Geologic units in Franklin county, Missouri

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 47 % of this area

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

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 22 % of this area

Sandstone, chert and interbedded dolomite

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

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

Pennsylvanian Undifferentiated (Pennsylvanian) at surface, covers 11 % of this area

Pennsylvanian Undifferentiated

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

Alluvium - clay, silt, sand, and gravel.

Undifferentiated (Ordovician rocks) (Ordovician) at surface, covers 1 % of this area

Undifferentiated (Ordovician rocks)

St. Peter Sandstone, Everton Formation (Middle Ordovician to Early Ordovician) at surface, covers 1 % of this area

St. Peter Sandstone, Everton Formation

Eminence Dolomite, Potosi Dolomite (Late Cambrian-Croixian Series) at surface, covers 0.7 % of this area

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

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 0.5 % of this area

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

Decorah Group, Plattin Group (Middle Ordovician-Mohawkian Series) at surface, covers 0.4 % of this area

Decorah Group, Plattin Group

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

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

Joachim Dolomite, Dutchtown Formation (Middle Ordovician-Mohawkian Series) at surface, covers 0.2 % of this area

Joachim Dolomite, Dutchtown Formation

Leemon Formation, Maquoketa Group, Cape Limestone, Kimmswick Limestone, Noix-Cyrene Limestone, Maquoketa Shale (Late Ordovician to Middle Ordovician) at surface, covers < 0.1 % of this area

Leemon Formation, Maquoketa Group including: (Girardeau Limestone, Orchard Creek Shale, Thebes Sandstone, Cape La Croix Shale), Cape Limestone, Kimmswick Limestone, Noix-Cyrene Limestone, Maquoketa Shale.

Devonian System (Late to Early Devonian) at surface, covers < 0.1 % 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.

Cherokee Group - Cabaniss Subgroup, Krebs Subgroup (Middle Pennsylvanian-Middle Series-Desmonian Stage) at surface, covers < 0.1 % of this area

Cabaniss Subgroup - cyclic deposits, shale, sandstone, clay and several workable coal beds. Krebs Subgroup - cyclic deposits, sandstone, siltstone, shale, clay and some workable coal beds.