- The fossil remains of an organism that lived-in a certain geologic age, regularly recognize or date the stone or rock level for which it really is discovered. Also referred to as guide fossil.
- Any ancient stays of a plant or animal that lived during a certain geological period and that can be used to time the containing stones.
- a fossil proven to have lived in a particular geologic age you can use currently the stone level for which its found
Hypernym for "index fossil"
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