1. Origins of water, atmosphere, life

2. outline Age of the earth The Hadean Oldest rocks & water Early atmosphere & earliest fossils Oxygenated atmosphere and life

3. Ray Troll PHANEROZOIC

4. PRE- CAMBRIAN

6. SODA!

8. 4 2.5 0.5 Hadean Archean Proterozoic Phanero

9. Hadean 4 2.5 0.5 Hadean Archean Proterozoic Phanero

11. Hadean 4 2.5 0.5 Hadean Archean Proterozoic Phanero

13. Hadean 4 2.5 0.5 Hadean Archean Proterozoic Phanero

15. The Essential Elements

17. Oldest rocks ~4byo Mineral evidence from oceans: 4byo Hydrothermal activity No mountains Very little “land” LOTS of volcanoes 4 2.5 0.5 Hadean Archean Proterozoic Phanero

19. Oldest rocks ~4byo Mineral evidence from oceans: 4byo Hydrothermal activity No mountains Very little “land” LOTS of volcanoes 4 2.5 0.5 Hadean Archean Proterozoic Phanero

20. Prokaryotes (and Archaea) 4 2.5 0.5 Hadean Archean Proterozoic Phanero

21. Entophysalis 4 2.5 0.5 Hadean Archean Proterozoic Phanero

22. 4 2.5 0.5 Hadean Archean Proterozoic Phanero

23. We love carbon dioxide! 4 2.5 0.5 Hadean Archean Proterozoic Phanero

24. How do we know?

25. 4 2.5 0.5 Hadean Archean Proterozoic Phanero

26. 4 2.5 0.5 Hadean Archean Proterozoic Phanero

27. 4 2.5 0.5 Hadean Archean Proterozoic Phanero

28. Summary Oceans formed early Early atmosphere was toxic (to us…) Early life photosynthesized and poisoned the atmosphere

29. 4 2.5 0.5