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Past Climates

Past Climates. Snow Ball Earth between 750 and 600 million years ago. 2 Billion years ago O2 began forming in the atmosphere. CO2 has been a driver of Climate for Millions of years. (phanerozoic 550 Mya to present) There have been large ice sheets during the Phanerozoic ~300 Mya

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Past Climates

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  1. Past Climates

  2. Snow Ball Earth between 750 and 600 million years ago.

  3. 2 Billion years ago O2 began forming in the atmosphere

  4. CO2 has been a driver of Climate for Millions of years. (phanerozoic 550 Mya to present) There have been large ice sheets during the Phanerozoic ~300 Mya Our present Ice age began around 2 MYa Most of the past 200 Myr has been very warm and dominated by a greenhouse Earth. Our present state (the Pliestocene began about 2 Myr ago) http://www.atmosedu.com/Geol390/articles/RoyeretalCO2GSAToday%2704PhanerozoicClimate.pdf

  5. K-T boundary ~ 65 Million years ago. End of Dinosaurs. Evidence suggests Asteroid impact cause global cooling for several years

  6. Shock patterns in quartz

  7. Chicxulub (Chik-shoo-loob) impact crater Near Cancun, Mx. “tail of the devil”??

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