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Earth

Explore Earth's ancient past through radioactive decay dating methods, oldest rocks, lunar samples, and more. Discover the origin of life hypotheses and atmospheric evolution in this fascinating journey through time.

jdinapoli
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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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