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Pennsylvanian Subperiod
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Carboniferous Period. geologic time
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Animals & Nature

Pennsylvanian Subperiod

geochronology
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Carboniferous Period.
Carboniferous Period.
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Category: Animals & Nature
Related Topics:
fossil
Cordaites
Edaphosaurus
Mesosaurus
Gastrioceras
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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.