Rhuddanian

Rank	age· Macrostrat
Base	443 Ma· Macrostrat
Top	440 Ma· Macrostrat
Duration	2.6 Myr· Macrostrat
Chart	ICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables)

Elsewhere

Macrostrat: 236
PBDB: 191
ICS chart (stratigraphy.org)
Wikipedia: Rhuddanian

Cite this article

Stratum Study. "Rhuddanian" (Time interval). Stratum Study pack 2026.09, as of 2026-09-19. https://stratum.black/study/time/rhuddanian. Accessed 2026-09-20.

BibTeX · CSL-JSON

@misc{stratum-rhuddanian,
  title        = {Rhuddanian},
  author       = {{Stratum Study}},
  howpublished = {\url{https://stratum.black/study/time/rhuddanian}},
  year         = {2026},
  note         = {Time interval article, Stratum Study pack 2026.09, as of 2026-09-19; sources: stratum, macrostrat, 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.

Part of

Elsewhere