Geologic units in Madison county, Arkansas

Additional scientific data in this geographic area

Atoka Formation, undivided (Middle Pennsylvanian- Atokan) at surface, covers 41 % of this area

Atoka Formation, undivided

Boone Formation (Early Mississippian- Meramecian to Osagean) at surface, covers 24 % of this area

Boone Formation

Bloyd Shale, and Prairie Grove Member of the Hale Formation (Middle Pennsylvanian- Morrowan) at surface, covers 19 % of this area

Bloyd Shale, and Prairie Grove Member of the Hale Formation

Pitkin Limestone, Fayetteville Shale (including the Wedington Sandstone member), and Batesville Sandstone (including the Hindsville Limestone Member) (Late Mississippian- Chesterian) at surface, covers 9 % of this area

Pitkin Limestone, Fayetteville Shale (including the Wedington Sandstone member), and Batesville Sandstone (including the Hindsville Limestone Member)

Cane Hill Member of Hale Formation (Early Pennsylvanian- Morrowan) at surface, covers 5 % of this area

Cane Hill Member of Hale Formation

Powell Dolomite (Early Ordovician) at surface, covers 1 % of this area

Powell Dolomite

St. Peter Sanstone and Everton Formation (Middle Ordovician) (Middle Ordovician) at surface, covers 0.8 % of this area

St. Peter Sanstone and Everton Formation (Middle Ordovician)

Cotter and Jefferson City Dolomites (Early Ordovician) at surface, covers 0.5 % of this area

Cotter and Jefferson City Dolomites

Chattanooga Shale (Lower Mississippian and Upper Devonian), Clifty Limestone (Middle Devonian), and Penters Chert (Lower Devonian) (Early Mississippian to Early Devonian) at surface, covers 0.2 % of this area

Chattanooga Shale (Lower Mississippian and Upper Devonian), Clifty Limestone (Middle Devonian), and Penters Chert (Lower Devonian)