LOCATION COKEVILLE IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Calcic Haploxeralfs
TYPICAL PEDON: Cokeville gravelly loam, rangeland-on a southwest facing convex slope of 25 percent at an elevation of 6660 feet. (Colors are for dry soil unless otherwise stated. When described on October 11, 1983, the soil was moist to a depth of 18 inches.)
A--0 to 2 inches; brown (7.5YR 4/4) gravelly loam, dark brown (7.5YR 3/4) moist; moderate fine and medium platy structure parting to moderate fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; many fine irregular pores; 20 percent gravel and 5 percent cobbles; slightly effervescent; slightly alkaline (pH 7.6); abrupt smooth boundary. (1 to 3 inches thick)
BA--2 to 5 inches; reddish brown (5YR 5/4) gravelly silt loam, dark reddish brown (5YR 3/4) moist; strong fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; many fine irregular and many very fine and fine tubular pores; 15 percent gravel; slightly effervescent; slightly alkaline (pH 7.8); abrupt wavy boundary. (2 to 4 inches thick)
Bt--5 to 9 inches; reddish brown (5YR 5/4) gravelly clay loam, yellowish red (5YR 4/6) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine, fine and medium roots; common fine irregular and tubular pores; common faint discontinuous clay films on faces of peds and in pores; 15 percent gravel; strongly effervescent (non-effervescent in areas of clay films); moderately alkaline (pH 8.0); clear wavy boundary. (4 to 8 inches thick)
Btk1--9 to 15 inches; reddish brown (5YR 5/4) gravelly loam, yellowish red (5YR 4/6) moist; moderate fine and medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine, fine and medium roots; many very fine and fine tubular pores; common faint discontinuous clay films on faces of peds and in pores; common irregular fine carbonate threads; 25 percent gravel; strongly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 10 inches thick)
Btk2--15 to 31 inches; yellowish red (5YR 5/6) gravelly silt loam, yellowish red (5YR 4/6) moist; moderate fine and medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; many very fine tubular pores; few faint discontinuous clay films on faces of peds and in pores; few irregular fine masses of carbonate, many irregular fine carbonate threads; 25 percent gravel; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary. (12 to 20 inches thick)
Btk3--31 to 43 inches; reddish yellow (5YR 6/6) gravelly silty clay loam, yellowish red (5YR 4/6) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; few very fine and fine roots; many very fine tubular pores; common faint discontinuous clay films on faces of peds and in pores; few irregular fine masses of carbonate, many irregular fine carbonate threads; 30 percent gravel; strongly effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary. (8 to 15 inches thick)
2Bk--43 to 56 inches; red (2.5YR 4/6) silty clay loam, dark red (2.5YR 3/6) moist; moderate fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine irregular pores; common soft lime veins and masses; strongly effervescent; moderately alkaline (pH 8.4); clear wavy boundary. (8 to 15 inches)
2Cr--56 inches; reddish brown (2.5YR 5/4) weathered sandstone; crushes to sandy loam, reddish brown (2.5YR 4/4) moist.
TYPE LOCATION: Bear Lake County, Idaho; about 6 miles south of Pegram, Idaho; about 50 feet north and 900 feet east of the southwest corner, sec. 15, T. 16S., R 46E.; latitude 42 degrees, 01 minutes, and 30 seconds N., longitude 111 degrees, 4 minutes, and 7 seconds W.
RANGE IN CHARACTERISTICS:
Soil moisture - usually moist, but are dry in the soil moisture control section for 45 consecutive days or more following the summer solstice. Xeric moisture regime
Average annual soil temperature - 39 to 46 degrees F. Frigid soil temperature regime.
Depth to paralithic contact: 40 to 60 inches
Depth to calcic horizon: 7 to 15 inches
Particle-size control section: 18 to 35 percent clay
Rock fragment: 15 to 35 percent gravel
A horizon
Hue: 5YR or 7.5YR
Value: 4 through 6 dry, 3 through 5 moist
Chroma: 3 through 6 dry or moist
Clay content: 15 to 23 percent
Rock fragments: 15 to 25 percent-15 to 25 percent gravel, 0 to 5 percent cobbles
Reaction: slightly or moderately alkaline
BA horizon
Hue: 5YR or 7.5YR
Value: 4 through 6 dry, 3 through 5 moist
Chroma: 3 through 6 dry or moist
Texture: gravelly silt loam, gravelly loam
Clay content: 15 to 23 percent
Rock fragments: 15 to 25 percent-15 to 25 percent gravel, 0 to 5 percent cobbles
Reaction: slightly or moderately alkaline
Bt horizon
Hue: 2.5YR or 5YR
Value: 5 or 6 dry, 4 through 6 moist
Chroma: 4 through 6 dry or moist
Texture: gravelly clay loam, gravelly silty clay loam
Clay content: 27 to 35 percent
Rock fragments: 15 to 35 percent gravel
Reaction: slightly or moderately alkaline
Btk horizons
Hue: 2.5YR or 5YR
Value: 5 or 6 dry, 4 through 6 moist
Chroma: 3 through 6 dry or moist
Texture: gravelly loam, gravelly silty clay loam, gravelly silt loam
Clay content: 18 to 35 percent
Rock fragments: 15 to 35 percent gravel
Calcium carbonate equivalent: 15 to 40 percent
Reaction: slightly or moderately alkaline
2Bk horizon
Hue: 2.5YR or 5YR
Value: 4 through 6 dry, 3 through 6 moist
Chroma: 3 through 6 dry or moist
Texture: silty clay loam or clay loam
Clay content: 34 to 40 percent
Rock fragments: 0 to 10 percent gravel
Calcium carbonate equivalent: 20 to 40
Reaction: slightly to moderately alkaline
COMPETING SERIES: This is the Slan series. Slan soils are moderately deep to a paralithic contact.
GEOGRAPHIC SETTING:
Landform: hillslopes and mountain slopes
Elevation: 6,200 to 7,700 feet
Slope: 5 to 35 percent
Parent material: alluvium and residuum from sandstone and conglomerate material
Climate: long, cool winters; moist springs, and dry, warm summers.
Average annual precipitation: 13 to 18 inches
Mean annual temperature: 37 to 45 degrees F.
Frost-free period: 70 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Boundridge, Warshod, Pontuge and Slan series. The Boundridge soil has a duripan, is shallow, and is loamy-skeletal. Boundridge soils form in alluvium from sandstone and quartzite on ridge tops and on terrace summits. Warshod soils have a pachic mollic epipedon, a cryic soil temperature regime, and is loamy-skeletal on hillsides and terrace sides. The Pontuge series is moderately deep, and has a pachic mollic epipedon on shoulders and backslopes of hills. The Slan series are moderately deep to a paralithic contact on upper backslopes and shoulders of hills.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability; and rapid or very rapid runoff.
USE AND VEGETATION: These soils are used for rangeland and wildlife habitat. The dominant native species are mountain big sagebrush, bluebunch wheatgrass, Nevada bluegrass, Indian ricegrass, arrowleaf balsamroot, and prairie junegrass.
DISTRIBUTION AND EXTENT: This series is not extensive (less than 10,000 acres) in Southeast Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bear Lake County, Idaho, 2008.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon- the zone from the soil surface to 5 inches (A and BA horizons)
Argillic horizon - the zone from 5 to 43 inches (Bt, Btk1, Btk2, and Btk3 horizons)
Calcic horizon - the zone from 9 to 56 inches (Btk1, Btk2, Btk3, and 2Bk horizons)