Allegheny Formation


The Pennsylvanian Allegheny Formation is a mapped bedrock unit in western and central Pennsylvania, western Maryland and West Virginia, and southeastern Ohio. It is a major coal-bearing unit in the Appalachian Plateau of the eastern United States.

Description

In Pennsylvania, the Allegheny Formation includes rocks from the base of the Brooksville Coal to the top of the Upper Freeport Coal, and was defined to include all economically significant coals in the upper Pennsylvanian sequence. The formation consists of cyclothemic sequences of coal, shale, limestone, sandstone, and clay. It contains six major coal zones, which, in stratigraphic order, are:
Glen Richey, Laurel Run, Mineral Springs, Millstone Run, Clearfield Creek ; Clarion, Kittanning, Freeport ; Putnam Hill ; Vanport ; Butler, Worthington ; Washingtonville, Columbiana

Age

Relative age dating of the Allegheny places it in the middle Pennsylvanian period.