The "Big Five" Extinctions

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Author:
chanchan27104
ID:
288686
Filename:
The "Big Five" Extinctions
Updated:
2014-11-09 14:23:49
Tags:
biology
Folders:
BIO 181 Exam III
Description:
Extinction
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  1. End of Cretaceous
    • 47% of marine genera, 18% of land vertebrate families
    • Asteroid Impact
    • 65 million years ago
  2. End of Triassic
    • 52% of marine genera
    • Lava from central Atlantic province
    • Circa 199 million years ago
  3. End of Permian
    • 95% of all species extinct
    • Cause controversial
    • Circa 251 million years ago
  4. End of Devonian
    • 57% of marine genera
    • Cause unknown
    • Circa 354 million years ago
  5. Ordovician-Silurian
    • 60% of marine genera
    • Sea level changes due to glaciation
    • 439 million years ago

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