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Older, more primitive (basal) forms tend to be buried in deeper strata. Certain common species are unique to particular strata, serving as useful "index" species.

Biogeographical evidence also supports Darwin's theory. There are common fossils in Africa and South America from before the split of the continents, but not so much afterwards. Australia has been separated from the other continents for eons, and all native mammal species there were marsupials--save for a few species of bat and rat. The dingo does not predate the arrival of Australian aborigines.

One more interesting bit of geological evidence--flowering plants are virtually absent from mesozoic, paleozoic, and earlier geologic strata. Dinosaur fossils are absent from cenozoic strata. The deep back in geologic time one delves, the fewer examples one finds of modern species, and the greater abundance one finds of species no longer extent.

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