1. Cryogenian - Adjective
2. Cryogenian - Proper noun
Cryogenian (comparative more Cryogenian, superlative most Cryogenian)
(geology) Of a geologic period within the Neoproterozoic era from about 850 to 600 million years ago.
Cryogenian
(geology) The Cryogenian period.
Possibly as a consequence of the low-latitude position of most continents, several large-scale glacial events occurred during the Neoproterozoic Era including the Sturtian and Marinoan glaciations of the Cryogenian. Source: Internet
The melting of the ice may have presented many new opportunities for diversification, and may indeed have driven the rapid evolution which took place at the end of the Cryogenian period. Source: Internet
The only extensive iron formations that were deposited after the Paleoproterozoic (after 1.8 billion years ago) are associated with Cryogenian glacial deposits. Source: Internet