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Unformatted text preview: separated in space. Continents must have moved. (Fig. 18.5, pg. 517). Major stages of the split-up of continents: Pangaea formed in Permian (> 250 MyBP) and began to break up in the Triassic (200 MyBP). Laurasia and Gondwana separated at the Tethys seaway (135 MyBP). Tropical corals, sea grasses and mangroves are related in Americas and old world tropics reflecting earlier Tethyan distribution . Gondwana began to break up about 80 MyBP and the major continents were separated by late Cretaceous (65 MyBP). India smashed into Asia crating the Himalayas. As the continents separated vicariance events abounded and the fauna of various continents became increasingly Provincialized . The South American mammals had many unique forms with respect to the North American Fauna. Marsupials in Australian zone are distinct form of mammal....
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- Fall '10