1. Snowball Earth

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

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

4. http://www.atmosedu.com/Geol390/articles/RoyeretalCO2GSAToday%2704PhanerozoicClimate.pdf 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

6. Most of the past 200 Myr has been very warm and dominate by a greenhouse Earth. Our present state (the Pliestocene began about 2 Myr ago)

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

10. Shock patterns in quartz

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