LOCATION OZARK OKEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, thermic Typic Argiustolls
TYPICAL PEDON: Ozark fine sandy loam--on 0.3 percent slope in improved pasture. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 11 inches; brown (10YR 4/3) fine sandy loam, dark brown (10YR 3/3) moist; moderate medium granular structure; slightly hard, very friable; many very fine, fine, and common medium roots; common fine and medium pores; noneffervescent; neutral; clear smooth boundary. (7 to 18 inches thick)
Bt--11 to 24 inches; 60 percent reddish brown (5YR 5/4) and 40 percent reddish yellow (5YR 6/8) sandy clay loam, reddish brown (5YR 4/4) and yellowish red (5YR 5/8) moist; moderate coarse prismatic structure parting to moderate medium subangular blocky; hard, friable; common very fine, fine, and few medium roots; common very fine and fine pores; many distinct clay films on surfaces of peds; few fine iron-manganese concretions; few rounded gravel; noneffervescent; slightly alkaline; clear smooth boundary. (8 to 49 inches thick)
Btk1--24 to 39 inches; 55 percent red (2.5YR 5/8) and 40 percent red (2.5YR 4/6) clay loam, red (2.5YR 4/8) and dark red (2.5YR 3/6) moist; moderate coarse prismatic structure parting to moderate medium subangular blocky; very hard, firm; common very fine and fine roots; common very fine and few fine pores; many distinct clay films on surfaces of peds; few fine iron-manganese concretions; common medium prominent pale brown (10YR 6/3) iron depletions; common fine and medium masses and few fine and medium calcium carbonate concretions; very slightly effervescent; moderately alkaline; gradual smooth boundary. (The combined thickness of the Btk horizons ranges from 10 to 40 inches thick)
Btk2--39 to 50 inches; red (2.5YR 5/6) clay loam, red (2.5YR 4/6) moist; moderate coarse prismatic structure parting to moderate medium subangular blocky; very hard, firm; few very fine and fine roots; few very fine and fine pores; common distinct clay films on surfaces of peds; common fine and medium iron-manganese concretions; common fine prominent light greenish gray (5GY 7/1) iron depletions; few fine and medium calcium carbonate concretions; few films of calcium carbonate on surfaces of peds; few masses of salt; slightly effervescent; moderately alkaline; gradual smooth boundary.
Btk3--50 to 59 inches; red (2.5YR 5/6) clay loam, red (2.5YR 4/6) moist; moderate coarse prismatic structure parting to moderate medium subangular blocky; very hard, firm; few very fine and fine roots; few very fine and fine pores; common distinct clay films on surfaces of peds; common fine and medium iron-manganese concretions; common fine prominent light greenish gray (5GY 7/1) iron depletions and common fine and medium faint red (2.5YR 5/8) iron concentrations; few fine and medium concretions and few films of calcium carbonate on surfaces of peds; few masses of salt; slightly effervescent; moderately alkaline; gradual smooth boundary.
BC--59 to 83 inches; red (2.5YR 5/8) sandy clay loam, red (2.5YR 4/8) moist; weak coarse and very coarse prismatic structure; hard, friable; very few very fine and fine roots; few very fine and fine pores; common fine and medium iron-manganese concretions; few films of calcium carbonate on surfaces of peds; slightly effervescent; moderately alkaline; gradual wavy boundary. (0 to 30 inches thick)
2C--83 to 105 inches; red (2.5YR 5/8) stratified clay loam, red (2.5YR 4/8) moist; massive; slightly effervescent; moderately alkaline; abrupt smooth boundary. (0 to 50 inches thick)
2Cd--105 to 110 inches; red (2.5YR 4/6) clay densic claystone with few greenish gray spots; very slightly effervescent; slightly alkaline.
TYPE LOCATION: Jackson County, Oklahoma; from the intersection of U. S. Highway 62 and 283 in Altus; 6.0 miles east on U. S. Highway 62; 4.0 miles north and 0.6 mile east on county road; 500 feet north in pasture. (500 feet north and 2,000 feet west of the southeast corner of section 29, T. 3 N., R. 19 W). USGS quad: Headrick (Latitude: 34 degrees, 41 minutes, 49 seconds N; Longitude: 99 degrees, 13 minutes, 3 seconds W).
RANGE IN CHARACTERISTICS:
Particle-size control section (weighted average)
Clay content: 20 to 35 percent
CEC/clay ratio: 0.4 to 0.6
Thickness of the solum: 60 to more than 80 inches
Thickness of the mollic epipedon: 10 to 20 inches
Depth to a lithologic discontinuity: 60 to typically more than 80 inches
Depth to secondary calcium carbonate: 10 to 50 inches
Depth to a perched water table: 40 to 60 inches, mainly from October to May.
A saline phase is recognized for pedons that have electrical conductivity that ranges from 4 to 25 dS/m in the surface layer and a pH range to strongly alkaline in horizons below the surface.
