Geologic units in Sharp county, Arkansas

Geologic units in Sharp county, Arkansas

Additional scientific data in this geographic area

Cotter and Jefferson City Dolomites (Early Ordovician) at surface, covers 43 % of this area

Cotter and Jefferson City Dolomites

St. Peter Sanstone and Everton Formation (Middle Ordovician) (Middle Ordovician) at surface, covers 32 % of this area

St. Peter Sanstone and Everton Formation (Middle Ordovician)

Powell Dolomite (Early Ordovician) at surface, covers 22 % of this area

Powell Dolomite

Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician) (Late Ordovician to Middle Ordovician) at surface, covers 1 % of this area

Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician)

Cretaceous rocks (Cretaceous) at surface, covers 0.9 % of this area

Cretaceous rocks

Boone Formation (Early Mississippian- Meramecian to Osagean) at surface, covers 0.5 % of this area

Boone Formation

Chattanooga Shale (Lower Mississippian and Upper Devonian), Clifty Limestone (Middle Devonian), and Penters Chert (Lower Devonian) (Early Mississippian to Early Devonian) at surface, covers 0.1 % of this area

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

Gravel (Tertiary) at surface, covers < 0.1 % of this area

Gravel on isolated hills within 40 miles (64km) of the Mississippi Embayment. Many small deposits to the west not shown

Sand and clay (Cretaceous) at surface, covers < 0.1 % of this area

Sand and clay

Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (Early Ordovician-Ibexian Series) at surface, covers < 0.1 % of this area

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