Warty algae-like sheets survived Snowball Earth events

Between about 730 million and 635 million years ago, during the Cryogenian Period of the Late Proterozoic, Earth is thought to have been almost completely covered in ice twice, events that scientists have termed “Snowball Earth” glaciations. The first global glaciation, the Sturtian, lasted from 730 million to 700 million years ago, and the second, the Marinoan, lasted from 660 million to 635 million years ago. Both glaciations likely put severe limitations on the ability of life — predominately microorganisms — to thrive. 
 

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Lucas Joel

Lucas Joel was EARTH's 2015 summer intern.

Joel (www.lvjwriting.com) is a freelance science journalist. He has a master's in paleontology from the University of California, Riverside, and is currently based in Boulder, Colo. 

Thursday, November 19, 2015 - 06:00