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Geologic units in Carter county, Missouri

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 52 % of this area

Sandstone, chert and interbedded dolomite

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

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

Eminence Dolomite, Potosi Dolomite (Late Cambrian-Croixian Series) at surface, covers 7 % of this area

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

St. Francois mountains volcanic supergroup (Precambrian Y) at surface, covers 0.5 % of this area

Chiefly alkali rhyolitic ash - flow tuffs, lava flows, and bedded tuffs, with minor trachytes.

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 0.3 % of this area

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

St. Francois Mountains intrusive suite (subvolcanic, alkali granitic ring complexes) (Precambrian Y) at surface, covers < 0.1 % of this area

St. Francois Mountains intrusive suite (subvolcanic, alkali granitic ring complexes).