cite_note-Walker-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Conditions_for_formation">Conditions for formation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=4" title="Edit section: Conditions for formation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Gypcretes form in four distinct conditions: in well-drained soils, as buried evaporates, in hydromorphic soils, or by the exposure of subsurface horizons by erosion.<sup id="cite_ref-Walker_1-4" class="reference"><a href="#cite_note-Walker-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Profile">Profile</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=5" title="Edit section: Profile"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Gypcrete can be a loose and powdery deposit or a massive crystalline structure.<sup id="cite_ref-Britannica_2-1" class="reference"><a href="#cite_note-Britannica-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The profile of a gypcrust outcrop can have three layers. The bottom layer is the <a href="/wiki/Sand_rose" class="mw-redirect" title="Sand rose">sand rose</a> horizon at the water table where gypsum develops as <a href="/wiki/Aggregate_(geology)" title="Aggregate (geology)">aggregates</a> of crystals. The middle layer is composed of massive gypcrete cemented sand, which forms above the water table during evaporation from the capillary fringe; newly formed gypcrete will be hard, and will soften with age. The uppermost layer is usually rich in gypsified roots and has a banded or nodular structure.<sup id="cite_ref-Bell_3-1" class="reference"><a href="#cite_note-Bell-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Uses">Uses</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=6" title="Edit section: Uses"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Gypcrete has been used successfully for road construction in the Sahara.<sup id="cite_ref-Walker_1-5" class="reference"><a href="#cite_note-Walker-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Well-cemented gypcrusts may also provide adequate bearing capacity for structures; however, it must be ensured that the underlying uncemented material is not overloaded to avoid collapse.<sup id="cite_ref-Bell_3-2" class="reference"><a href="#cite_note-Bell-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Gypsum_flora_of_Nova_Scotia" title="Gypsum flora of Nova Scotia">Gypsum flora of Nova Scotia</a> – Group of plants in Nova Scotia, Canada</li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Gypcrust&action=edit&section=8" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.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"><ol class="references"> <li id="cite_note-Walker-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Walker_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Walker_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Walker_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Walker_1-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-Walker_1-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-Walker_1-5"><sup><i><b>f</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFWalker2012" class="citation book cs1">Walker, M.J. (2012). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=igeqMqSKkeAC&q=gypcrust+formation"><i>Hot Deserts: Engineering, Geology and Geomorphology: Engineering Group Working Day Report</i></a>. Geological Society of London. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9781862393424" title="Special:BookSources/9781862393424"><bdi>9781862393424</bdi></a><span class="reference-accessdate">. Retrieved <span class="nowrap">7 October</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Hot+Deserts%3A+Engineering%2C+Geology+and+Geomorphology%3A+Engineering+Group+Working+Day+Report&rft.pub=Geological+Society+of+London&rft.date=2012&rft.isbn=9781862393424&rft.aulast=Walker&rft.aufirst=M.J.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DigeqMqSKkeAC%26q%3Dgypcrust%2Bformation&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGypcrust" class="Z3988"></span></span> </li> <li id="cite_note-Britannica-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-Britannica_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Britannica_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBritannica" class="citation web cs1">Britannica, Encyclopedia. <a rel="nofollow" class="external text" href="http://www.britannica.com/EBchecked/topic/250383/gypcrete">"gypcrete"</a>. Encyclopædia Britannica, Inc<span class="reference-accessdate">. Retrieved <span class="nowrap">7 October</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=gypcrete&rft.pub=Encyclop%C3%A6dia+Britannica%2C+Inc&rft.aulast=Britannica&rft.aufirst=Encyclopedia&rft_id=http%3A%2F%2Fwww.britannica.com%2FEBchecked%2Ftopic%2F250383%2Fgypcrete&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGypcrust" class="Z3988"></span></span> </li> <li id="cite_note-Bell-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-Bell_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Bell_3-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Bell_3-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBell2002" class="citation book cs1">Bell, Fred G. (4 January 2002). