Last updated on March 17, 2014 at 1:24 EDT

Latest Tyrone Daulton Stories

2010-08-30 20:20:40

Shock-synthesized diamonds said to prove a catastrophic impact killed off North American megafauna can't be foundAbout 12,900 years ago, a sudden cold snap interrupted the gradual warming that had followed the last Ice Age. The cold lasted for the 1,300-year interval known as the Younger Dryas (YD) before the climate began to warm again.In North America, large animals known as megafauna, such as mammoths, mastodons, saber-tooth tigers and giant short-faced bears, became extinct. The...