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How are rock layers used to estimate the age of fossils?

Answer and explanation

Correct answer: Fossils in lower layers are generally considered older

The governing concept is the law of superposition, which is used for relative dating. In an undisturbed sequence of sedimentary rocks, newer material is deposited above older material. Therefore, fossils in lower layers are generally older than fossils in upper layers. This does not give an exact numerical age, and folding or disturbance may alter the order; hence “always” makes option A incorrect.

Related tags

FossilsRelative-DatingRock-LayersEvolutionHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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