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11 Cards in this Set
- Front
- Back
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Tertiary and mammals |
Witness diversification of many mammalian and bird groups |
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Tertiary conditions |
Mostly tropical, continents isolated by shallow seas, allowed great diversity |
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Early Tertiary |
Dominant hold-overs from mass extinction replaced by well-adapted descendants |
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Eocene |
Mammals include giant and small brained rhinoceros types Huge flightless carnivorous birds |
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Late teritary |
Grasslands evolved, flowering plants Shrinkage of inland seas and plate movement creates land bridges |
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Significance of the evolution of grasslands |
Leads to evolution of long-legged animals with high-crowned teeth for chewing rough grass |
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Evolutionary trend of horses |
Longer legs, less digits, more complex teeth |
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Pliocene |
Great American biotic interchange - a land bridge between north and south america brought land animals into competition |
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Fauna that won in the pliocene |
Northern fauna |
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Significance of plate tectonics to diversity |
Pangaea initially split into supercontinents Laurasia and Gondwanaland, each developed their own type of mammals and split further Smaller continents came into contact, allowing interchange |
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Late Tertiary (Pleistocene) |
Initiation of last ice age, continent scale glaciation Still many forests and forest animals |
