Brallier Formation | |
---|---|
Stratigraphic range: Frasnian - Famennian[1] | |
Type | sedimentary |
Sub-units | Black Creek Siltstone Member,[2] Minnehaha Springs Member[3] |
Underlies | Greenland Gap Group and Scherr Formation |
Overlies | Harrell Formation |
Thickness | 1350 to 1800 feet in central PA[4] |
Lithology | |
Primary | shale, sandstone |
Location | |
Region | Appalachian Mountains |
Country | United States |
Extent | Maryland, Pennsylvania, Virginia, and West Virginia |
Type section | |
Named by | Charles Butts, 1918[4] |
The Devonian Brallier Formation is a mapped bedrock unit in Pennsylvania, Maryland, West Virginia, and Virginia.