LOCATION USTIBUCK OKEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Ustic Epiaquerts
TYPICAL PEDON: Ustibuck silty clay --forested. (Colors are for dry soil unless otherwise stated.)
A--0 to 25 cm (0 to 10 inches); reddish brown (5YR 4/3) silty clay, dark reddish brown (5YR 3/3) moist; common medium distinct dark reddish gray (5YR 4/2) redoximorphic iron depletions; strong fine angular blocky structure; common fine very dark gray (N 3/0) nodules; medium pressure faces along surfaces of cracks; slightly alkaline; clear smooth boundary. (20 to 58 cm, 8 to 23 inches thick)
Bss--25 to 79 cm (10 to 31 inches); reddish brown (5YR 5/3) clay, reddish brown (5YR 4/3) moist; common medium distinct dark reddish gray (5YR 4/2) redoximorphic iron depletions; strong fine angular blocky structure; very hard, firm; common fine very dark gray (N 3/0) nodules; few slickensides; cracks 5 cm wide; slightly alkaline; gradual smooth boundary. (18 to 104 cm, 7 to 41 inches thick)
Cg--79 to 124 cm (31 to 49 inches); reddish brown (5YR 5/4) and reddish gray (5YR 5/2) reduced matrix, silty clay; reddish brown (5YR 4/4) and dark reddish gray (5YR 4/2) moist; massive; very hard, firm; common fine very dark gray (N 3/0) nodules; moderately alkaline; gradual smooth boundary. (0 to 135 cm, 0 to 53 inches thick)
C--124 to 203 cm (49 to 80 inches); dark gray (5YR 4/1) silty clay; very dark gray (5YR 3/1) moist; massive; moderately alkaline.
TYPE LOCATION: Okfuskee County, Oklahoma; about 2 miles northwest of Haydenville about 1,250 feet east and 1,950 feet north of the southwest corner of sec. 7, T. 13 N., R. 10 E.
RANGE IN CHARACTERISTICS:
Soil moisture: These soils have an ustic moisture regime bordering on udic. The soil moisture control section is dry in some or all parts for more than 90 days, but less than 110 cumulative days in normal years. The soil is driest in July through August, while September through June is the wettest.
Mean annual soil temperature: 12.8 to 16.1 degrees C (55 to 61 degrees F)
There is enough active ferrous iron (Fe2+) present within 50 cm of the mineral soil surface to give a positive reaction to alpha, alpha-dipyridyl.Depth to episaturation: 0 to 50 cm (0 to 20 inches)
Water table: The depth to the bottom of the wet layer ranges from 50 to greater than 203 cm (20 to greater than 80 inches).
Ochric epipedon thickness: 20 to 58 cm (8 to 23 inches)
Depth to cambic horizon: 20 to 58 cm (8 to 23 inches)
Depth to slickensides: 20 to 58 cm (8 to 23 inches)
Solum thickness: 50 to 162 cm (20 to 64 inches)
Depth to secondary calcium carbonate: Greater than 102 cm (40 inches).
A horizon(s):
Hue: 7.5YR or 5YR
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 1 to 6
Redoximorphic features: Iron depletions are in shades of gray, iron concentrations are in shades of red or brown
Texture (less than 2mm): Silty clay loam, clay loam, silty clay, or clay
Clay content: 35 to 60 percent
Reaction: pH 6.6 to 7.3
Bss horizon(s):
Hue: 7.5YR or 5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 1 to 4
Redoximorphic features: Iron depletions are in shades of gray, iron concentrations are in shades of red or brown
Texture (less than 2 mm): Silty clay, silty clay loam, or clay
Clay content: 35 to 60 percent
Reaction: pH 6.6 to 8.4
Cg horizon(s):
Hue: 7.5YR or 5YR
Value: 4 or 5 dry, 3 to 5 moist
Chroma: 1 to 4
Redoximorphic features: Iron depletions are in shades of gray, iron concentrations are in shades of red or brown
Texture (less than 2 mm): Silty clay, silty clay loam, or clay (Some pedons are stratified with thin layers of silt loam.)
Clay content: 35 to 60 percent
Calcium carbonate equivalent: 0 to 10 percent
Reaction: pH 6.6 to 8.4
C horizon(s):
Hue: 7.5YR or 5YR
Value: 4 dry, 3 moist
Chroma: 1 to 4
Texture (less than 2 mm): Silty clay, silty clay loam, or clay (Some pedons are stratified with thin layers of silt loam.)
Clay content: 35 to 60 percent
Calcium carbonate equivalent: 0 to 10 percent
Reaction: pH 6.6 to 8.4
COMPETING SERIES: These are the
EASTALL,
RANCO,
RANDALL, and
ROSSTON series.
EASTALL soils are formed in clayey lacustrine sediments in depressional areas, have a typic ustic moisture regime, and do not have a 7.5YR or redder hue throughout the profile.
RANCO soils are formed in clayey lacustrine sediments in playa basins and have an aridic-ustic moisture regime.
RANDALL soils are formed in clayey lacustrine sediments in playa basins and have an aridic-ustic moisture regime.
ROSSTON soils formed in clayey lacustrine sediments in closed depressions and have a typic ustic moisture regime.
GEOGRAPHIC SETTING:
Landform: Nearly level to slightly concave flood plains
Parent material: Clayey or loamy alluvium derived from Permian red beds
Slope: 0 to 1 percent
Elevation: 183 to 305 m (600 to 1,000 feet) above sea level
Climate: Moist subhumid to humid
Mean annual precipitation: 762 to 1,016 mm (30 to 40 inches)
Mean annual air temperature: 13.9 to 17.2 degrees C (57 to 63 degrees F)
Frost free period: 200 to 220 days
Thornthwaite annual P-E index: 56 to 64
Flooding: These soils are subject to occasional or frequent flooding for brief to very long periods during the months of September through June.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Pulaski and Tribbey series. The Pulaski and Tribbey soils are on higher stream flood plains.
DRAINAGE AND PERMEABILITY: Poorly drained; runoff is high on level surfaces and negligible on concave surfaces; permeability is very slow. These soils are occasionally to frequently flooded for brief to very long periods. After being flooded, the soil saturates at the surface, forms a perched water table, and wets deeper over time under sustained inundation.
USE AND VEGETATION: Ustibuck soils were used for growing cotton, soybeans, wheat, grain sorghum, and tame pasture however most fields have been abandoned. Some areas are used for native range, forest, or wildlife. Native vegetation is bottomland hardwoods with an understory of grasses.
DISTRIBUTION AND EXTENT: Central Oklahoma. Land Resource Region M, Cherokee Prairies Major Land Resource Area 112. The series is not extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Okfuskee County, Oklahoma; 1995.
REMARKS: Soil Interpretations Record: Series OK0419
Diagnostic horizons and features recognized in the series type location are:
Ochric epipedon The zone from about 0 to 25 cm (0 to 10 inches)(A horizon)
Cambic horizon - The zone from about 18 to 79 cm (7 to 31 inches)(Bss horizon)
Slickensides The zone from about 25 to 79 cm (10 to 31 inches) (Bss horizon)
Aquic conditions In the form of episaturation the zone from about 0 to 124 cm (0 to 49 inches)(A, Bss, and Cg horizons)
Udic-Ustic moisture regime
Thermic temperature regime
Elevation 183 to 305 m (600 to 1,000 feet) above sea level.