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storchak [24]
3 years ago
14

. To be an index fossil, a fossil must

Geography
1 answer:
Ket [755]3 years ago
3 0

Answer:

a. They must be present in a large geographic area.

Explanation:

Index fossils can be used to determine the age of a rock strata with great precision, but they must be scattered over a large geographic area to be able to be used reliable for this type of measurement. Index fossils typically indicate a certain type of paleoenvironment belonging to a very specific prehistoric period and their formation coincides with the age of the rock layer.

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