A Horizon
Hue: 5YR to 10YR
Value: 4 or 5 (3 or 4 moist)
Chroma: 2 or 3
Texture: fine sandy loam or sandy loam
Effervescence: Noneffervescent
Reaction: Slightly acid to slightly alkaline
Upper Bt Horizon
Hue: 5YR to 7.5YR
Value: 4 to 6 (3 to 5 moist)
Chroma: 3 to 6
Texture: sandy clay loam or clay loam
Clay content: 20 to 35 percent
Effervescence: Noneffervescent to slightly effervescent
Reaction: Neutral to slightly alkaline
Lower Bt and Btk Horizons
Hue: 2.5YR to 10YR
Value: 4 to 6 (3 to 5 moist)
Chroma: 2 to 6
Texture: clay loam, sandy clay loam, loam, sandy clay, or clay
Clay content: 20 to 45 percent
Redox depletions: Some pedons have light gray iron depletions below 30 inches.
Calcium carbonate equivalent: 0 to 15 percent
Gypsum: Some pedons contain up to 3 percent crystals of gypsum or other salts.
EC (dS/m): 0 to 4
SAR: 0 to 12
Effervescence: Noneffervescent to strongly effervescent
Reaction: Slightly alkaline to moderately alkaline
BC and C Horizons (where present)
Hue: 2.5YR to 10YR
Value: 4 to 6 (3 to 5 moist)
Chroma: 2 to 6
Texture: clay loam, sandy clay loam, fine sandy loam, or loam
Clay content: 8 to 35 percent
Redox depletions: Some pedons have light gray iron depletions.
Calcium carbonate equivalent: 2 to 10 percent
Gypsum: Some pedons contain up to 3 percent crystals of gypsum or other salts.
EC (dS/m): 0 to 4
SAR: 0 to 12
Effervescence: Very slightly effervescent to strongly effervescent
Reaction: Moderately alkaline
2BC or 2C Horizons
Hue: 2.5YR or 5YR
Value: 4 or 5 (3 or 4 moist)
Chroma: 4 to 6
Texture: Clay loam, silty clay loam, silty clay, or clay that has weathered form Permian age redbed sediments.
Clay content: 30 to 50 percent
Calcium carbonate equivalent: 2 to 15 percent
EC (dS/m): 0 to 4
SAR: 0 to 12
Effervescence: Very slightly effervescent to strongly effervescent
Reaction: Moderately alkaline
2Cd Horizon (where present)
Hue: 2.5YR or 5YR
Value: 3 to 5
Chroma: 4 to 6
Texture: Red and bluish gray noncemented siltstone and claystone of Permian age redbeds that has clay or silty clay texture.
Depth to this horizon is variable and ranges from 5 to 12 feet from the surface.
Clay content: 40 to 60 percent
Calcium carbonate equivalent: 1 to 8 percent
EC (dS/m): 1 to 8
Gypsum: 0 to 2 percent
SAR: 0 to 8
Effervescence: Noneffervescent to slightly effervescent
Reaction: Slightly alkaline or moderately alkaline
COMPETING SERIES: These are the Farry, Madge, and Ost series.
These soils all are well drained, do not have discontinuities, and do not have wetness features above a depth of 6 feet.
GEOGRAPHIC SETTING:
Parent material: loamy alluvium of Pleistocene age over residuum from silty or clayey redbeds of Permian age.
Landform: treads and interdunal areas of sand sheets on stream terraces on alluvial plains
Slope: 0 to 3 percent
Mean annual air temperature range: 59 to 64 degrees F.
Mean annual precipitation range: 20 to 28 inches
Frost-free period: 200 to 230 days
Elevation: 1000 to 2100 feet
Thornthwaite annual P-E indices: 32 to 44
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Devol, Eda, Grandfield, Grandmore, and Roark series.
Devol, Eda, and Grandfield series: These soils occur on slightly higher areas, have less clay in the particle-size control section, and have an ochric epipedon.
Grandmore series: These soils occur on similar landscape positions and have an ochric epipedon.
Roark series: These soils occur on similar landscape positions, have a fine textured particle-size control section and have a mollic epipedon more than 20 inches thick.
DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is moderately slow. Runoff is low on 0 to 1 percent slopes and medium on 1 to 3 percent slopes. This soil has episaturation (perched water table) which occurs at a depth of 3.5 to 5.0 feet from the surface, mainly during October to May.
USE AND VEGETATION: Most areas are used for cropland or pasture. Main crops are wheat, cotton, grain sorghum, and alfalfa. Native vegetation is mid and tall prairie grasses.
DISTRIBUTION AND EXTENT: Central Rolling Red Plains of southwestern Oklahoma and northwestern Texas; LRR H; MLRA 78; Moderate extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Jackson County, OK, 2000
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon--0 to 11 inches (Ap horizon).
Argillic horizon--11 to 59 inches (Bt & Btk horizons).
The assignment of the cation-exchange activity class is based on lab data from Jackson County, OK.
Range Site: Sandy Loam Prairie PE 31-44 (078CY110TX).
ADDITIONAL DATA: NSSL data Jackson County, Oklahoma (S96OK-065-002).
TAXONOMIC VERSION: Soil Taxonomy, Second Edition, 1999.