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 and fossils of fishes such as Bandringa are known from the Kittaning Formation, which is part of the Allegheny Group. 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: Upper Freeport Coal Lower Freeport Coal Upper Kittanning Coal Middle Kittanning Coal Lower Kittanning Coal Brookville Coal Members Glen Richey (PA), Laurel Run (PA), Mineral Springs (PA), Millstone Run (PA), Clearfield Creek (PA); Clarion (OH, MD, PA, WV), Kittanning (PA), Freeport (PA, MD, OH, WV); Putnam Hill (OH, PA); Vanport (PA, MD, OH, WV); Butler (MD, PA), Worthington (MD, PA); Washingtonville (OH, PA, WV), Columbiana (OH) Age Relative age dating of the Allegheny places it in the middle Pennsylvanian period. See also Geology of Pennsylvania Geology of West Virginia References Pennsylvanian Series Carboniferous geology of Pennsylvania Carboniferous geology of Rhode Island Carboniferous Maryland Carboniferous West Virginia Sandstone formations of the United States Shale formations of the United States Coal formations Coal in the United States Geologic formations of Indiana Geologic formations of Maryland Geologic formations of Ohio Geologic formations of Pennsylvania Geologic formations of Rhode Island Geologic formations of Virginia Geologic formations of West Virginia Carboniferous geology of Virginia Carboniferous southern paleotropical deposits