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Geologic units in Jones county, Texas

Clear Fork Group (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 46 % of this area

Clear Fork Group

Seymour Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle [Irvingtonian]) at surface, covers 19 % of this area

Seymour Formation

Lithology: sand; gravel; clay or mud

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

sand, silt, clay, and gravel. locally indurated with calcium carbonate (caliche); includes point bar, natural levee, stream channel, sand dune, terrace, alluvial fan, landslide bolson and playa deposits

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 8 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

San Angelo Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 4 % of this area

San Angelo Formation

sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 2 % of this area

sand sheet deposits

Lithology: sand; silt

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 2 % of this area

Terrace deposits

Lueders Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.4 % of this area

Lueders Formation

Lithology: shale; limestone

Blaine Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.2 % of this area

Blaine Formation