Past biogeography

Past biogeography - Past biogeography Past biogeography, as...

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Past biogeography Past biogeography, as recorded by the fossils that are found, must also conform to the standard phylogenetic tree. Example 1: marsupials As one example, we conclude that fossils of the hypothetical common ancestors of South American marsupials and Australian marsupials should be found dating from before these two landmasses separated. Confirmation: Consequently, we find the earliest marsupial fossils (e.g., Alphadon ) from the Late Cretaceous, when South America, Antarctica, and Australia were still connected. Additionally, the earliest ancestors of modern marsupials are actually found on North America. The obvious paleontological deduction is that extinct marsupials fossil organisms should be found on South America and Antarctica, since marsupials must have traversed these continents to reach their present day location in Australia. Interestingly, we have found marsupial fossils on both South America and on Antarctica. This is an astounding macroevolutionary confirmation, given that no marsupials live on Antarctica now (Woodburne and Case 1996 ). Potential Falsification: We confidently predict that fossils of recently evolved animals like apes and elephants should never be found on South America, Antarctica, or Australia (excepting, of course, the apes that travel by boat). Example 2: horses
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Past biogeography - Past biogeography Past biogeography, as...

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