An index fossil is a fossil from a very short-lived, geographically widespread species known to exist during a specific interval of geologic time.

Name: An index fossil is a fossil from a very short-lived, geographically widespread species known to exist during a specific interval of geologic time.
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This is the definition of an index fossil. It is used to help determine the age of rock layers in which it is found.

An Index Fossil Is a Fossil from a Very Short-Lived