Assertion: extinction's cause | /r/HasProperty | postulated for the petm
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text: Not only would such a cause require the release of five times as much methane as postulated for the PETM, but would it also have to be reburied at an unrealistically high rate to account for the rapid increases in the 13C/12C ratio (episodes of high positive δ13C ) throughout the early Triassic before it was released again several times.