Phanerozoic Eon

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A chart detailing the Carboniferous period within the Paleozoic era, showing its division into Mississippian and Pennsylvanian subperiods, with corresponding epochs, ages, and their ranges in millions of years ago.

A chart showing the Cretaceous period of the Mesozoic era on the geologic time scale, listing its division into Upper and Lower epochs, with stages such as Maastrichtian, Campanian, and Berriasian, and corresponding ages in millions of years ago.

A chart detailing the Devonian period of the Paleozoic era, showing its division into Lower, Middle, and Upper series with stages such as Lochkovian, Pragian, Emsian, Eifelian, Givetian, Frasnian, and Famennian, alongside corresponding ages in millions of years ago.

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 Jurassic period within the Mesozoic era, listing its division into Lower, Middle, and Upper epochs with corresponding ages such as Hettangian, Oxfordian, and Tithonian, along with their approximate millions of years ago.

A geologic time scale chart details the Neogene period of the Cenozoic era, listing its epochs (Miocene and Pliocene) and stages with corresponding ages in millions of years ago, ranging from 23.03 to 2.58 million years ago.

A chart showing the Ordovician period within the Paleozoic era on the geologic time scale, listing its division into Lower, Middle, and Upper epochs, with corresponding stage names and their ages in millions of years ago.

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.

A geologic time scale chart showing the Permian period of the Paleozoic era, divided into Cisuralian, Guadalupian, and Lopingian epochs with their corresponding ages and millions of years ago.

A geologic time scale chart showing the Silurian period of the Paleozoic era, listing its epochs and stages with corresponding ages in millions of years ago, from 443.8 to 419.2 million years ago.

Phanerozoic Eon: References & Edit History

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Asia
Tectonic framework

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The Editors of Encyclopaedia Britannica
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Rasoul Shiri

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Article History

Type	Description	Contributor	Date
	Modified link of Web site: Nature - Scientific Reports - Variations in climate habitability parameters and their effect on Earth's biosphere during the Phanerozoic Eon.	Gloria Lotha	Apr 05, 2025
	Add new Web site: Nature - Scientific Reports - Variations in climate habitability parameters and their effect on Earth's biosphere during the Phanerozoic Eon.	Yamini Chauhan	Feb 20, 2025
	Add new Web site: National Center for Biotechnology Information - PubMed Central - The Phanerozoic climate.	Yamini Chauhan	Nov 25, 2024
	Add new Web site: Khan Academy - Biodiversity flourishes in Phanerozoic eon.	Yamini Chauhan	Aug 09, 2024
	Add new Web site: Geosciences LibreTexts - Phanerozoic Eon - Paleozoic Era.	Gloria Lotha	Sep 25, 2023
	Add new Web site: University of South Alabama - Cambrian Explosion.	Grace Young	Apr 18, 2016
	Add new Web site: Perseus Digital Library - The Paleozoic.	Grace Young	Apr 18, 2016
	Add new Web site: UNESCO - Encyclopedia of Life Support Systems - Proterozoic History.	Grace Young	Apr 18, 2016
	Timing of the origin of life on Earth changed from the Proterozoic Eon to the Archean Eon.	John P. Rafferty Rasoul Shiri	Sep 25, 2015
	Cross-references added.	John P. Rafferty	Sep 08, 2015
	Geologic boundary years updated.	John P. Rafferty Rasoul Shiri	Sep 08, 2015
	Updated geologic time data.	Richard Pallardy	May 25, 2010
	Article revised and updated.	Richard Pallardy	Aug 11, 2008
	Added new Web site: Palaeos - The Phanerozoic Eon.	Shiveta Singh	Apr 06, 2008
	Article added to new online database.	The Editors of Encyclopaedia Britannica	Jul 20, 1998