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Geologic units in Knox county, Missouri

Meramecian Series (Late Mississippian-Meramecian Series) at surface, covers 47 % of this area

St. Louis Limestone, Salem Formation, Warsaw Formation.

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 35 % of this area

Keokuk Limestone, Burlington Limestone, Elsey Formation, Reeds Spring Formation, Pierson Limestone, Fern Glen Formation.

Cherokee Group - Cabaniss Subgroup, Krebs Subgroup (Middle Pennsylvanian-Middle Series-Desmonian Stage) at surface, covers 15 % 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.

Riverton Formation, Burgner Formation (Middle Pennsylvanian-Atokan Stage) at surface, covers 3 % of this area

Shale, clay, coal. Burgner Formation - limestone.

Kinderhookian Series (Early Mississippian-Kinderhookian Series) at surface, covers 0.3 % of this area

Northview Shale, Sedalia Formation, Compton Limestone, Bachelor Formation Chouteau Group, Hannibal Shale, Horton Creek Limestone.