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April 10 Lecture April 10, 2012
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0.5 0.4 0.3 0.2 0.1 0.0 0.6
Paleozoic Mesozoic Cenozoic
PHANEROZOIC
Drop in sea level due to plate tectonics ~ 50% extinction of animals & plants
Prevalent theories – causes of Phanerozoic extinctions
Drop in sea level due to glaciation ~ 50% extinction
Volcanic activity, formation of the supercontinent 70 – 90% extinction
Central Atlantic magmatic activity, global warming,
atmospheric CO2 extinction Asteroid-induced,
supercontinent breakup 70-90% extinction
Anthropogenic
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