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Index Fossil (Noun)

Meaning

A fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found.

Classification

Nouns denoting natural objects (not man-made).

Examples

  • Trilobites are often used as index fossils to date the rock layers of the Paleozoic Era.
  • The discovery of the ammonite index fossil in the rock layer helped geologists determine its age.
  • Index fossils like brachiopods are essential in correlating rock layers across different regions.
  • The presence of the graptolite index fossil in the shale layer indicated that it was from the Ordovician Period.
  • By identifying the index fossil of a specific species of coral, scientists were able to date the limestone rock layer.

Synonyms

  • Guide Fossil
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