https://www.livescience.com/one-of-earths-biggest-mass-extinctions-caused-by-rising-sea-levels-in-eerie-echo-of-today
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3/14/23 at 8:44pm
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Live Science
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JoAnna Wendel
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In samples of organic-rich black shale, scientists found evidence for oxygen depletion and hydrogen sulfide expansion in ancient seas.
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