Geologic units in Osage county, Missouri

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 53 % of this area

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

Pennsylvanian Undifferentiated (Pennsylvanian) at surface, covers 22 % of this area

Pennsylvanian Undifferentiated

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 13 % of this area

Sandstone, chert and interbedded dolomite

Gasconade Dolomite (Early Ordovician-Ibexian Series) at surface, covers 8 % of this area

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

Holocene series (Quaternary-Holocene Series) at surface, covers 4 % of this area

Alluvium - clay, silt, sand, and gravel.

Marmaton Group (Middle Pennsylvanian-Middle Series-Desmonian Stage) at surface, covers < 0.1 % of this area

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

Eminence Dolomite, Potosi Dolomite (Late Cambrian-Croixian Series) at surface, covers < 0.1 % of this area

Eminence Dolomite - dolomite with some druse - coated chert. Potosi Dolomite - dolomite with abundance of druse - coated chert.