E.T. Degens J.C. Hathaway 1969 <div class="panel-pane pane-highwire-panel-tabs-container article__body"><div class="pane-content"><div id="panels-ajax-tab-container-highwire_article_tabs" class="panels-ajax-tab-container" data-panels-ajax-tab-preloaded="jnl_sci_tab_art"><div class="panels-ajax-tab-wrap-jnl_sci_tab_art"><div class="panel-display panel-1col clearfix"><div class="panel-panel panel-col"><div><div class="panel-pane pane-highwire-markup"><div class="pane-content"><div class="highwire-markup"><div id="content-block-markup" data-highwire-cite-ref-tooltip-instance="highwire_reflinks_tooltip" data-highwire-glossary-tooltip-instance="highwire_reflinks_tooltip"><div class="article abstract-view "><div id="abstract-1" class="section abstract"><p id="p-1">In some calcium carbonate-bearing sandstones from the edge of the continental shelf off the northeast United States, the δC¹³<span>&nbsp;</span>range is from -30 and -60 per mil for both aragonite and high-magnesium calcite. The δC¹³<span>&nbsp;</span>of co-existing shells of<span>&nbsp;</span><i>Modiolus</i><span>&nbsp;</span>sp. is normal (+ 1.7 to -2.7 per mil). The δO¹⁸<span>&nbsp;</span>values of around + 3.5 per mil in all samples suggest deposition at temperatures around 0°C. Quaternary methane oxidized either chemically or microbiologically to carbon dioxide is the probable source of carbon in these carbonates.</p></div></div><span id="related-urls"></span></div></div></div></div></div></div></div></div></div></div></div> application/pdf 10.1126/science.165.3894.690 en AAAS Methane-derived marine carbonates of pleistocene age article