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Mineral Resources > Online Spatial Data > Geology > by state > Texas Geology

Geologic units in Fannin county, Texas

Ector Chalk (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 1 % of this area

Ector Chalk

Lithology: limestone

Gober Chalk and Roxton Limestone (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 23 % of this area

Gober Chalk and Roxton Limestone

Lithology: limestone; limestone

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 16 % of this area

Terrace deposits

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

Pecan Gap Chalk (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.9 % of this area

Pecan Gap Chalk

Lithology: limestone; sand; clay or mud; limestone

Ozan Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 13 % of this area

Ozan Formation

Lithology: clay or mud

Wolfe City Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 2 % of this area

Wolfe City Formation

Lithology: sand; silt; mudstone

Eagle Ford Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 10 % of this area

Eagle Ford Formation

Lithology: shale; siltstone; limestone

Woodbine Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area

McALESTER TEXARKANA- Sand, dark-green, yellowish-red, white, gray, fine- to coarse-grained, tuffaceous in upper part; crossbedded, quartzose, and brownish-red noncalcareous clay; some gravel lentils with little to no quartz and some lignites and fossil plants; rests unconformably upon successively older Cretaceous units eastward; thickness, 325 to 455 feet, increasing eastward.

Lithology: sandstone; clay or mud; gravel; coal

Marlbrook Marl (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area

Marlbrook Marl

Lithology: clay or mud; limestone

Bonham Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 16 % of this area

Bonham Formation

Lithology: mudstone; clay or mud

Woodbine Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 1 % of this area

Woodbine Formation

Lithology: shale; sand; clay or mud; limestone; coal; tuff

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 10 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Alluvium (Phanerozoic | Cenozoic | Quaternary | 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

Lithology: alluvium

Brownstown Marl (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 4 % of this area

Brownstown Marl

Lithology: clay or mud

Blossom Sand (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 2 % of this area

Blossom Sand

Lithology: sand; clay or mud