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Virgilian series

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The Virgilian series is the most recent part of the Pennsylvanian epoch in the North American geologic classification series. In the older Appalachian classification system, this series was known as the Monongahela group. As with other Carboniferous series, it comprises cyclothems, or distinct cycles of sedimentary rock formation.

Monongahela cyclothems (youngest at top)

Note: the names below are of the Conemaugh age, not Monongahela age

Upper Little Pittsburgh
Lower Little Pittsburgh
Little Clarksburgh
Elk Lick
Duquesne
Gaysport
Ames
Harlem
Upper Bakerstown
Anderson
Wilgus
Upper Brush Creek
Lower Brush Creek
Mason
Mahoning

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