Skip to main content

Monongahela Group

Monongahela Group - non-marine cyclic sequences of sandstone, siltstone, red and gray shale, limestone, and coal. Contains the Uniontown and Pittsburgh Formations. Extends from the top of the Waynesburg coal to the base of the Pittsburgh coal. Includes the Waynesburg, Uniontown, Sewickley, Redstone and Pittsburgh coals. Thickness is 170 feet in Mineral and Grant Counties.
State West Virginia
Name Monongahela Group
Geologic age Pennsylvanian
Comments Thickness: Northeastern 170 ft, Western 300 ft
Primary rock type sandstone
Secondary rock type siltstone
Other rock types shale; limestone; coal
Lithologic constituents
Sedimentary > Carbonate > Limestone
Sedimentary > Coal
Map references
Digital version of 1968 printed map available from with the specific data available from
Unit 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.
Counties Barbour - Braxton - Brooke - Cabell - Calhoun - Clay - Doddridge - Gilmer - Hancock - Harrison - Kanawha - Lewis - Lincoln - Marion - Marshall - Mason - Mineral - Monongalia - Ohio - Preston - Putnam - Ritchie - Roane - Taylor - Tyler - Upshur - Wayne - Wetzel - Wirt - Wood