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Many fossils are found only during certain periods in geologic time. Scientists use these index fossils to determine the relative ages of rock layers.
The diagram shows two examples of index fossils in Column I.
Column II was found in a different location.
The same index fossil found in Column I layer C is found in Column II layer D.


Many Fossils Are Found Only During Certain Periods In Geologic Time Scientists Use These Index Fossils To Determine The Relative Ages Of Rock Layers The Diagram class=