Early Pennsylvanian

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The Early Pennsylvanian (also known as the Lower Pennsylvanian) is the first of three subepochs of the Pennsylvanian epoch of the Carboniferous period. It spans the time between 318.1 ± 1.3 Ma and 311.7 ± 1.1 Ma (million years ago). It has one faunal stage, the Bashkirian.

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GeoWhen Database - Early Pennsylvanian

Carboniferous period
Mississippian			Pennsylvanian
Lower/Early	Middle	Upper/Late	Lower/Early	Middle	Upper/Late
Tournaisian	Viséan	Serpukhovian	Bashkirian	Moscovian	Kasimovian \| Gzhelian