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33.9 – 23 MA

Epoch · Paleogene

Oligocene

33.9–23 Ma

The Oligocene is an epoch within the Paleogene, spanning roughly 33.9 to 23 million years ago.

Rankepoch· Paleobiology Database
Base33.9 Ma· Paleobiology Database
Top23 Ma· Paleobiology Database
Duration10.9 Myr· Paleobiology Database
ChartICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables)

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Cite this article

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

BibTeX · CSL-JSON

@misc{stratum-oligocene,
  title        = {Oligocene},
  author       = {{Stratum Strata}},
  howpublished = {\url{https://stratum.black/strata/time/oligocene}},
  year         = {2026},
  note         = {Time interval article, Stratum Strata pack 2026.09, as of 2026-09-21; sources: stratum, pbdb. Accessed 2026-09-21.}
}

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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.

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