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stunna006 t1_j8l7y83 wrote

Reply to comment by [deleted] in During the mid-Cretaceous approximately 94.5 million years ago the worlds oceans became nearly uninhabitable as rapid degassing of volcanic carbon dioxide altered seawater carbonate chemistry, triggering a global-scale episode of reduced marine oxygen levels known as Oceanic Anoxic Event 2. by avogadros_number

Perhaps something to do with most fossils being land species, a large dropoff in marine species may not be as noticeable overall

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