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11. geologic time notes
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11. geologic time notes

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  • 1. GEOLOGIC TIME
  • 2. GEOLOGIC HISTORY • Determined by major characteristics in the Earth’s surface, climate, and types of organisms
  • 3. ERA: • A unit of geologic time that contains two or more periods
  • 4. PERIOD: • A unit of geologic time that is longer than an epoch, but shorter than an era
  • 5. EPOCH: • A unit of geologic time that is longer than an age but shorter than a period
  • 6. ERAS & PERIODS
  • 7. ERAS, PERIODS, & EPOCHS
  • 8. AGE OF THE EARTH • 4.6 Billion Years Old
  • 9. PRECAMBRIAN ERA: • 4.6 Billion to 542 Million Years Ago • 88% of the Earth’s History • Very little is known because rock layers have been eroded and deformed by plate tectonics • Period during which the atmosphere and as a result life originated
  • 10. PALEOZOIC ERA: • 542 Million to 251 Million Years Ago • Continents went from separate to Pangea during this time period • Far richer in plant and animal life • Vertebrates such as fish, reptiles, and amphibians developed • 90% of marine and 70% of land life died at end of era
  • 11. MESOZOIC ERA: • 251 million years to 65.5 million years ago • Continents begin to drift apart • Age of Reptiles, including dinosaurs • Mass extinction at end, possibly by an asteroid • Flowering plants begin to develop
  • 12. CENOZOIC ERA: • 65.5 million years ago to Present • Temperatures decreased • Age of mammals • Fossils of first humanoids began to develop