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Dpoetzsch · Answer 1 · 2022-02-18T13:10:04+0000

Answer: Because once they were very common they disappeared after the mass extinction event.

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Arthur Corenzan · Answer 2 · 2022-02-20T21:50:54+0000

Answer:

Because once they were very common they disappeared after the mass extinction event. ... Many geologic periods were defined by events that made natural boundary to the period.

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