Geologic units in Bowie county, Texas

Terrace deposits (Pleistocene and Holocene) at surface, covers 31 % of this area

Terrace deposits

Midway Group, undivided (Paleocene) at surface, covers 24 % of this area

Midway Group, undivided

Alluvium (Holocene) at surface, covers 20 % of this area

Alluvium

Wilcox Group, undivided (Paleocene to Eocene) at surface, covers 18 % of this area

Wilcox Group, undivided

Navarro Group, undivided (Late Cretaceous; Gulfian Series) at surface, covers 7 % of this area

Navarro Group, undivided

Alluvium (Holocene) at surface, covers 0.2 % 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.

Alluvium - Alluvial deposits in major stream channels or in mappable meanders of major streams (Holocene) at surface, covers 0.1 % of this area

Alluvial deposits in major stream channels or in mappable meanders of major streams - Includes alluvial deposits in natural levees in some areas.

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

Alluvial deposits of present streams

Marlbrook Marl (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Marlbrook Marl