Middle Ordovician

Rank	epoch· Paleobiology Database
Base	471 Ma· Paleobiology Database
Top	458 Ma· Paleobiology Database
Duration	12.9 Myr· Paleobiology Database
Chart	ICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables)

Elsewhere

PBDB: 30
ICS chart (stratigraphy.org)
Wikipedia: Middle Ordovician

Cite this article

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

BibTeX · CSL-JSON

@misc{stratum-middle-ordovician,
  title        = {Middle Ordovician},
  author       = {{Stratum Study}},
  howpublished = {\url{https://stratum.black/study/time/middle-ordovician}},
  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.

Contains

Part of

Elsewhere