Index-fossil meaning

The fossil remains of an organism that lived in a particular geologic age, used to identify or date the rock or rock layer in which it is found.
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Any fossil of wide geographical distribution and a short range in time, used to correlate and date rock strata and their associated fossils.
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The fossil remains of an organism that lived in a particular geologic age, used to identify or date the rock or rock layer in which it is found. The best type of index fossils are usually those of swimming or floating organisms that evolved quickly (and therefore did not cover a long span of geologic history) and were able to spread over large areas. Ammonites and graptolites are good index fossils.
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Any ancient remains of a plant or animal that lived during a specific geological period and that can be used to date the containing rocks.
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