Geologic units in Gasconade county, Missouri

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 42 % of this area

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

Pennsylvanian Undifferentiated (Pennsylvanian) at surface, covers 39 % of this area

Pennsylvanian Undifferentiated

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 12 % of this area

Sandstone, chert and interbedded dolomite

Gasconade Dolomite (Early Ordovician-Ibexian Series) at surface, covers 2 % of this area

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

St. Peter Sandstone, Everton Formation (Middle Ordovician to Early Ordovician) at surface, covers 2 % of this area

St. Peter Sandstone, Everton Formation

Holocene series (Quaternary-Holocene Series) at surface, covers 2 % of this area

Alluvium - clay, silt, sand, and gravel.

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 0.3 % of this area

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

Devonian System (Late to Early Devonian) at surface, covers 0.3 % of this area

Chattanooga Shale, Sylamore Sandstone, Fortune Formation, Holts Summit Sandstone, Snyder Creek Shale, Cedar Valley Limestone, Louisiana Limestone, Saverton Shale, Grassy Creek Shale, Turpin Sandstone, Bushberg Sandstone, Glen Park Limestone, St. Larent Limestone, Beauvais Sandstone, Grand Tower Limestone, Clear Creek Chert, Little Saline Limestone, Grassy Knob Chert, Bailey Formation.

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.