SANTA BARBARA, Calif., May 28 (UPI) -- U.S. scientists are challenging the prevailing views of the effects of the so-called "Snowball Earth" glaciations on life on Earth.
Researchers from the University of California-Santa Barbara analyzed microfossils found in rocks at the bottom of the Grand Canyon to challenge current theories concerning the effects of the glaciers occurring approximately 635 million to 726 million years ago. Those glaciations are thought to have been responsible for the widespread deaths of early life on Earth.