LOCATION HARGREAVE WY+UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aridic Argiustolls
TYPICAL PEDON: Hargreave fine sandy loam, grassland. (Colors are for dry soil unless otherwise stated.)
A--0 to 6 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate very fine granular structure; soft, very friable; neutral (pH 7.0); clear smooth boundary. (5 to 7 inches thick)
BA--6 to 10 inches; brown (10YR 5/3) heavy fine sandy loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure that parts to moderate fine granular; slightly hard, very friable; very few faint clay films on faces of peds and as coatings on sand grains; neutral (pH 7.2); clear smooth boundary. (0 to 5 inches thick)
Bt--10 to 20 inches; brown (10YR 5/3) sandy clay loam, dark brown (10YR 4/3) moist; moderate medium prismatic structure that parts to moderate medium subangular blocky; hard, friable; many prominent clay films on faces of peds and on the inside of root channels; neutral (pH 7.2); gradual smooth boundary. (7 to 13 inches thick)
BC--20 to 24 inches; brown (10YR 5/3) heavy fine sandy loam, dark brown (10YR 4/3) moist; weak medium prismatic structure that parts to weak medium subangular blocky; hard, very friable; few faint clay films on faces of peds and as coatings on the inside of root channels; mildly alkaline (pH 7.6); gradual wavy boundary. (3 to 5 inches thick)
C--24 to 32 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 5/3) moist; massive; slightly hard, very friable; 5 percent sandstone fragments; mildly alkaline (pH 7.6); gradual wavy boundary. (5 to 25 inches thick)
Cr--32 to 60 inches; soft, noncalcareous sandstone.
TYPE LOCATION: Goshen County, Wyoming; .3 mile west of NE corner of sec. 6, T.30N., R.62W.
RANGE IN CHARACTERISTICS: The mollic epipedon is 7 to 19 inches thick. Depth to bedrock ranges from 20 to 40 inches. The argillic horizon is more than 6 inches thick and its lower boundary extends below 10 inches. Usually these soils are noncalcareous throughout but are inconsistently calcareous just above the bedrock in some pedons. Organic carbon content of the mollic epipedon ranges from .6 to 2 percent and decreases uniformly with increasing depth. Coarse fragments usually are less than 10 percent in the solum and C horizon but in some pedons ranges to 35 percent cobbles and pebbles in the upper part of the profile. Mean annual soils temperature ranges from 47 degrees to 53 degrees F.
The A horizon has hue of 5Y through 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3. It usually has granular structure but it has subangular blocky structure in some pedons. This horizon is soft to slightly hard. It is slightly acid through mildly alkaline.
The Bt horizon has hue of 5Y through 7.5YR, value of 4 through 7 dry, 3 through 6 moist, and chroma of 2 through 6. It usually has prismatic structure but it has subangular blocky structure in some pedons. This horizon is typically sandy clay loam but clay ranges from 18 to 35 percent, silt from 5 to 40 percent, and sand from 40 to 75 percent with more than 35 percent fine or coarser sand. It is slightly acid through mildly alkaline.
The C horizon has hue of 5Y through 7.5YR, value of 5 through 7 dry, 4 through 6 moist, and chroma of 2 through 4. It is slightly acid through moderately alkaline. The higher reactions are due to discontinuous carbonates immediately above the bedrock.
COMPETING SERIES: These are the Ascalon, Asparas, Belfon, Bresser, Capulin, Cedak, Chacuaco(T), Critchell, Dagflat, Datil, Featherlegs, Forgan, Harlan, Hemmingford, Hiarc, Kirtley, Lavate, Loarc, Moskee, Noden, Palmer Canyon, Recluse, Rosebud, Ryegate, Satanta, Shalona, Sitcan, Sugardee, Wages, and Wolf series. The Ascalon, Asparas, Belfon, Bresser, Capulin, Critchell, Datil, Featherlegs, Forgan, Harlan, Lavate, Lorac, Moskee, Noden, Palmer Canyon, Recluse, Satanta, Shalona, Sitcan, Sugardee, Wages, and Wolf series are greater than 60 inches deep. The Cedak, Hemmingford, Ryegate, and Rosebud soils have Bk horizons or continuous horizons containing free carbonates. The Chacuaco, Dagflat and Hiarc soils have a lithic contact at 20 to 40 inches. The Kirtley soils have hue of 2.5YR or 5YR.
GEOGRAPHIC SETTING: Hargreave soils are on nearly level to moderately sloping uplands. Slopes typically range from 0 to about 15 percent. These soils formed in noncalcareous materials weathered residually from soft, noncalcareous sandstone. Elevations are 3,500 to 5,500 feet. The mean annual precipitation is 12 to 19 inches with peak periods of precipitation in the spring and early summer. Mean annual temperature is 50 degrees F. Frost-free season ranges from 105 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Trelona and Torrington soils. Trelona soils lack an argillic horizon and have bedrock above 20 inches. Torrington soils have less than 18 percent clay in the argillic horizon.
DRAINAGE AND PERMEABILITY: Well-drained; medium runoff; moderate permeability.
USE AND VEGETATION: The soils are used as native pastureland and dry or irrigated cropland. Native vegetation is blue grama, buffalo grass, needleandthread, western wheatgrass, sage, and cactus.
DISTRIBUTION AND EXTENT: Wyoming, Colorado, and eastern Nebraska. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Boulder Area, Colorado; 1976.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Mollic epipedon - 0 to 10 inches (A,AB)
2. Argillic horizon - 10 to 20 inches (Bt)
3. Paralithic contact - 32 inches (Cr)
4. This soil is usually dry, but is moist in some or all parts of the moisture control section for more than 40 cumulative days from May 15 to July 15 in most years.