Geologic units in Wright county, Missouri

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 84 % of this area

Fine crystalline, silty, cherty dolomite, and oolitic chert with local sandstone beds.

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 14 % of this area

Sandstone, chert and interbedded dolomite

Gasconade Dolomite (Early Ordovician-Ibexian Series) at surface, covers 1.0 % of this area

Coarse - crystalline cherty dolomite with a basal Gunter Sandstone Member.

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 0.6 % of this area

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

Kinderhookian Series (Early Mississippian-Kinderhookian Series) at surface, covers 0.5 % of this area

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

Cherokee Group - Cabaniss Subgroup, Krebs Subgroup (Middle Pennsylvanian-Middle Series-Desmonian Stage) at surface, covers < 0.1 % 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.