Geologic units in Archer county, Texas

Nocona Formation (Permian; Wolfcamp and Leonard Series) at surface, covers 35 % of this area

Nocona Formation

Archer City Formation (Permian; Wolfcamp Series) at surface, covers 33 % of this area

Archer City Formation

Petrolia Formation (Permian; Wolfcamp to Leonard Series) at surface, covers 15 % of this area

Petrolia Formation

Alluvium (Holocene) at surface, covers 5 % of this area

Alluvium

Markley Formation (Pennsylvanian to Early Permian) at surface, covers 5 % of this area

Markley Formation

High gravel deposits (Pleistocene) at surface, covers 2 % of this area

High gravel deposits

Terrace deposits (Pleistocene and Holocene) at surface, covers 2 % of this area

Terrace deposits

Admiral and Coleman Junction Formations, undivided (Permian; Wolfcamp Series) at surface, covers 1 % of this area

Admiral and Coleman Junction Formations, undivided

Waggoner Ranch Formation (Permian; Leonard Series) at surface, covers 0.8 % of this area

Waggoner Ranch Formation

Quaternary deposit, undivided (Quaternary) at surface, covers 0.7 % of this area

Quaternary deposit, undivided