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Geologic units in Marion county, Arkansas

Additional scientific data in this geographic area

Cotter and Jefferson City Dolomites (Early Ordovician) at surface, covers 31 % of this area

Cotter and Jefferson City Dolomites

St. Peter Sanstone and Everton Formation (Middle Ordovician) (Middle Ordovician) at surface, covers 27 % of this area

St. Peter Sanstone and Everton Formation (Middle Ordovician)

Boone Formation (Early Mississippian- Meramecian to Osagean) at surface, covers 27 % of this area

Boone Formation

Powell Dolomite (Early Ordovician) at surface, covers 12 % 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 3 % of this area

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