19th century scientists created the first geologic column.docx - Justin Porter 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

19th century scientists created the first geologic column.docx

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Justin Porter Earth Systems 7 th period 1. 19 th century scientists created the first geologic column. 2. 146 million years ago Cretaceous Period begin 4 eras then period Epoch 3. Divided the geologic time scale into smaller units 4. 4600 bya Precambrian time began is when they were found 5. Quaternary, Tertiary Cretaceous Jurassic Triassic Carboniferous Devonian 6. Implications of the cell theory 7. Large areas of exposed Precambrian rocks 8. Fossils are rare 9. Pale ozone Era 10. Devonian Period 11. Mass extinction of large number of Paleozoic life ferm occurred at the end of the Permian period. 12. Lizards, turtles, crocodiles, snakes 13. Lizard tripped dino 14. Present day dramatic changes in climate, Age of mammals 15. Epoch 16. Rare 17. Paleozoic life forms occurred 18. New species that were adapted to life in cooler climate appeared 19. Alps and Himalayas in Eurasia 20. Geologic column 21. When the seas retreated at the end of the Permian period trilobites became extinct 22. The cone of the earth 23.
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