3 years ago

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

Biology

2 answers:

olganol [36]3 years ago

6 0

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

Explanation: Hope this helppssss!!! :)

nlexa [21]3 years ago

4 0

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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