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Pennsylvanian Subperiod
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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 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.

Pennsylvanian Subperiod: References & Edit History

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  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Modified link of Web site: Ohio History Central - Pennsylvanian Period. May 08, 2017
Text added that updates the interval's boundary years. May 08, 2013
Updated geologic time data. May 25, 2010
Period-level geologic time chart added. Dec 28, 2009
Added new Web site: Ohio History Central - Pennsylvanian Period. Aug 10, 2007
Article revised and updated. May 21, 2007
Article added to new online database. Jul 20, 1998
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