LOCATION OZARK              OK
Established Series
Rev. CRC-RFG-CLN:WJG
02/2007

OZARK SERIES


The Ozark series consists of very deep, moderately well drained, moderately slowly permeable soils that formed in loamy alluvium over residuum from redbed clays and claystones of Permian age. These nearly level or very gently sloping soils are on treads and interdunal areas of sand sheets on stream terraces on alluvial plains. Slope ranges from 0 to 3 percent. Mean annual temperature is about 62 degrees F., and mean annual precipitation is about 26 inches.

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.


National Cooperative Soil Survey
U.S.A.