GEOL 105L Lecture Notes - Lecture 10: Canine Tooth, Cenozoic, Dimetrodon
31 Mar 2020
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Lab 10: paleogeography and biodiversity in the cenozoic. Separate continents = more stable climate, wetter interior, more continental shelf. Central america connects n and s america. Analogous structures similar structures that appear in groups of organisms due to convergent evolution (unrelated organisms develop similar traits due to living in similar ecosystems or niches) Ancestors present of 3 main mammal groups of present day: After end cretaceous mass extinction (so remember, that is the end of the mesozoic): In 10my diversity exploded, w/ 130 genera (ex: whales, primates, rodents, bats) Adaptive radiation took place: expansion of species diversity into new ways of life. Flowering plants were dominant by end of the cretaceous, that = insects for mammals, and fruits and berries after the extinction. New forests =habitat for tree-dwelling mammals primates ~50myaeventually ~6mya hominids evolved. Continents were breaking up (that started ~200mya), and that increased mammalian diversity. Australia and south america were isolated in the beginning of the cenozoic.
