Geologic units in Douglas county, Missouri

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 60 % of this area

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

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 35 % of this area

Sandstone, chert and interbedded dolomite

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 3 % of this area

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

Gasconade Dolomite (Early Ordovician-Ibexian Series) at surface, covers 1 % of this area

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

Kinderhookian Series (Early Mississippian-Kinderhookian Series) at surface, covers 0.8 % of this area

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