Jackfork Sandstone
(Early Pennsylvanian- Morrowan) at surface, covers 18 % of this area Jackfork Sandstone
Alluvium
(Holocene) at surface, covers 12 % of this area Alluvial deposits of present streams
Johns Valley Shale
(Early Pennsylvanian- Morrowan) at surface, covers 4 % of this area Johns Valley Shale
Harthshorne Sandstone
(Middle Pennsylvanian- Des Moinesian) at surface, covers 2 % of this area Harthshorne Sandstone
Terrace deposits
(Late Pleistocene) at surface, covers 2 % of this area Alluvial deposits on one or more terrace levels
Stanley Shale
(Early Mississippian) at surface, covers 2 % of this area Stanley Shale - Includes Chickasaw Creek Chert equivalent of Harlton (1938) near top and Hatton Tuff Lentil and Hot Springs Sandstone Member near base
McAlester Formation
(Middle Pennsylvanian- Des Moinesian) at surface, covers 1 % of this area McAlester Formation
