The Virgilian series is the youngest part of the Pennsylvanian epoch in the North American geologic classification series.[1] During Virgilian times, the top of the Conemaugh and the entire Monongahela group were deposited.[2] 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
References
- ^ Heckel, P. H.; Clayton, G. (2005). "The Carboniferous System. Use of the new official names for the subsystems, series, and stages". Geologica Acta. doi:10.1344/105.000000354.
- ^ Eble, Cortland F.; Pierce, Brenda S.; Grady, William C. (2005). "Palynology, petrography and geochemistry of the Sewickley coal bed (Monongahela Group, Late Pennsylvanian), Northern Appalachian Basin, USA". International Journal of Coal Geology. doi:10.1016/S0166-5162(03)00110-1.