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Pennsylvanian Subperiod
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Carboniferous Period. geologic time
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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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Article 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.