Paleogene Period

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Eocene paleogeography

A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years.

Chart showing the Paleogene period of the Cenozoic era on the geologic time scale, listing its epochs-Oligocene, Eocene, and Paleocene-each divided into stages with corresponding ages in millions of years ago.

Paleogene Period: References & Edit History

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Article History

Type	Description	Contributor	Date
	Modified link of Web site: Smithsonian Libraries and Archives - DSpace Repository - Paleogene Fossils and the Radiation of Modern Birds (PDF).	Aakanksha Gaur	Aug 30, 2026
	Add new Web site: CiteSeerX - The Palaeogene time-scale:radiometricdating versus magnetostratigraphic approach (PDF).	Gloria Lotha	Feb 21, 2025
	Add new Web site: Academia - Toward a revised Paleogene geochronology.	Gloria Lotha	Oct 15, 2024
	Add new Web site: University of Maryland - Department of Geology - The Cenozoic Era: The Paleogene Period.	Grace Young	Sep 07, 2024
	Add new Web site: Smithsonian Libraries and Archives - DSpace Repository - Paleogene Fossils and the Radiation of Modern Birds (PDF).	Gloria Lotha	Jul 12, 2024
	Add new Web site: Natural History Museum - Paleogene Period.	Gloria Lotha	Jun 13, 2023
	Add new Web site: National Park Service - Paleogene Period�66.0 to 23.0 MYA.	Gloria Lotha	Mar 09, 2023
	New text added that updates the interval's boundary years.	John P. Rafferty	May 17, 2013
	Geologic time chart of the Paleogene Period added.	John P. Rafferty	May 17, 2013
	Map depicting the configuration of landmasses present during the Early Tertiary Period added.	John P. Rafferty	Aug 27, 2010
	New text clarifying the relationships between the Neogene, Paleogene, Tertiary, and Quaternary periods added.	John P. Rafferty	Aug 14, 2009
	Added new Web site: National Geographic - Science - Paleogene Period.	Dutta Promeet	Apr 17, 2009
	Article revised and updated.	John P. Rafferty	May 17, 2007
	Article added to new online database.	The Editors of Encyclopaedia Britannica	Jul 20, 1998