Geologic units in Mercer county, Missouri

Pleasanton Group (Late Pennsylvanian-Upper Series-Missourian Stage) at surface, covers 42 % of this area

Dominantly shale and sandstone with minor coal.

Marmaton Group (Middle Pennsylvanian-Middle Series-Desmonian Stage) at surface, covers 28 % of this area

Cyclic deposits, shale and limestone with sandstone, clay and several coal beds, some workable.

Kansas City Group (Late Pennsylvanian-Upper Series-Missourian Stage) at surface, covers 27 % of this area

Cyclic deposits, limestone and shale with minor sandstone and coal.

Cherokee Group - Cabaniss Subgroup, Krebs Subgroup (Middle Pennsylvanian-Middle Series-Desmonian Stage) at surface, covers 2 % of this area

Cabaniss Subgroup - cyclic deposits, shale, sandstone, clay and several workable coal beds. Krebs Subgroup - cyclic deposits, sandstone, siltstone, shale, clay and some workable coal beds.

Marmaton Group (Middle Pennsylvanian, upper Desmoinesian) at surface, covers < 0.1 % of this area

Interval includes Morgan School, Mouse Creek, Labette, Pawnee, Bandera, Altamont, Nowata, Lenapah, Memorial, Lost Branch formations. Primary Lithologies: shale/mudstone, light to dark gray; limestone, fossiliferous. Secondary Lithologies: mudstone, green-gray to red/maroon; shale, black, phosphatic; sandstone, very fine to medium grained. Minor: coal; siltstone, conglomerate. Maximum thicknesses: 125-175 ft (38-52 m).