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Unformatted text preview: b. wolf creek crater (Australia) 300,000 years ago 3. Yucatan Meteor a. 65 million years ago b. 10 km in diameter c. crater 180 km in diameter d. 2,000 ft waves e. dust clouded sun for several months/years f. possibly caused mass extinction at end of Mesozoic IV. Mass Extinction A. Permian mass extinction 1. end of Paleozoic 2. 90% of all marine life many terrestrial 3. merge to form Pangaea, many volcanoes B. Cretaceous mass extinction 1. end of mesozioc (dinosaurs) 2. Yucatan meteor 3. reduction in photosynthesis collapse of food chains V. Big Picture Phylogeny A. some major events 1. origin of Earth 4.5 bya 2. origin of life 4.0 bya 3. oxygen began accumulating 2.7 bya 4. origin of eukaryotes 2.1 bya 5. multicellular eukaryotes 1.2 bya 6. most animal phyl 500 mya 7. colonization of land (plants, animals, fungi) 500 mya...
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- Spring '08