08-0415 LECTURE.pdf
08-0415 LECTURE.pdf
08-0415 LECTURE.pdf
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MASS EXTINCTIONS<br />
Large number of species terminated<br />
Species terminated globally<br />
Extinctions happen over relatively short time<br />
period<br />
CONS<br />
Heavy species and family<br />
losses<br />
Long-term ecologic collapse<br />
The ‘One-Two’ Punch<br />
Low sea level<br />
Carbon cycle changes<br />
PROS<br />
Opportunity for mass<br />
evolutionary<br />
diversification<br />
Late Triassic Mass Extinction<br />
FEATURES<br />
2-phases?<br />
Sea level fall<br />
Effusive volcanism (central Atlantic magmatic province)<br />
2<strong>08</strong>-213 my<br />
Shocked quartz<br />
Widespread wildfires?<br />
24-45% of all families; 60-80% of all species?<br />
DINOSAUR EXPANSION<br />
CAUSES?<br />
Volcanism?<br />
Oceanographic changes?<br />
Asteroid impact?<br />
10
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