Geologic units in Montague county, Texas

Antlers Sand (Early Cretaceous) at surface, covers 44 % of this area

Antlers Sand

Nocona Formation (Permian; Wolfcamp and Leonard Series) at surface, covers 18 % of this area

Nocona Formation

Archer City Formation (Permian; Wolfcamp Series) at surface, covers 16 % of this area

Archer City Formation

Markley Formation (Pennsylvanian to Early Permian) at surface, covers 11 % of this area

Markley Formation

Goodland Limestone and Walnut Clay, undivided (Early Cretaceous; Comanchean Series) at surface, covers 5 % of this area

Goodland Limestone and Walnut Clay, undivided

Alluvium (Holocene) at surface, covers 4 % of this area

Alluvium

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

Terrace deposits

Kiamichi Formation (Early Cretaceous; Comanchean Series) at surface, covers 0.3 % of this area

Kiamichi Formation

Fort Worth Limestone and Duck Creek Formation, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Fort Worth Limestone and Duck Creek Formation, undivided

Alluvium (Holocene) at surface, covers < 0.1 % of this area

WOODWARD- Lenticular and interfingering deposits of gravel, sand, silt, and clay. Generally light-tan to gray. Thickness along major streams ranges up to 100 feet and probably averages 40 feet; along minor streams the thickness ranges up to 45 feet and probably averages 20 feet. ENID- Sand, silt, clay, and locally gravel. Maximum thickness ranges from 30 to 80 feet (9 to 24 m) along major streams and from 0 to 60 feet (0 to 18 m) along minor streams. TULSA- Gravel, sand, silt, and clay. TULSA- Gravel, sand, silt, and clay. OKLAHOMA CITY- Sand, silt, clay, and lenticular beds of gravel. Thickness ranges from about 30 to 100 feet and probably averages about 50 feet along major streams. Along minor streams, thickness ranges from a few feet to about 50 feet and probably averages about 25 feet. LAWTON- Sand, clay, and gravel as much as 50 feet (15 m) thick; Shown only along major streams and tributaries. ARDMORE-SHERMAN- Gravel, sand, silt, and clay, including low terraces; thickness, about 25 to 100 feet. McALESTER TEXARKANA- Gravel, sand, silt, and clay, including low terraces about 30 feet above channels; thickness, about 50 feet along Little River and 110 feet along Red River.