What geologic law/principle states that fossil organisms (fauna) changed and evolved in a definite, progressive way such that strata of specific ages can be recognized by the fossils they contain?

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The principle of fossil succession states that sedimentary rock layers contain fossilized flora and fauna, which succeed each other vertically in a specific, reliable order that can be identified over wide horizontal distances. This principle allows geologists to determine the relative ages of rocks based on the fossils they contain.

What Geologic Law/principle States That Fossil Organisms (Fauna) Changed and Evolved