LOCATION EASTALL OKEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Ustic Epiaquerts
TYPICAL PEDON: Eastall silty clay--cropland. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 5 inches; grayish brown (10YR 5/2) silty clay, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure parting to moderate medium granular; very hard, firm; common very fine and fine roots; few very fine and fine pores; noneffervescent; slightly alkaline; abrupt smooth boundary.
A--5 to 12 inches; grayish brown (10YR 5/2), interior, and gray (10YR 5/1), exterior, silty clay, very dark grayish brown (10YR 3/2), interior, moist; moderate medium prismatic structure parting to moderate medium subangular blocky; very hard, very firm; common very fine and fine roots; few very fine and fine pores; few fine masses of iron-manganese; noneffervescent; slightly alkaline; clear smooth boundary. (combined thickness of the A horizon ranges from 5 to 18 inches)
Bw--12 to 19 inches; grayish brown (10YR 5/2) clay, very dark grayish brown (10YR 3/2) moist; moderate medium angular blocky structure; very hard, very firm; common very fine and fine roots; common wedge-shaped peds; few distinct pressure faces; few fine masses of iron-manganese; noneffervescent; moderately alkaline; clear smooth boundary. (0 to 16 inches thick)
Bss1--19 to 56 inches; dark grayish brown (10YR 4/2) clay, very dark grayish brown (10YR 3/2) moist; moderate medium angular blocky structure; very hard, very firm; common very fine and fine roots; common wedge-shaped peds; many prominent slickensides; few fine masses of iron-manganese; noneffervescent; moderately alkaline; gradual smooth boundary.
Bss2--56 to 76 inches; brown (7.5YR 5/2) silty clay, brown (7.5YR 4/2) moist; moderate medium subangular blocky structure; very hard, very firm; common very fine and fine roots; common wedge-shaped peds; common prominent slickensides; few fine masses of iron-manganese; slightly effervescent; moderately alkaline; gradual smooth boundary. (combined thickness of the Bss horizon ranges from 27 to 60 inches)
Bkss--76 to 95 inches; brown (7.5YR 5/3) silty clay loam, brown (7.5YR 4/3) moist; moderate medium subangular blocky structure; very hard, firm; common very fine and fine roots; few wedge-shaped peds; few distinct slickensides; few fine masses of iron-manganese; few films, common fine threads, and few fine and medium concretions of calcium carbonate; strongly effervescent; moderately alkaline. (combined thickness of the Bssk horizon ranges from 10 to 40 inches)
TYPE LOCATION: Jackson County, Oklahoma; from the intersection of State Highway 34 and State Highway 6 east of Eldorado; 2.5 miles west on State Highway 6; 0.75 mile north on county road; 2500 feet north in cropland. 2500 feet north and 2100 feet west of the southeast corner of section 34, T.1 N., R.23 W. U.S.G.S. Quadrangle: Prairie Hill, OK; Latitude: 34 degrees, 30 minutes, 50.1 seconds N.; Longitude: 99 degrees, 36 minutes, 12.7 seconds W.
RANGE IN CHARACTERISTICS:
Particle-size control section (weighted average)
Clay content: 40 to 60 percent
Soil Moisture: An aquic soil moisture regime. The soil moisture control section extends approximately 4 to 12 inches below the soil surface.
Solum thickness: 60 to more than 80 inches
Depth to secondary calcium carbonate: 30 to 80 inches
Depth to redox concentrations: 0 to 20 inches
Depth to episaturation: 0 to 20 inches
Depth to slickensides: 6 to 20 inches
COLE: dominantly more than 0.09 but ranges to 0.07
Cracks: 0.4 to 2 inches or more wide extend from the surface to a depth of 40 inches or more for 90 or more cumulative days during most years.
This is a cyclic soil and most undisturbed areas have gilgai microrelief with microknolls 3 to 6 inches higher than microdepressions. Distance between the center of the microknoll and the center of the microdepression is about 5 to 15 feet. The microknoll makes up about 20 percent, the microdepression about 40 percet, and the intermediate area between high and low about 40 percent.
