The Rise and Fall of the Ediacaran Biota - Google Books

http://books.google.de/books?id=GA7-8JIh9IwC&pg=PA15&dq=Vendian#v=onepage&q=Vendian&f=false

The Proterozoic and early Phanerozoic was a time punctuated by a series of significant events in Earth history. Glaciations of global scale wracked the planet, interfingered with dramatic changes in oceanic and atmospheric chemistry and marked changes in…