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1. Cryogenian: The Cryogenian ( /kraɪoʊˈdʒɛniən/, from Ancient Greek:, meaning "cold" and γένεσις, romanized: génesis, meaning "birth") is a geologic period that lasted from 720 to 635 million years ago. It forms the second geologic period of the Neoproterozoic Era, preceded by the Tonian ... (Earth) [100%] 2022-03-11 [Cryogenian] [Neoproterozoic]...
2. Cryogenian: The Cryogenian is the second part of the Neoprotozoic Era in the geologic system of classifying geologic formations. It follows the Tonian period and precedes the Ediacarian. [100%] 2023-03-03 [Geologic Systems]