Virgilian series
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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