Dictionary of Human Evolution and Biology

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Superposition Of Strata, Rule Or Law Of

One of the principles or rules in geology, which states that (usually) a sedimentary layer that is currently situated below another such layer, is older than the layer(s) above it. This principle assumes that gravity has always operated in the same way that it does today, and that it would be unlikely therefore that a complete sedimentary layer (or volcanic layer) to be inserted between two preexisting geological strata. first proposed by N. Steno.

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