Precambrian Websites:
robertcharleswolf.net
Robert Charles Wolf - Biography
The website is maintained by Robert Charles Wolf, an Iowa freelance writer, author of Fossils of Iowa, and Iowa's State Parks.
snowballearth.org
SNOWBALL EARTH
The Snowball Earth website examines the evidence and theory behind the snowball earth hypothesis, the idea that the globe was covered by ice for long periods roughly 2220, 710...