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Some of the scientists' favorite index fossils are trilobites, ammonites and scallop shells.
So, how exactly is an index fossil used for relative dating of rocks?
Well, let's go back to our surveyor, William Smith.
He was often presented with the problem of finding two different rock outcrops from two different periods.
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Back in 1793, there lived a land surveyor named William Smith.The upper layer had scallop fossils, and the lower layer had trilobites.
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