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=eE_X-QnIQrYC&q=formation+of+gypcrust"><i>Geological Hazards: Their Assessment, Avoidance and Mitigation</i></a>. Taylor & Francis, 2002. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780203014660" title="Special:BookSources/9780203014660"><bdi>9780203014660</bdi></a><span class="reference-accessdate">. Retrieved <span class="nowrap">7 October</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Geological+Hazards%3A+Their+Assessment%2C+Avoidance+and+Mitigation&rft.pub=Taylor+%26+Francis%2C+2002&rft.date=2002-01-04&rft.isbn=9780203014660&rft.aulast=Bell&rft.aufirst=Fred+G.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DeE_X-QnIQrYC%26q%3Dformation%2Bof%2Bgypcrust&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGypcrust" class="Z3988"></span></span> </li> </ol></div></div> <p class="mw-empty-elt"> </p> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.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 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"}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Soil_type" title="Template:Soil type"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Soil_type" title="Template talk:Soil type"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Soil_type" title="Special:EditPage/Template:Soil type"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Soil_classification" style="font-size:114%;margin:0 4em"><a href="/wiki/Soil_classification" title="Soil classification">Soil classification</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/World_Reference_Base_for_Soil_Resources" title="World Reference Base for Soil Resources">World Reference Base<br /> for Soil Resources</a> (1998–)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acrisol" title="Acrisol">Acrisols</a></li> <li><a href="/wiki/Alisols" class="mw-redirect" title="Alisols">Alisols</a></li> <li><a href="/wiki/Andosol" title="Andosol">Andosols</a></li> <li><a href="/wiki/Anthrosol" title="Anthrosol">Anthrosols</a></li> <li><a href="/wiki/Psamment" title="Psamment">Arenosols</a></li> <li><a href="/wiki/Calcisol" title="Calcisol">Calcisols</a></li> <li><a href="/wiki/Cambisol" title="Cambisol">Cambisols</a></li> <li><a href="/wiki/Chernozem" title="Chernozem">Chernozem</a></li> <li><a href="/wiki/Cryosols" class="mw-redirect" title="Cryosols">Cryosols</a></li> <li><a href="/wiki/Durisol" title="Durisol">Durisols</a></li> <li><a href="/wiki/Ferralsols" class="mw-redirect" title="Ferralsols">Ferralsols</a></li> <li><a href="/wiki/Fluvisol" title="Fluvisol">Fluvisols</a></li> <li><a href="/wiki/Gleysol" title="Gleysol">Gleysols</a></li> <li><a href="/wiki/Gypsisols" class="mw-redirect" title="Gypsisols">Gypsisols</a></li> <li><a href="/wiki/Histosol" title="Histosol">Histosol</a></li> <li><a href="/wiki/Kastanozem" title="Kastanozem">Kastanozems</a></li> <li><a href="/wiki/Leptosol" title="Leptosol">Leptosols</a></li> <li><a href="/wiki/Lixisol" title="Lixisol">Lixisols</a></li> <li><a href="/wiki/Luvisol" title="Luvisol">Luvisols</a></li> <li><a href="/wiki/Nitisol" title="Nitisol">Nitisols</a></li> <li><a href="/wiki/Phaeozem" title="Phaeozem">Phaeozems</a></li> <li><a href="/wiki/Planosol" title="Planosol">Planosols</a></li> <li><a href="/wiki/Plinthosol" title="Plinthosol">Plinthosols</a></li> <li><a href="/wiki/Podzol" title="Podzol">Podzols</a></li> <li><a href="/wiki/Regosol" title="Regosol">Regosols</a></li> <li><a href="/wiki/Retisol" title="Retisol">Retisols</a></li> <li><a href="/wiki/Solonchak" title="Solonchak">Solonchaks</a></li> <li><a href="/wiki/Solonetz" title="Solonetz">Solonetz</a></li> <li><a href="/wiki/Stagnosol" title="Stagnosol">Stagnosol</a></li> <li><a href="/wiki/Technosol" title="Technosol">Technosols</a></li> <li><a href="/wiki/Umbrisol" title="Umbrisol">Umbrisols</a></li> <li><a href="/wiki/Vertisol" title="Vertisol">Vertisols</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/USDA_soil_taxonomy" title="USDA soil taxonomy">USDA soil taxonomy</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alfisol" title="Alfisol">Alfisols</a></li> <li><a href="/wiki/Andisol" title="Andisol">Andisols</a></li> <li><a href="/wiki/Aridisol" title="Aridisol">Aridisols</a></li> <li><a href="/wiki/Entisol" title="Entisol">Entisols</a></li> <li><a href="/wiki/Gelisol" title="Gelisol">Gelisols</a></li> <li><a href="/wiki/Histosol" title="Histosol">Histosols</a></li> <li><a href="/wiki/Inceptisol" title="Inceptisol">Inceptisols</a></li> <li><a href="/wiki/Mollisol" title="Mollisol">Mollisols</a></li> <li><a href="/wiki/Oxisol" title="Oxisol">Oxisols</a></li> <li><a href="/wiki/Podzol" title="Podzol">Spodosols</a></li> <li><a href="/wiki/Ultisol" title="Ultisol">Ultisols</a></li> <li><a href="/wiki/Vertisol" title="Vertisol">Vertisols</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other