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Mass Extinctions

Mass extinction notes

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Page 1: Mass extinction notes

Mass Extinctions

Page 2: Mass extinction notes

things to note about Extinction

• Mass extinction vs. background extinction

• † (dagger symbol) next to a name indicates that organism is extinct

Tyrannosaurus rex†• Average “lifespan” of species

Page 3: Mass extinction notes
Page 4: Mass extinction notes

End Ordovician

• 445 mya• Intense glacial activity• Sea level changes• Circulation & weather

disruptions• 85%, but no major

groups

Page 5: Mass extinction notes

Late Devonian

• 376 mya• Global cooling• 70-82% gone

Page 6: Mass extinction notes

End Permian (Permo-Triassic)

• 250 mya• 90-95% eliminated

Page 7: Mass extinction notes

End Triassic

• 200 mya• 76% gone

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K/T• 65 mya• 60% lost

Page 9: Mass extinction notes

A final thought…

Approximately 99.99% of everything that has ever lived on Earth, over the past 3.6 billion

years, is now extinct.