Period · Mesozoic
Triassic
252–201 Ma
The Triassic is a period within the Mesozoic, spanning roughly 252 to 201 million years ago. First dinosaurs, ichthyosaurs and true mammals; Petrified Forest wood and Muschelkalk crinoids come from here.
| Rank | period· Paleobiology Database |
|---|---|
| Base | 252 Ma· Paleobiology Database |
| Top | 201 Ma· Paleobiology Database |
| Duration | 50.5 Myr· Paleobiology Database |
| Chart | ICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables) |
Elsewhere
Cite this article
Stratum Study. "Triassic" (Time interval). Stratum Study pack 2026.09, as of 2026-09-19. https://stratum.black/study/time/triassic. Accessed 2026-09-20.
@misc{stratum-triassic,
title = {Triassic},
author = {{Stratum Study}},
howpublished = {\url{https://stratum.black/study/time/triassic}},
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.