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Geologic units in Warren county, Missouri

Osagean Series (Early Mississippian-Osagean Series) at surface, covers 49 % of this area

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

Undifferentiated (Ordovician rocks) (Ordovician) at surface, covers 14 % of this area

Undifferentiated (Ordovician rocks)

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 12 % of this area

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

St. Peter Sandstone, Everton Formation (Middle Ordovician to Early Ordovician) at surface, covers 10 % of this area

St. Peter Sandstone, Everton Formation

Holocene series (Quaternary-Holocene Series) at surface, covers 9 % of this area

Alluvium - clay, silt, sand, and gravel.

Cherokee Group - Cabaniss Subgroup, Krebs Subgroup (Middle Pennsylvanian-Middle Series-Desmonian Stage) at surface, covers 3 % 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.

Kinderhookian Series (Early Mississippian-Kinderhookian Series) at surface, covers 3 % of this area

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

Devonian System (Late to Early Devonian) at surface, covers 2 % 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.

Meramecian Series (Late Mississippian-Meramecian Series) at surface, covers < 0.1 % of this area

St. Louis Limestone, Salem Formation, Warsaw Formation.