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Answer:
index fossils are the ones that tell us the most.
Step-by-step explanation:
Index fossils (also called key fossils or type fossils) are those that are used to define periods of geologic time.
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Every fossil tells us something about the age of the rock it's found in, and index fossils are the ones that tell us the most. Index fossils (also called key fossils or type fossils) are those that are used to define periods of geologic time