Sturtian-Varangian

A late Precambrian glaciation episode ranging from 950Ma to 600Ma, represented by tillite deposits in Congo, Australia, China, North America, Sahara and Norway. Generally considered to be divisible into at least two (Sturtian around 800Ma and Minoan/Varanger 650Ma) or four significant glaciation extremes. The tillite deposits occurred also in what is believed to be low latitudes, which lead to the hypothesis of Snowball Earth