To correlate rock units over a large area or to correlate age-equivalent units of different composition, fossils and the principle of fossil succession must be used.

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Fossils and the principle of fossil succession are important tools for correlating rock units and age-equivalent units of different composition. This is because different types of fossils are characteristic of particular time intervals, allowing geologists to compare and match rock strata that are separated by distance or lithology. By examining the fossils found in different rock layers, geologists can create a timeline of Earth's history and use this to correlate rocks from different locations or of different composition.

To Correlate Rock Units Over a Large Area or to Correlate