1. Mineral Resources
  2. Online Spatial Data
  3. Geology
  4. by state
  5. Arkansas geologic units

Geologic units in Johnson county, Arkansas

Additional scientific data in this geographic area

Atoka Formation, undivided (Middle Pennsylvanian- Atokan) at surface, covers 66 % of this area

Atoka Formation, undivided

McAlester Formation (Middle Pennsylvanian- Des Moinesian) at surface, covers 9 % of this area

McAlester Formation

Bloyd Shale, and Prairie Grove Member of the Hale Formation (Middle Pennsylvanian- Morrowan) at surface, covers 9 % of this area

Bloyd Shale, and Prairie Grove Member of the Hale Formation

Harthshorne Sandstone (Middle Pennsylvanian- Des Moinesian) at surface, covers 7 % of this area

Harthshorne Sandstone

Savanna Formation (Late Pennsylvanian- Des Moinesian) at surface, covers 4 % of this area

Savanna Formation

Alluvium (Holocene) at surface, covers 3 % of this area

Alluvial deposits of present streams

Terrace deposits (Late Pleistocene) at surface, covers 1 % of this area

Alluvial deposits on one or more terrace levels

Cane Hill Member of Hale Formation (Early Pennsylvanian- Morrowan) at surface, covers 0.5 % of this area

Cane Hill Member of Hale Formation