7

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Author:
dmrobert86
ID:
144487
Filename:
7
Updated:
2012-03-28 21:49:18
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7
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  1. 65mya
    end of cambrian, extinction of dinosaurs K/T Boundary
  2. 90 mya
    late cretaceous, continents started breaking apart
  3. 245 mya
    triassic, synapsid to mammal evolution- Thrinaxodon
  4. adaptive radiation
    ecological niches left vacant by extinct taxa, molecular data suggest many mammal lineages had already evolved by the end of the cretaceous , but mammalian fossils are rare
  5. 3.5 MYA
    tertiary pilocene, global cooling of climate, north and south america joined by isthmus of panama
  6. bottleneck
    most individuals of a species are wiped out and a few survive
  7. 1.8 MYA
    Pleistocene epoch in quaternary peiod, 4 major ice ages
  8. bering land bridge
    major intercontinetal migrations of animals and of plants, allowed alaska and siberia to be connected and animals were able to pass from one continent to the other
  9. holocene in pleistocene
    10 KYA, modern period since last ice age

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