Geologic units in Cleburne county, Arkansas

Bloyd Shale, and Prairie Grove Member of the Hale Formation (Middle Pennsylvanian- Morrowan) at surface, covers 58 % of this area

Bloyd Shale, and Prairie Grove Member of the Hale Formation

Atoka Formation, undivided (Middle Pennsylvanian- Atokan) at surface, covers 32 % of this area

Atoka Formation, undivided

Cane Hill Member of Hale Formation (Early Pennsylvanian- Morrowan) at surface, covers 10 % of this area

Cane Hill Member of Hale Formation