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Index fossil
01
a fossilized organism that is useful for dating and correlating the strata in which it is found, typically indicative of a particular time period in Earth's geological history
Example
The trilobite is an index fossil commonly used to date Paleozoic rock layers.
Geologists rely on index fossils to determine the relative age of sedimentary rock formations.
The presence of ammonite shells in a layer serves as an index fossil for the Jurassic period.
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