Allegheny Group

Allegheny Group
Stratigraphic range: (Moscovian) ~311–306.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Bituminous coal (Clarion Coal) from the Allegheny Group, Ohio
Type	Sedimentary
Sub-units	Freeport Formation Upper Freeport Coal Upper Freeport Limestone Member Butler Sandstone Member Lower Freeport Coal Freeport Sandstone Member Kittanning Formation Upper Kittanning Coal Johnstone Limestone Member Middle Kittanning Coal Lower Kittanning Coal Kittanning Sandstone Member Vanport Limestone Member
Underlies	Conemaugh Group
Overlies	Kanawha Formation and Pottsville Formation
Lithology
Primary	Sandstone, coal
Location
Region	Appalachian Mountains
Country	United States
Extent	Pennsylvania, Maryland, West Virginia, Ohio
Type section
Named by	H. D. Rogers, 1840[1]

The Allegheny Group, often termed the Allegheny Formation,^[2] is a Pennsylvanian-age geological unit in the Appalachian Plateau. It is a major coal-bearing unit in the eastern United States, extending through western and central Pennsylvania, western Maryland and West Virginia, and southeastern Ohio. Fossils of fishes such as Bandringa are known from the Kittaning Formation,^[3] which is part of the Allegheny Group.