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Allegheny Formation

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Cyclic sequences of sandstone, siltstone, shale, limestone, and coal. Includes the Freeport, Kittanning and Clarion coals, also, the Princess coals of Kentucky . Extends from the top of the Upper Freeport coal to the top of the Homewood Sandstone.
State West Virginia
Name Allegheny Formation
Geologic age Pennsylvanian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Siltstone
Minor
Sedimentary > Coal
Sedimentary > Carbonate > Limestone
Comments Thickness: Northeastern 150-200 ft, Western 325 ft
References

Cardwell, D.H., Erwin, R.B., and Woodward, H.P., 1968 (slightly revised 1986), Geologic Map of West Virginia: West Virginia Geological and Economic Survey, Map 1, East Sheet, scale 1:250,000.
NGMDB product
Counties Barbour - Boone - Braxton - Cabell - Clay - Fayette - Grant - Hancock - Kanawha - Lewis - Lincoln - Logan - Marion - Mineral - Mingo - Monongalia - Nicholas - Pendleton - Pleasants - Preston - Putnam - Raleigh - Randolph - Ritchie - Roane - Taylor - Tucker - Upshur - Wayne - Webster - Wirt - Wood - Wyoming