https://epsci.ucr.edu/ en https://epsci.ucr.edu/news/2011/01/06/oxygens-challenge-early-life <span>Oxygen's challenge to early life</span> <span><span>Anonymous (not verified)</span></span> <span><time datetime="2018-08-13T10:38:34-07:00" title="Monday, August 13, 2018 - 10:38">Mon, 08/13/2018 - 10:38</time> </span> <a href="https://epsci.ucr.edu/news">More News</a> <time datetime="2011-01-06T12:00:00Z">January 06, 2011</time> Riverside, Ca <p>"The conventional view of the history of the Earth is that the oceans became oxygen-rich to approximately the degree they are today in the Late Ediacaran Period (about 600 million years ago) after staying relatively oxygen-poor for the preceding four billion years.&nbsp;</p> <p>But biogeochemists at the University of California, Riverside have found evidence that shows that the ocean went back to being “anoxic” or oxygen-poor around 499 million years ago, soon after the first appearance of animals on the planet, and remained anoxic for 2-4 million years. What’s more, the researchers suggest that such anoxic conditions may have been commonplace over a much broader interval of time, with their data capturing a particularly good example."</p> <p><a class="btn-ucr" href="http://newsroom.ucr.edu/news_item.html?action=page&amp;id=2517" target="_blank">Read More</a></p> <a href="https://epsci.ucr.edu/article-category/sedimentary-geochemistry-organic-geochemistry" hreflang="en">Sedimentary Geochemistry &amp; Organic Geochemistry</a>, <a href="https://epsci.ucr.edu/article-category/global-climate-environmental-change" hreflang="en">Global Climate &amp; Environmental Change</a><div class="tags-title">Tags</div> <div class="tags-list"> <div><a href="https://epsci.ucr.edu/tags/timothy-lyons" hreflang="en">Timothy Lyons</a></div> <div><a href="https://epsci.ucr.edu/tags/benjamin-gill" hreflang="en">Benjamin Gill</a></div> </div> <div class="sharing-title">Share This</div><span class="a2a_kit a2a_kit_size_32 addtoany_list" data-a2a-url="https://epsci.ucr.edu/news/2011/01/06/oxygens-challenge-early-life" data-a2a-title="Oxygen's challenge to early life"><a class="a2a_button_facebook"></a><a class="a2a_button_x"></a><a class="a2a_button_linkedin"></a><a class="a2a_button_google_plus"></a><a class="a2a_button_email"></a><a class="a2a_button_printfriendly"></a><a class="a2a_dd addtoany_share" aria-label="more options to share" href="https://www.addtoany.com/share#url=https%3A%2F%2Fepsci.ucr.edu%2Fnews%2F2011%2F01%2F06%2Foxygens-challenge-early-life&amp;title=Oxygen%27s%20challenge%20to%20early%20life"></a></span><script> (function () { const customClassName = 'show-for-sr'; const targetContainer = document.querySelector('.a2a_kit.addtoany_list'); if (!targetContainer) return; const addClassToLabels = () => { const labels = targetContainer.querySelectorAll('.a2a_label'); if (labels.length > 0) { labels.forEach(label => { if (!label.classList.contains(customClassName)) { label.classList.add(customClassName); } }); console.log('Successfully applied show-for-sr class to AddToAny labels.'); return true; } return false; }; const observerConfig = { childList: true, subtree: true }; const observer = new MutationObserver((mutationsList, observer) => { if (addClassToLabels()) { observer.disconnect(); } }); if (!addClassToLabels()) { observer.observe(targetContainer, observerConfig); } })(); </script> Mon, 13 Aug 2018 17:38:34 +0000 Anonymous 116 at https://epsci.ucr.edu