Why are the best index fossils from species that only existed for a short period of time ?

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asked Feb 17, 2022 40.9k views

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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.

Explanation: Hope this helppssss!!! :)

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.

Why are the best index fossils from species that only existed for a short period of time ?

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