Definition of index fossil in English:

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index fossil

noun

Geology
A fossil that is useful for dating and correlating the strata in which it is found.
Example sentences
  • This ‘dating’ is based on the presence of the ammonite index fossil Dactylioceras tenuicostatum.
  • Possibly the species will prove to be an index fossil for the lower Frasnian and uppermost Givetian of the Sauerland and the Maider in Morocco, ‘Ait Ou Amar’.
  • Stratigraphic occurrences of Carcineretes in the Caribbean Province suggest that this crab should be regarded as an index fossil for the early Maastrichtian.

For editors and proofreaders

Syllabification: in·dex fos·sil

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