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src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/DishStructureTalara.jpg/300px-DishStructureTalara.jpg" decoding="async" width="300" height="205" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/DishStructureTalara.jpg/450px-DishStructureTalara.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3c/DishStructureTalara.jpg/600px-DishStructureTalara.jpg 2x" data-file-width="1200" data-file-height="820" /></a><figcaption>Layers S1-S3 in a high-density turbidite exposed near <a href="/wiki/Talara" title="Talara">Talara</a>, <a href="/wiki/Peru" title="Peru">Peru</a></figcaption></figure> <p>The <b>Lowe sequence</b> describes a set of <a href="/wiki/Sedimentary_structure" class="mw-redirect" title="Sedimentary structure">sedimentary structures</a> in <a href="/wiki/Turbidite" title="Turbidite">turbidite</a> <a href="/wiki/Sandstone" title="Sandstone">sandstone</a> beds that are deposited by high-density <a href="/wiki/Turbidity_current" title="Turbidity current">turbidity currents</a>. It is intended to complement, not replace, the better known <a href="/wiki/Bouma_sequence" title="Bouma sequence">Bouma sequence</a>, which applies primarily to turbidites deposited by low-density (i.e., low-sand concentration), turbidity currents. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Description">Description</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lowe_sequence&action=edit&section=1" title="Edit section: Description"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Lowe sequence adds three layers labelled S1 through S3 to Bouma's terminology, with S1 being at the bottom and S3 at the top of a sandy turbidite bed. As with the Bouma sequence, each layer has a specific set of <a href="/wiki/Sedimentary_structures" title="Sedimentary structures">sedimentary structures</a> and <a href="/wiki/Lithology" title="Lithology">lithology</a>. And like the Bouma sequence, the layers become finer grained from bottom to top.<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><sup id="cite_ref-lowe_2-0" class="reference"><a href="#cite_note-lowe-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>The layers are described as follows.<sup id="cite_ref-lowe_2-1" class="reference"><a href="#cite_note-lowe-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <ul><li>S3 - Massive to graded, fine- to coarse-grained sandstones that overlie the S2 layer represent deposition from a turbulent suspension. Sometimes dish structures and dewatering pipes are present. This layer is essentially the same as the Bouma A layer.</li> <li>S2 - Inverse (reverse) graded, fine- to coarse-grained sandstone layers that overlie the S1 layer represent deposition as traction carpets, where grain-to-grain collisions are an important process.</li> <li>S1 - Sandstone to conglomerate that are at the base of the turbidite and display parallel-laminated to cross-laminated beds that indicate <a href="/wiki/Traction_(geology)" title="Traction (geology)">traction</a> deposition, wherein the current moves grains, pebbles and large clasts by rolling and sliding them across the surface beneath the flow.</li></ul> <p>As previously mentioned, the Lowe sequence is intended to complement, not replace the Bouma sequence. Fine-grained turbidites resulting from low-density turbidity currents, in which the Bouma A through Bouma E terminology applies, are referred to in the Lowe classification as Ta through Te, in which the T acronym derives from "Traction". By contrast, because the S1-S3 terminology describes sand-rich turbidites deposited by high-density turbidity currents, the S acronym derives from "Sandstone". Lastly, R1-R3, which uses the same descriptive criteria as S1-S3, applies to conglomerates, wherein the R acronym derives from "Rubble". In practice, the S1-S3 terminology is widely used, Ta-Te, is used sometimes, and R1-R3 is seldom used. </p> <div class="mw-heading mw-heading2"><h2 id="Processes">Processes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lowe_sequence&action=edit&section=2" title="Edit section: Processes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Initially grains, pebbles and large clasts in a high-density turbidity current (i.e., a high-sand concentration flow), are moved by traction (rolling and sliding) to generate a coarse-grained to conglomeratic, parallel-laminated to cross-laminated S1 layer. However, as grains settle out and move closer together, grain-to-grain collisions begin to generate dispersive pressures that help prevent further settling. This results in smaller grains moving between larger grains and preferentially settling out beneath them. Thus, an inverse graded layer develops that is called a <i>traction carpet</i>, since it is thought to move as a single unit. At some point, the grains move close enough together that collisions no longer generate enough energy to keep the grains in suspension, and the entire layer <i>freezes</i> to create an S2 layer. This process can then repeat to create additional traction carpets.<sup id="cite_ref-lowe_2-2" class="reference"><a href="#cite_note-lowe-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>When grains move closer together and settle out, the water between them is displaced so that it can move upward into the flow, helping to keep grains above the traction carpets in suspension. Because the flow is in motion, this upward movement of fluid quickly becomes turbulent. When the energy of the flow drops low enough that it can no longer sustain turbulence, then the entire flow <i>freezes</i> to create the massive to normally graded S3 layer. Subsequent reworking of the top of this new deposit by overlying remnant currents, or by new currents unrelated to the original flow can create laminations that resemble the Bouma B layer. When reworking stops, suspension settling may deposit massive mudstone (Bouma E) directly on top of the laminated layer. Alternatively, if new sediment is introduced during this reworking phase, or if sediment is sufficiently remobilized and transported, then a more complete Bouma sequence may develop on top of the S3 layer.