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Earth

Earth. Exact Age of Earth: _______. Geologic Dating Methods I: Radioactive Decay. http://www.btinternet.com/~j.doyle/SR/Emc2/decay_a-decay.gif. Geologic Dating Methods II: Known Rates of Radioactive Decay. http://people.hofstra.edu/j_b_bennington/2cnotes/halflife.JPG.

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Earth

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  1. Earth Exact Age of Earth: _______

  2. Geologic Dating Methods I: Radioactive Decay http://www.btinternet.com/~j.doyle/SR/Emc2/decay_a-decay.gif

  3. Geologic Dating Methods II: Known Rates of Radioactive Decay http://people.hofstra.edu/j_b_bennington/2cnotes/halflife.JPG

  4. Radiocarbon half-lifes Geologic Dating Methods III: Ratios of Parent : Daughter Atoms

  5. EARTH’S OLDEST ROCKS 4.03 BYA (Acosta Gneisses) 3.7 – 3.8 BYA 3.4 – 3.5 BYA 3.4 – 3.6 BYA http://pubs.usgs.gov/gip/geotime/age.html

  6. Earth’s Oldest Known Rocks (Probably do NOT date to Earth’s Formation)

  7. Geologic Forces(e.g., Plate Tectonics)

  8. Origin of Solar System

  9. IRON METEORITES(Canyon Diablo) Age: 4.53-4.58 BYA (U > Pb) http://pubs.usgs.gov/gip/geotime/age.html

  10. Canyon Diablo Crater(Near Flagstaff AZ)

  11. LUNAR ROCKS Oldest Moon Rocks: 4.4-4.5 BYA http://pubs.usgs.gov/gip/geotime/age.html

  12. Earth’s Origin (~ 4.5-4.6 BYA)

  13. 500 Million Years After Origin of Earth (Artistic Rendition) http://www.arcadiastreet.com/cgvistas/earth/images/earth_ancient_volcano_600.jpg

  14. The Earth Cools (Artistic Rendition) http://www.cartage.org.lb/en/themes/Sciences/Paleontology/Paleozoology/Precambrian/Precambrian.htm

  15. Atmospheric Oxygen Levels http://ncbi.nlm.nih.gov

  16. Predominantly Non-Oxidized Sediments

  17. Ancient Evidence for Free Oxygen • Isua Rock (Greenland): ~ 3.7 Billion Years Old • Metamorphosed Sediments • Abundant Free Uranium – Likely Only in • Oxidizing Environment

  18. Oxygen Liberating Process?

  19. Ancient Fossil “Cyanobacteria”(3.47 BYA) Apex Chert in Western Australia (Pilbara Formation) http://www.cartage.org.lb/en/themes/Sciences/Paleontology/Paleozoology/Precambrian/ApexChert.jpg

  20. Fossil Stromatolites(3.5 BYA)

  21. Living Stromatolites(Shark Bay Australia)

  22. Living Stromatolites(Cross-Section)

  23. Fossil Stromatolites (with Fossil Microorganisms) Gunflint Chert – Ontario, Canada (2 BYA)

  24. Origin of the Cell?

  25. Origin of Organic Macromolecules?

  26. Hypothesis I: Terrestrial Accretion (Miller – Urey Experiments 1950s)

  27. Hypothesis II: Meteoric and Cometary Infall of Organic Molecules formed Elsewhere (Present Day Meterites can contain 1% Organic Molecules)

  28. Hypothesis III: Meteoric and Cometary Infall of Cells formed Elsewhere (e.g., Mars)

  29. Origin of Cell Membrane?

  30. Hypothesis: Drying, Rehydrating of Tide Pools Fig. 2.4 in Willis and McElwain 2002

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