LOCATION KILGORE CO+ID WYEstablished Series
TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, superactive Cumulic Cryaquolls
TYPICAL PEDON: Kilgore silt loam, meadow. (Colors are for dry soils unless otherwise noted.)
A1--0 to 4 inches; very dark grayish brown (10YR 3/2) silt loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable, slightly sticky; plastic; many fine roots and pores; few fine yellowish brown (10YR 5/6) iron concentrations; neutral (pH 7.2); clear smooth boundary. (3 to 7 inches thick)
A2--4 to 16 inches; dark gray (10YR 4/1) silt loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure parting to moderate fine granular; soft, very friable, slightly sticky, and moderately plastic; many fine roots and pores; few fine yellowish brown (10YR 5/6) iron concentrations; slightly alkaline (pH 7.4); clear smooth boundary. (6 to 16 inches thick)
Ag--16 to 25 inches; dark gray (10YR 4/1) silt loam, very dark gray (10YR 3/1) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, and moderately plastic; few fine roots; few fine yellowish brown (10YR 5/6) iron concentrations; slightly alkaline (pH 7.4); clear smooth boundary. (8 to 14 inches thick)
2Cg--25 to 29 inches; dark gray (10YR 4/1) very gravelly sandy loam, dark grayish brown (10YR 4/2) moist; massive, soft, friable, nonsticky, and nonplastic; 25 percent gravel; 5 percent cobbles; common distinct medium yellowish brown (10YR 5/6) iron concentrations; neutral (pH 7.3); clear wavy boundary. (3 to 5 inches thick)
2C--29 to 60 inches; very gravelly loamy sand; single grain, loose; 40 percent gravel, 15 percent cobble; neutral.
TYPE LOCATION: Garfield County, Colorado, on Cattle Creek 1,500 feet east and 500 feet south of the northwest corner, section 8, T. 7 S., R. 87 W.; Carbondale USGS quad; lat. 39 degrees 28 minutes 03 seconds N. and long. 107 degrees 08 minutes 10 seconds W., NAD 27.
RANGE IN CHARACTERISTICS: These soils are noncalcareous to depths of more than 40 inches. Thin organic horizons occur on the surface of some pedons. Depth to the sandy, skeletal substratum ranges from 20 to 40 inches. The upper part of the particle-size control section is silt loam, loam or clay loam, and has 18 to 35 percent clay. Rock fragments in the upper part of the particle-size control section range from 0 to 10 percent and are dominantly of gravel size. The lower part of the particle size control section has 30 to 45 percent gravel and 10 to 20 percent cobble. The solum is slightly acid to slightly alkaline. Mean annual soil temperature ranges from 38 to 42 degrees F. Mean summer soil temperature ranges from 47 to 55 degrees F. The moisture control section is saturated most of the time, but the surface layer may be less than saturated for short periods during late summer.
The A horizons have hue of 5Y through 7.5YR, value of 2 through 4 moist or dry, and chroma of 1 or 2. Faint redox concentrations are common.
The 2C horizon has hue of 5Y through 7.5YR.
COMPETING SERIES: These are the Hovarka and Lemhi series. Hovarka soils have rock fragments of predominantly cobble size in the lower part and border a xeric moisture regime. Lemhi soils have horizons of secondary carbonate accumulations.
GEOGRAPHIC SETTING: Kilgore soils are on floodplains, low terraces and on fans. Slope gradients are 0 to 6 percent. The soils formed in alluvial sediments. At the type location, the precipitation is 16 to 25 inches, with major amounts occurring in late fall and winter as snow. The mean annual temperature is 36 to 41 degrees F and the frost-free season is 30 [TWH1]to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Acree, Cochetopa and Antrobus. All are Cryoborolls with argillic horizons and are well drained.
DRAINAGE AND PERMEABILITY: Poorly drained; medium or slow runoff; moderate permeability.
USE AND VEGETATION: These soils are used as native rangeland and for native hay crops. Principal vegetation is rushes, sedges, redtop, timothy, mountain brome and tufted hairgrass; a few mountain cottonwoods and willows also occur on these soils. The soil is used for oats, alfalfa and barley where it is drained.
DISTRIBUTION AND EXTENT: Mountain areas in Western Colorado, South Central Idaho, and western Montana. LRR E, MLRAs 43, 48A. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Aspen Gypsum Soil Survey Area, Colorado, 1982.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon: from 0 to 25 inches (A1, A2, Ag horizons)
Cumulic feature: irregular decrease in organic carbon is inferred from the landform position.
Lithologic discontinuity: with gravelly sandy alluvium at 25 inches.
Particle-size control section: The zone from 10 to 40 inches (part of A2, Ag, 2Cg, and part of 2C horizons)
This series was proposed in Clark County, Idaho in 1957. The soil is named for a farming community.