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<p>in modern marine sedimentary environments such as <a href="page.php?w=wikt%3Astratified">stratified</a> inland seas, continental shelves, <a href="page.php?w=Organic-rich_sedimentary_rocks">organic-rich</a> deltas, and hydrothermal sediments which have intense microbial sulfate reduction because of the high concentration of dissolved sulfate in the seawater. Additionally, the high amounts of hydrogen sulfide found in oil and gas fields is thought to arise from the oxidation of petroleum hydrocarbons by sulfate. Such reactions are known to occur</p><p>
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