Stratum.black Open reference
252 – 201 MA

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.

Rankperiod· Paleobiology Database
Base252 Ma· Paleobiology Database
Top201 Ma· Paleobiology Database
Duration50.5 Myr· Paleobiology Database
ChartICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables)

Contains

Part of

Typical taxa

Elsewhere

Cite this article

Stratum Strata. "Triassic" (Time interval). Stratum Strata pack 2026.09, as of 2026-09-21. https://stratum.black/strata/time/triassic. Accessed 2026-09-21.

BibTeX · CSL-JSON

@misc{stratum-triassic,
  title        = {Triassic},
  author       = {{Stratum Strata}},
  howpublished = {\url{https://stratum.black/strata/time/triassic}},
  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.

Sources for this article: Stratum editorial (Stratum editorial);Paleobiology Database (CC-BY-4.0). As of 2026-09-21; Strata pack 2026.09. Data reproduced under the licences shown; text in Stratum's own words unless a section names its source.

Found an error? Write to drew@tyr.ac with the article id interval:triassic.

Stratum is the inventory, provenance and certificate system for fossil, mineral and shell collections. Strata is its open reference: every fact cites its source, and the credits page lists each one with its licence.

CreditsVerifySitemap