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5 Mass Extinctions
- Ordovician
- 25% to 50%
became extinct
- sea life (i.e. trilobites, brachiopods,
graptolites) drastically reduced in number
- 25% to 50%
became extinct
- Devonian
- 75% became extinct
- water bed dried up
- sea bed became
devoid of oxygen
- 75% became extinct
- Permian
- 96% became extinct
- "The Great Dying"
- 96% became extinct
- Triassic
- marine reptiles, some large amphibians, many
reef-building creatures, large numbers of
cephalopod mollusks died
- plants were not so badly affected
- marine reptiles, some large amphibians, many
reef-building creatures, large numbers of
cephalopod mollusks died
- Cretaceous
- K/T extinction
- death of dinosaurs, many
flowering plants, and last of
pterosaurs
- K/T extinction
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