The Cryogenian period (~720–635 million years ago, Ma) is defined by a pair of these Snowball Earth events; the longer ...

The study, by Dr. N.L. Swanson-Hysell at Princeton University in Princeton, NJ, and colleagues, was titled, "Cryogenian Glaciation and the Onset of Carbon-Isotope Decoupling." ...

This concept is supported by evidence found in sedimentary rocks formed under glacial conditions ... their role during the ...