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Geologic units in Van Buren county, Arkansas

Bloyd Shale, and Prairie Grove Member of the Hale Formation (Middle Pennsylvanian- Morrowan) at surface, covers 57 % of this area

Bloyd Shale, and Prairie Grove Member of the Hale Formation

Atoka Formation, undivided (Middle Pennsylvanian- Atokan) at surface, covers 35 % of this area

Atoka Formation, undivided

Cane Hill Member of Hale Formation (Early Pennsylvanian- Morrowan) at surface, covers 7 % of this area

Cane Hill Member of 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 0.2 % of this area

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