The Conewango Group is a Carboniferous aged

geologic group In geology, a group is a lithostratigraphic unit consisting of a series of related formations that have been classified together to form a group. Formations are the fundamental unit of stratigraphy. Groups may sometimes be combined into superg ...

in Western and south central

Pennsylvania Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state, state spanning the Mid-Atlantic (United States), Mid-Atlantic, Northeastern United States, Northeastern, Appalachian, and Great Lakes region, Great Lakes regions o ...

. It consists of two formations the younger Casselman Formation and the older

Glenshaw Formation The Glenshaw Formation is a mapped sedimentary bedrock unit in Pennsylvania, Maryland, West Virginia, and Ohio, of Pennsylvanian age. It is the lower of two formations in the Conemaugh Group, the upper being the Casselman Formation. The boun ...

References

{{Pennsylvania-geologic-formation-stub Geologic groups of Pennsylvania Carboniferous geology of Pennsylvania Shale groups of the United States Sandstone groups of the United States Limestone groups of the United States Coal groups