Cycle 14 & 15

1. Cycle 14 & 15 Geologic Time Scale & Important Events in Earth History

2. Phanerozoic Eon • Cenozoic Era • Quaternary Period • Holocene Epoch

3. WHERE ARE WE IN GEO TIME? • Eons>Eras>Periods>Epochs • Phanerozoic Eon • Cenozoic Era • Quaternary Period • Holocene Epoch

4. Key events in Precambrian Eon/Era • Earth Forms& Cools (~4.6 bya) • Oceans Form (~4 bya) • First Life (~3.5 bya) • Atmosphere Forms & Changes • First Continents (~4 bya) • END: major extinction

5. Key events in Precambrian Eon/Era

6. Key events in Paleozoic Era • Many new organisms (first with hard parts) evolve in ocean in short time, an “explosion” of evolution. • First fish • First land plants • First amphibians • Coal swamps • First reptiles • END: biggest extinction

7. Key events in Paleozoic Era

8. Key events in Mesozoic Era • Pangaea exists, but later splits apart leading to continents we know today • First mammals • Dinosaurs become dominant • First seed and flower plants • END: Major Extinction at least in part caused by meteor impact

9. Key events in Mesozoic Era

10. Key events in Cenozoic Era • Mammals become more diverse and abundant after extinction of dinosaurs • Himalayas & Alps form as continents begin to look like today • Most recent ice ages • 1st Humans

11. Key events in Cenozoic Era