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Any kind of object clearly restricted to a specific point in the geologic column would do just fine.If green dice were found only in the middle Ordovician strata, they would make excellent "index fossils." Evolution should be seen as an explanation of the faunal succession, a succession which was worked out long before evolution dominated the scene.

In some parts of the world the Cretaceous is found deeper than is the Cambrian in other parts of the world.(Far from being a rubber stamp, radiometric dating would go on to revolutionize our understanding of the Precambrian.) Thus, it became possible to date strata directly from index fossils.Note that evolution has nothing to do with how the index fossils are used to date strata!One can hardly accuse these pioneers of evolutionary prejudice.Nearly a half-century would pass before Darwin's book, The Origin of Species, was published!

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