<sup id="cite_ref-lowe_2-3" class="reference"><a href="#cite_note-lowe-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <ul class="gallery mw-gallery-traditional" style="max-width: 1372px;"> <li class="gallerybox" style="width: 335px"> <div class="thumb" style="width: 330px; height: 230px;"><span typeof="mw:File"><a href="/wiki/File:De-watering_pipes,_Cozy_Delll_Fm.jpg" class="mw-file-description" title="De-watering pipes above the Lowe S3 layer of a high-density turbidite. Cozy Dell Formation, California."><img alt="De-watering pipes above the Lowe S3 layer of a high-density turbidite. Cozy Dell Formation, California." src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/De-watering_pipes%2C_Cozy_Delll_Fm.jpg/300px-De-watering_pipes%2C_Cozy_Delll_Fm.jpg" decoding="async" width="300" height="199" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/De-watering_pipes%2C_Cozy_Delll_Fm.jpg/450px-De-watering_pipes%2C_Cozy_Delll_Fm.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/De-watering_pipes%2C_Cozy_Delll_Fm.jpg/600px-De-watering_pipes%2C_Cozy_Delll_Fm.jpg 2x" data-file-width="1510" data-file-height="1000" /></a></span></div> <div class="gallerytext">De-watering pipes above the Lowe S3 layer of a high-density turbidite. <a href="/wiki/Cozy_Dell_Formation" class="mw-redirect" title="Cozy Dell Formation">Cozy Dell Formation</a>, <a href="/wiki/California" title="California">California</a>.</div> </li> <li class="gallerybox" style="width: 335px"> <div class="thumb" style="width: 330px; height: 230px;"><span typeof="mw:File"><a href="/wiki/File:Giant_shale_rip_up,_Cozy_Dell_Fm.jpg" class="mw-file-description" title="Giant shale rip-up clast in the Lowe S1 layer of a high-density turbidite. Cozy Dell Formation, California."><img alt="Giant shale rip-up clast in the Lowe S1 layer of a high-density turbidite. Cozy Dell Formation, California." src="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/Giant_shale_rip_up%2C_Cozy_Dell_Fm.jpg/300px-Giant_shale_rip_up%2C_Cozy_Dell_Fm.jpg" decoding="async" width="300" height="197" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/Giant_shale_rip_up%2C_Cozy_Dell_Fm.jpg/450px-Giant_shale_rip_up%2C_Cozy_Dell_Fm.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/da/Giant_shale_rip_up%2C_Cozy_Dell_Fm.jpg/600px-Giant_shale_rip_up%2C_Cozy_Dell_Fm.jpg 2x" data-file-width="1520" data-file-height="1000" /></a></span></div> <div class="gallerytext">Giant shale rip-up clast in the Lowe S1 layer of a high-density turbidite. Cozy Dell Formation, California.</div> </li> <li class="gallerybox" style="width: 335px"> <div class="thumb" style="width: 330px; height: 230px;"><span typeof="mw:File"><a href="/wiki/File:De-watering_dike,_Cozy_Dell_Fm.jpg" class="mw-file-description" title="De-watering dike associated with a high-density turbidite. Cozy Dell Formation, California."><img alt="De-watering dike associated with a high-density turbidite. Cozy Dell Formation, California." src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7d/De-watering_dike%2C_Cozy_Dell_Fm.jpg/300px-De-watering_dike%2C_Cozy_Dell_Fm.jpg" decoding="async" width="300" height="198" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7d/De-watering_dike%2C_Cozy_Dell_Fm.jpg/450px-De-watering_dike%2C_Cozy_Dell_Fm.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7d/De-watering_dike%2C_Cozy_Dell_Fm.jpg/600px-De-watering_dike%2C_Cozy_Dell_Fm.jpg 2x" data-file-width="1516" data-file-height="1000" /></a></span></div> <div class="gallerytext">De-watering dike associated with a high-density turbidite. Cozy Dell Formation, California.</div> </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=Lowe_sequence&action=edit&section=3" 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-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></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="CITEREFBouma,_Arnold_H.1962" class="citation book cs1">Bouma, Arnold H. (1962). <i>Sedimentology of some Flysch deposits: A graphic approach to facies interpretation</i>. Elsevier. p. 168.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Sedimentology+of+some+Flysch+deposits%3A+A+graphic+approach+to+facies+interpretation&rft.pages=168&rft.pub=Elsevier&rft.date=1962&rft.au=Bouma%2C+Arnold+H.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALowe+sequence" class="Z3988"></span></span> </li> <li id="cite_note-lowe-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-lowe_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-lowe_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-lowe_2-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-lowe_2-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFLowe,_D.R.1982" class="citation journal cs1">Lowe, D.R. (1982). "Sediment gravity flows: II. Depositional models with special reference to the deposits of high-density turbidity currents". <i>Journal of Sedimentology, Society of Economic Paleontologists and Mineralogists</i>: v. 52, p. 279-297.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Journal+of+Sedimentology%2C+Society+of+Economic+Paleontologists+and+Mineralogists&rft.atitle=Sediment+gravity+flows%3A+II.+Depositional+models+with+special+reference+to+the+deposits+of+high-density+turbidity+currents&rft.pages=v.+52%2C+p.+279-297&rft.date=1982&rft.au=Lowe%2C+D.R.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALowe+sequence" class="Z3988"></span></span> </li> </ol></div></div> <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=Lowe_sequence&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Turbidites" class="mw-redirect" title="Turbidites">Turbidites</a></li> <li><a href="/wiki/Turbidity_current" title="Turbidity current">Turbidity currents</a></li> <li><a href="/wiki/Sediment_gravity_flows" class="mw-redirect" title="Sediment gravity flows">Sediment gravity flows</a></li> <li><a href="/wiki/Bouma_sequence" title="Bouma sequence">Bouma sequence</a></li></ul>    </div><noscript><img src="https://auth.wikimedia.org/loginwiki/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Lowe_sequence&oldid=1267431979">https://en.wikipedia.org/w/index.php?title=Lowe_sequence&oldid=1267431979</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Sedimentary_structures" title="Category:Sedimentary structures">Sedimentary structures</a></li><li><a href="/wiki/Category:Geological_processes" title="Category:Geological processes">Geological processes</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 5 January 2025, at 02:23<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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