Geologic units in Mills county, Texas

Travis Peak Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 54 % of this area

Travis Peak Formation

Lithology: conglomerate; sandstone; limestone

Paluxy Sand and Glen Rose Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 27 % of this area

Paluxy Sand and Glen Rose Limestone, undivided

Lithology: sandstone; limestone; claystone

Glen Rose Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 6 % of this area

Glen Rose Limestone

Lithology: limestone; clay or mud; sandstone; conglomerate

Strawn Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atoka Des Moines]) at surface, covers 3 % of this area

Strawn Group

Lithology: shale; sandstone; clay or mud; sandstone; conglomerate; coal

Paluxy Sand (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 2 % of this area

Paluxy Sand

Lithology: sand; sandstone; limestone

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 2 % 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

Lithology: sand ; silt ; clay or mud; gravel; carbonate

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

Terrace deposits

Lithology: terrace; sand; gravel; silt; clay or mud

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

alluvium

Lithology: sand; silt; clay or mud; gravel

undivided part Fredericksberg Group (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 2 % of this area

undivided part Fredericksberg Group

Lithology: clay or mud; limestone; mudstone; shale

Walnut Clay (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area

Walnut Clay

Lithology: clay or mud; limestone; shale