How is an index fossil useful to geologists in establishing the age of the rock layer in which they find it?
February 20th, 2023
Index are fossils from a known period of time. If a rock layer contains these fossils, we know that the rock must have formed during the time period from which the index fossil belongs.
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How is an index fossil useful to geologists in establishing the age of the rock layer in which they find it?
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