"Here we are providing independent evidence of rock cooling and miles of exhumation in the Cryogenian period across a large area of North America." The study relies on a detailed interpretation of ...

The Cryogenian period (~720–635 million years ago, Ma) is defined by a pair of these Snowball Earth events; the longer glaciation (Sturtian) lasted for ~57 million years, followed by a brief ...

Cryogenian; Ed., Ediacaran; Ꞓ, Cambrian ... They underscore the importance of extreme climatic events in the reorganization of terrestrial biodiversity. The 'boring billion' refers to a period in ...

Vase-shaped microfossils (VSMs) occupy a narrow range in the fossil record, with identifiable taxa appearing late in the Tonian Period (ca. 1000-720 Ma) and disappearing near the onset of the ...

The time frame means these sandstones formed during the Cryogenian Period, from 720 million to 635 million years ago. The name is derived from "cold birth" in ancient Greek and is synonymous with ...