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Geologists utilize the principles of stratigraphy, particularly the Law of Superposition and the Principle of Faunal Succession, to compare the timing of the origin and extinction of life forms. The Law of Superposition states that in undisturbed sedimentary rock layers, older layers are found below younger ones, allowing geologists to establish a relative timeline. The Principle of Faunal Succession asserts that specific fossil groups follow a distinct chronological order, enabling scientists to correlate the age of rock layers with the presence of particular life forms. These principles together help in dating both the emergence and disappearance of species in the geological record.

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