Geologic units in Sainte Genevieve county, Missouri

Lamotte Sandstone (Late Cambrian-Croixian Series) at surface, covers 18 % of this area

Sandstone with some dolomitic and shaly lenses; coarse - graines to conglomeratic and arkosic at base.

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 14 % of this area

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

Elvins Group - (including Derby-Doerun Dolomite, Davis Formation), Bonneterre Dolomite (Late Cambrian-Croixian Series) at surface, covers 11 % of this area

Derby-Doerun Dolomite - alternating thin dolomite, siltstone, and shale; Davis Formation - glauconitic shale with fine - grained sandstone, limestone, and dolomite); Bonneterre Dolomite - dolomite, dolomitic limestone, and limestone; glauconitic in lower part.

Gasconade Dolomite (Early Ordovician-Ibexian Series) at surface, covers 9 % of this area

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

Meramecian Series (Late Mississippian-Meramecian Series) at surface, covers 8 % of this area

St. Louis Limestone, Salem Formation, Warsaw Formation.

Eminence Dolomite, Potosi Dolomite (Late Cambrian-Croixian Series) at surface, covers 8 % of this area

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

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 7 % of this area

Sandstone, chert and interbedded dolomite

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 5 % of this area

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

Holocene series (Quaternary-Holocene Series) at surface, covers 5 % of this area

Alluvium - clay, silt, sand, and gravel.

St. Peter Sandstone, Everton Formation (Middle Ordovician to Early Ordovician) at surface, covers 4 % of this area

St. Peter Sandstone, Everton Formation

Decorah Group, Plattin Group (Middle Ordovician-Mohawkian Series) at surface, covers 4 % of this area

Decorah Group, Plattin Group

Joachim Dolomite, Dutchtown Formation (Middle Ordovician-Mohawkian Series) at surface, covers 3 % 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 2 % 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.

Chesterian Series (Late Mississippian-Chesterian Series) at surface, covers 0.7 % of this area

Fayetteville Formation, Batesville Formation, Hindville Limestone, Vienna Limestone, Tar Springs Sandstone, Glen Dean Formation, Hardinsburg Formation, Golconda Formation, Cypress Formation, Paint Creek Formation, Yankeetown Sandstone, Renault Formation, Aux Vases Sandstone, Ste. Genevieve Limestone.

Devonian System (Late to Early Devonian) at surface, covers 0.5 % 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.

St. Francois Mountains intrusive suite (subvolcanic, alkali granitic ring complexes) (Precambrian Y) at surface, covers 0.3 % of this area

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

Silurian system (Late Silurian- to Early Silurian) at surface, covers 0.2 % of this area

Joliet Limestone, Bowling Green Dolomite, Bryant Knob Formation, Bainbridge Formation, Sexton Creek Limestone.

Kimmswick (Trenton) Limestone and Decorah Formation (Upper Ordovician (Stage 6)) at surface, covers 0.2 % of this area

Kimmswick (Trenton) Limestone and Decorah Formation in southern and western Illinois.

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone) (Mississippian (Visean)) at surface, covers < 0.1 % of this area

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone).

Warsaw Formation and Salem Limestone (Mississippian (Visean)) at surface, covers < 0.1 % of this area

Warsaw Formation and Salem Limestone in western Illinois.

Diabase dikes and sills (Precambrian Y) at surface, covers < 0.1 % of this area

Diabase dikes and sills.

St. Louis Limestone (Mississippian (Visean)) at surface, covers < 0.1 % of this area

St. Louis Limestone.

Kinderhookian Series (Early Mississippian-Kinderhookian Series) at surface, covers < 0.1 % of this area

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

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers < 0.1 % of this area

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone.