Geologic units in Jones county, Texas

Clear Fork Group (Permian; Leonard Series) at surface, covers 48 % of this area

Clear Fork Group

Seymour Formation (Middle Pleistocene; Irvingtonian) at surface, covers 18 % of this area

Seymour Formation

Quaternary deposit, undivided (Quaternary) at surface, covers 17 % of this area

Quaternary deposit, undivided

Alluvium (Holocene) at surface, covers 8 % of this area

Alluvium

San Angelo Formation (Permian; Guadalupe Series) at surface, covers 4 % of this area

San Angelo Formation

Sand sheet deposits (Holocene) at surface, covers 2 % of this area

Sand sheet deposits

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

Terrace deposits

Lueders Formation (Permian; Leonard Series) at surface, covers 1 % of this area

Lueders Formation

Blaine Formation (Permian; Guadalupe Series) at surface, covers 0.2 % of this area

Blaine Formation