Events of the Cryogenian period Axis Scale: Millions of Years Ago (Ma).
The Sturtian glaciation was a worldwide glaciation during the CryogenianPeriod when the Earth experienced repeated large-scale glaciations.[2][4] As of January 2023[update], the Sturtian glaciation is thought to have lasted from c. 717 Ma to c. 660 Ma, a time span of approximately 57 million years.[2] It is hypothesised to have been a Snowball Earth event, or contrastingly multiple regional glaciations, and is the longest and most severe known glacial event preserved in the geologic record after the much earlier Huronian glaciation.
^Arnaud, Emmanuelle; Halverson, Galen P.; Shields-Zhou, Graham Anthony (30 November 2011). "Chapter 1 The geological record of Neoproterozoic ice ages". Memoirs. 36 (1): 1–16. doi:10.1144/M36.1.