systems</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/FAO_soil_classification" title="FAO soil classification">FAO soil classification</a> (1974–1998)</li> <li><a href="/wiki/Unified_Soil_Classification_System" title="Unified Soil Classification System">Unified Soil Classification System</a></li> <li><a href="/wiki/AASHTO_Soil_Classification_System" title="AASHTO Soil Classification System">AASHTO Soil Classification System</a></li> <li><a href="/wiki/R%C3%A9f%C3%A9rentiel_p%C3%A9dologique" title="Référentiel pédologique">Référentiel pédologique</a> (French classification system)</li> <li><a href="/wiki/Canadian_system_of_soil_classification" title="Canadian system of soil classification">Canadian system of soil classification</a></li> <li><a href="/wiki/Australian_Soil_Classification" title="Australian Soil Classification">Australian Soil Classification</a></li> <li><a href="/wiki/Polish_Soil_Classification" title="Polish Soil Classification">Polish Soil Classification</a></li> <li><a href="/wiki/1938_USDA_soil_taxonomy" title="1938 USDA soil taxonomy">1938 USDA soil taxonomy</a></li> <li><a href="/wiki/List_of_U.S._state_soils" title="List of U.S. state soils">List of U.S. state soils</a></li> <li><a href="/wiki/List_of_vineyard_soil_types" title="List of vineyard soil types">List of vineyard soil types</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Non-systematic soil types</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sand" title="Sand">Sand</a></li> <li><a href="/wiki/Silt" title="Silt">Silt</a></li> <li><a href="/wiki/Clay" title="Clay">Clay</a></li> <li><a href="/wiki/Loam" title="Loam">Loam</a></li> <li><a href="/wiki/Topsoil" title="Topsoil">Topsoil</a></li> <li><a href="/wiki/Subsoil" title="Subsoil">Subsoil</a></li> <li><a href="/wiki/Soil_crust" title="Soil crust">Soil crust</a></li> <li><a href="/wiki/Claypan" title="Claypan">Claypan</a></li> <li><a href="/wiki/Hardpan" title="Hardpan">Hardpan</a></li> <li><a class="mw-selflink selflink">Gypcrust</a></li> <li><a href="/wiki/Caliche" title="Caliche">Caliche</a></li> <li><a href="/wiki/Parent_material" title="Parent material">Parent material</a></li> <li><a href="/wiki/Pedosphere" title="Pedosphere">Pedosphere</a></li> <li><a href="/wiki/Laimosphere" title="Laimosphere">Laimosphere</a></li> <li><a href="/wiki/Rhizosphere" title="Rhizosphere">Rhizosphere</a></li> <li><a href="/wiki/Bulk_soil" title="Bulk soil">Bulk soil</a></li> <li><a href="/wiki/Alkali_soil" title="Alkali soil">Alkali soil</a></li> <li><a href="/wiki/Bay_mud" title="Bay mud">Bay mud</a></li> <li><a href="/wiki/Blue_goo" title="Blue goo">Blue goo</a></li> <li><a href="/wiki/Brickearth" title="Brickearth">Brickearth</a></li> <li><a href="/wiki/Brown_earth" title="Brown earth">Brown earth</a></li> <li><a href="/wiki/Calcareous_grassland" title="Calcareous grassland">Calcareous grassland</a></li> <li><a href="/wiki/Dark_earth" title="Dark earth">Dark earth</a></li> <li><a href="/wiki/Dry_quicksand" title="Dry quicksand">Dry quicksand</a></li> <li><a href="/wiki/Duplex_soil" title="Duplex soil">Duplex soil</a></li> <li><a href="/wiki/Eluvium" title="Eluvium">Eluvium</a></li> <li><a href="/wiki/Expansive_clay" title="Expansive clay">Expansive clay</a></li> <li><a href="/wiki/Fill_dirt" title="Fill dirt">Fill dirt</a></li> <li><a href="/wiki/Fuller%27s_earth" title="Fuller's earth">Fuller's earth</a></li> <li><a href="/wiki/Hydrophobic_soil" title="Hydrophobic soil">Hydrophobic soil</a></li> <li><a href="/wiki/Loess" title="Loess">Loess</a></li> <li><a href="/wiki/Lunar_soil" class="mw-redirect" title="Lunar soil">Lunar soil</a></li> <li><a href="/wiki/Martian_soil" class="mw-redirect" title="Martian soil">Martian soil</a></li> <li><a href="/wiki/Mud" title="Mud">Mud</a></li> <li><a href="/wiki/Muskeg" title="Muskeg">Muskeg</a></li> <li><a href="/wiki/Paleosol" title="Paleosol">Paleosol</a></li> <li><a href="/wiki/Peat" title="Peat">Peat</a></li> <li><a href="/wiki/Prime_farmland" title="Prime farmland">Prime farmland</a></li> <li><a href="/wiki/Quicksand" title="Quicksand">Quicksand</a></li> <li><a href="/wiki/Serpentine_soil" title="Serpentine soil">Serpentine soil</a></li> <li><a href="/wiki/Spodic_soil" class="mw-redirect" title="Spodic soil">Spodic soil</a></li> <li><a href="/wiki/Stagnogley" title="Stagnogley">Stagnogley</a></li> <li><a href="/wiki/Subaqueous_soil" title="Subaqueous soil">Subaqueous soil</a></li> <li><a href="/wiki/Takir_(soil)" title="Takir (soil)">Takir</a></li> <li><a href="/wiki/Terra_preta" title="Terra preta">Terra preta</a></li> <li><a href="/wiki/Terra_rossa_(soil)" title="Terra rossa (soil)">Terra rossa</a></li> <li><a href="/wiki/Tropical_peat" title="Tropical peat">Tropical peat</a></li> <li><a href="/wiki/Yedoma" title="Yedoma">Yedoma</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Types_of_soil" title="Category:Types of soil">Types of soil</a></div></td></tr></tbody></table></div>   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