guide fossil

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Definitions from WordNet

Noun guide fossil has 1 sense

index fossil, guide fossil - 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
--₁ is a kind of fossil

Definitions from the Web

Guide Fossil

A guide fossil, also known as an index fossil, refers to a well-recognized and widely distributed fossil species that is used to determine the age of the rocks in which it is found. These fossils are particularly useful in correlating and dating geological strata.

Sample sentences:

The trilobite is considered a guide fossil for the Cambrian period.
Scientists rely on guide fossils to establish a relative timeline of Earth's history.
The discovery of a guide fossil in the sedimentary layers confirmed the age of the rock formation.

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