Period · Neoproterozoic
Cryogenian
720–635 Ma
The Cryogenian is a period within the Neoproterozoic, spanning roughly 720 to 635 million years ago.
| Rank | period· Paleobiology Database |
|---|---|
| Base | 720 Ma· Paleobiology Database |
| Top | 635 Ma· Paleobiology Database |
| Duration | 85 Myr· Paleobiology Database |
| Chart | ICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables) |
Elsewhere
Cite this article
Stratum Study. "Cryogenian" (Time interval). Stratum Study pack 2026.09, as of 2026-09-19. https://stratum.black/study/time/cryogenian. Accessed 2026-09-20.
@misc{stratum-cryogenian,
title = {Cryogenian},
author = {{Stratum Study}},
howpublished = {\url{https://stratum.black/study/time/cryogenian}},
year = {2026},
note = {Time interval article, Stratum Study pack 2026.09, as of 2026-09-19; sources: stratum, pbdb. Accessed 2026-09-20.}
} Citations carry the pack version and the article's as-of date so they resolve to the same text later. The facts themselves belong to the sources listed below; cite those for the science.