Sturtian glaciation
Glacial Snowball Earth event about 700 million years ago
The Sturtian glaciation, also known as the Sturt glaciation, was a worldwide glaciation during the Cryogenian Period when the Earth experienced repeated large-scale glaciations. The Sturtian glaciation is thought to have lasted from c. 717 Ma to c.
From Wikipedia, under CC BY-SA. More on occurri.