index fossil

noun

Definition of index fossil

:a fossil usually with a narrow time range and wide spatial distribution that is used in the identification of related geologic formations

Recent Examples of index fossil from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'index fossil.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of index fossil

1900


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