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Mass extinctions
- 5. http://www.earth.rochester.edu/ees207/Mass_Ext/higgins_mass2.html The Cyclical Nature of Extinction Events It has been suggested that mass extinction events occur in a roughly cyclical manner--that is, about every 26 million years. The following graph is a product of a 1984 study by Raup and Sepkoski and shows clearly that major extinction events seem to be quite regularly distributed over time. (WARNING! This claim is still very controversial!)
- 7. http://freerepublic.com/focus/f-news/1050165/posts?page=353 1980 630,000 years ago 2 million years ago http://www.icr.org/pubs/imp/imp-302.htm,
- 8. Fig. 21.16, p. 347
- 10. Jon Burnett, Oct 1/03, Wales
- 15. Last Few Seconds of the Cretaceous
- 17. Location of the Chicxulub crater (circle) on Mexico's Yucatan Peninsula. http://www.icr.org/pubs/imp/imp-334.htm
- 23. Triassic-Jurassic Manicouagan, Canada (214 Myr) 100 km
- 24. Morasko, Poland