Geologic units in Morgan county, Missouri

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers 55 % of this area

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

Gasconade Dolomite (Early Ordovician-Ibexian Series) at surface, covers 25 % of this area

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

Roubidoux Formation (Early Ordovician-Ibexian Series) at surface, covers 19 % of this area

Sandstone, chert and interbedded dolomite

Kinderhookian Series (Early Mississippian-Kinderhookian Series) at surface, covers 0.8 % 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 0.7 % 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.

Pennsylvanian Undifferentiated (Pennsylvanian) at surface, covers 0.3 % of this area

Pennsylvanian Undifferentiated

Eminence Dolomite, Potosi Dolomite (Late Cambrian-Croixian Series) at surface, covers 0.1 % 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 < 0.1 % of this area

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