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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.
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Carboniferous Period.
Carboniferous Period. The Carboniferous Period began approximately 358.9 million years ago and ended 298.9 million years ago.

Pennsylvanian Subperiod

geochronology
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History

Pennsylvanian Subperiod, second major interval of the Carboniferous Period, lasting from 323.2 million to 298.9 million years ago. The Pennsylvanian is recognized as a time of significant advance and retreat by shallow seas. Many nonmarine areas near the Equator became coal swamps during the Pennsylvanian. These areas are mined for coal today. See Carboniferous Period.

This article was most recently revised and updated by John P. Rafferty.