Geologists use fossils in sedimentary rocks to assign their correct place in geologic history.

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Geologists use fossils as a tool to determine the age of sedimentary rocks and to establish the relative timing of events in Earth's history. This process is called biostratigraphy. Fossils can be used as markers to correlate rock layers between different regions, and to create a timeline that spans millions of years.

Geologists Use Fossils in Sedimentary Rocks to Assign Their Correct