Period · Paleoproterozoic
Orosirian
2050–1800 Ma
The Orosirian is a period within the Paleoproterozoic, spanning roughly 2050 to 1800 million years ago.
| Rank | period· Paleobiology Database |
|---|---|
| Base | 2050 Ma· Paleobiology Database |
| Top | 1800 Ma· Paleobiology Database |
| Duration | 250 Myr· Paleobiology Database |
| Chart | ICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables) |
Elsewhere
Cite this article
Stratum Strata. "Orosirian" (Time interval). Stratum Strata pack 2026.09, as of 2026-09-21. https://stratum.black/strata/time/orosirian. Accessed 2026-09-21.
@misc{stratum-orosirian,
title = {Orosirian},
author = {{Stratum Strata}},
howpublished = {\url{https://stratum.black/strata/time/orosirian}},
year = {2026},
note = {Time interval article, Stratum Strata pack 2026.09, as of 2026-09-21; sources: stratum, pbdb. Accessed 2026-09-21.}
} 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.