Working on fossiliferous strata in the mountains of western Italy,____ was first to work out____which is the fundamental way geologists know which bed is older in any sedimentary
sequence

Question

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Nicolaus Steno was the first to articulate the law of superposition, which states that in any undeformed sequence of sedimentary rocks, each layer is older than the one above and younger than the one below. This principle is a foundational concept for determining the relative ages of rock layers.

Working on Fossiliferous Strata in the Mountains of Western Italy,____