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Geologic units in Stephens county, Texas

Harpersville Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Virgil]) at surface, covers 54 % of this area

Harpersville Formation

Pueblo Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers 15 % of this area

Pueblo Formation

Lithology: mudstone; sandstone

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 11 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Antlers Sand (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 7 % of this area

Antlers Sand

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 3 % of this area

Terrace deposits

Thrifty and Graham Formations, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgil]) at surface, covers 1 % of this area

Thrifty and Graham Formations, undivided

Palo Pinto Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers 0.9 % of this area

Palo Pinto Formation

Lithology: sandstone; shale; limestone

Wolf Mountain Shale (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers 0.2 % of this area

Wolf Mountain Shale

Lithology: shale; sandstone; limestone

Sedwick and Moran Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers 0.1 % of this area

Sedwick and Moran Formations, undivided

Moran Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area

Moran Formation

Sedwick Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area

Sedwick Formation