A Horizon
Hue: 10YR or 2.5Y
Value: 3 to 5, 2 to 4 moist
Chroma: 2 or less
Texture: silty clay or clay
Redox accumulations: none to common, fine concretions or masses of iron-manganese
Calcium carbonate equivalent: 0 to 2 percent
Effervescence: noneffervescent to slightly effervescent
Reaction: neutral to moderately alkaline
Bw Horizon (where present)
Hue: 10YR or 2.5Y
Value: 3 to 5, 2 to 4 moist
Chroma: 2 or less
Texture: silty clay or clay
Redox accumulations: none to common, fine concretions or masses of iron-manganese
Calcium carbonate equivalent: 0 to 2 percent
Effervescence: noneffervescent to slightly effervescent
Reaction: slightly alkaline or moderately alkaline
Bss Horizon
Hue: 10YR to 5Y
Value: 4 to 6, 3 to 5 moist
Chroma: 2 or less
Texture: silty clay or clay
Redox accumulations: none to common, fine concretions or masses of iron-manganese
Calcium carbonate equivalent: 0 to 5 percent
Identifiable secondary carbonate: none to a few fine concretions
Effervescence: noneffervescent to strongly effervescent
Reaction: slightly alkaline or moderately alkaline
Bkss, Bk, or BC Horizons
Hue: 7.5YR to 2.5Y
Value: 4 to 7, 3 to 6 moist
Chroma: 1 to 4
Texture: clay loam, silty clay loam, silty clay or clay
Redox accumulations: none to common, fine concretions or masses of iron-manganese
Calcium carbonate equivalent: 2 to 15 percent
Identifiable secondary carbonate: few to common, concretions and/or masses
Effervescence: very slightly effervescent to strongly effervescent
Reaction: moderately alkaline
COMPETING SERIES: These are the
Ranco,
Randall,
Rosston, and
Ustibuck series in the same family.
Ranco and Randall soils formed in lacustrine sediments derived from eolian materials and are associated with soils in a dryer climate on the Southern
High
plains(MLRA 77C).
Rosston soils formed in lacustrine sediments derived from Pliocene age materials and have a slightly cooler temperature regime and dryer climate on the Southern High Plains Breaks(MLRA 77E).
In addition, Ranco, Randall, and Rosston soils are associated with soils that have an aridic-ustic soil moisture regime.
Ustibuck soils have hue of 7.5YR or redder throughout, are in a more moist climate, and are in flood plains.
GEOGRAPHIC SETTING:
Parent material: clayey lacustrine sediments of Pleistocene age
Landform: enclosed depressional areas or playa floor 3 to 15 feet below the surrounding plain and range in size from 3 to 30 or more acres.
Slope: 0 to 1 percent with concave surfaces
Mean annual air temperature range: 59 to 64 degrees F.
Mean annual precipitation range: 21 to 28 inches
Frost-free period: 200 to 230 days
Elevation: 1000 to 2200 feet
Thornthwaite annual P-E indices: 32 to 44
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Abilene,
Hollister,
La Casa,
Lazare,
Nipsum,
Rotan,
Rowena, and
Sagerton series.
Abilene, La Casa, Rotan, and Sagerton soils have an agrillic horizon and are on higher well drained areas.
Nipsum and Rowena soils have a cambic horizon without slickensides and are on higher well drained areas.
Hollister soils are on higher well drained areas.
Lazare soils are in slight depressions that pond water for less than 7 days following heavy rains.
DRAINAGE AND PERMEABILITY: Poorly drained. Permeability is very slow. Runoff is negligible. Frequent ponding, up to 36 inches deep, occurs for long to very long periods (7 days to 6 months), with a zone of episaturation which extends from the surface to a depth of 12 to 36 inches below the surface during the months of April thru November of most years.
USE AND VEGETATION: Most areas are used for rangeland. Some areas that were cropped have been returned to pasture. During periods of below normal rainfall some areas are cropped to wheat, cotton, and grain sorghum. Native vegetation is buffalograss, vine mesquite, white tridens, panicums, sedges, Pennsylvania smartweed, evening primrose, cocklebur, and wooly leaf bursage.
DISTRIBUTION AND EXTENT: Central Rolling Red Plains of north central Texas and southwestern Oklahoma LRR H (MLRA-78). The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas.
SERIES ESTABLISHED: Jackson County, Oklahoma; 2000.
REMARKS: These soils were previously included with the Randall, Roscoe, and Lipan series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 56 inches (Ap, A, Bw, Bss horizons).
Episaturation - soil is saturated with water in one or more layers within 80 inches with one or more unsaturated layers with an upper boundary above 80 inches.
Aquic feature - periodic saturation and reduction.
Vertisol feature: slickensides and wedge-shaped aggregates from 19 to 76 inches. Cracks that are open 90 or more cumulative days in most years. Gilgai microrelief is on most undisturbed areas.
Redoximorphic feature: Redox concentration - zone of apparent accumulation of iron oxides. Redox depletion - zone of low chroma, 2 or less where iron oxides have been removed.
Range Site: Lakebed - 078BY078TX; 078CY102TX.
ADDITIONAL DATA: NSSL data from Jackson County, OK (S98OK-065-003)
TAXONOMIC VERSION: Soil Taxonomy, Second Edition, 1999.