Geologic units in Miller county, Missouri

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 40 % of this area

Sandstone, chert and interbedded dolomite

Gasconade Dolomite (Early Ordovician-Ibexian Series) at surface, covers 33 % of this area

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

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 26 % of this area

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

Eminence Dolomite, Potosi Dolomite (Late Cambrian-Croixian Series) at surface, covers 0.4 % of this area

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

Pennsylvanian Undifferentiated (Pennsylvanian) at surface, covers 0.3 % of this area

Pennsylvanian Undifferentiated

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 0.2 % of this area

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