LOCATION CEDARHILL IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Calcixerolls
TYPICAL PEDON: Cedarhill very cobbly silt loam - on a 32 percent south slope in rangeland at 5,000 feet elevation. (Colors are for air dry soil unless otherwise stated. When described on June 8, 1978, the soil was dry to 4 inches and moist below.)
A--0 to 4 inches; brown (10YR 5/3) very cobbly silt loam, very dark grayish brown (10YR 3/2) moist; weak coarse and medium subangular blocky structure parting to weak fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine and fine, common medium, and few coarse roots; many very fine irregular pores; about 5 percent stones, 20 percent cobbles, and 15 percent gravel; slightly effervescent; slightly alkaline (pH 7.7); clear smooth boundary. (2 to 7 inches thick)
ABk--4 to 9 inches; brown (10YR 5/3) very cobbly silt loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure parting to weak fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine and fine, common medium, and few coarse roots; many very fine irregular pores; about 5 percent stones, 20 percent cobbles, and 5 percent gravel; strongly effervescent; slightly alkaline (pH 7.7); clear wavy boundary. (3 to 7 inches thick)
Bk1--9 to 16 inches; very pale brown (10YR 7/3) very cobbly silt loam, light yellowish brown (10YR 6/4) moist; weak coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; many very fine and fine, common medium, and few coarse roots; many very fine tubular pores; about 5 percent stones, 20 percent cobbles, and 15 percent gravel; violently effervescent; slightly alkaline (pH 7.8); gradual wavy boundary. (5 to 15 inches thick)
Bk2--16 to 28 inches; light yellowish brown (10YR 6/4) very cobbly silt loam, dark yellowish brown (10YR 4/4) moist; weak coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine and fine and few medium and coarse roots; many very fine tubular pores; about 5 percent stones, 20 percent cobbles, and 20 percent gravel; violently effervescent; slightly alkaline (pH 7.8); gradual wavy boundary. (10 to 20 inches thick)
C--28 to 60 inches; light yellowish brown (10YR 6/4) very cobbly loam, dark yellowish brown (10YR 4/4) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine, fine and medium roots; many very fine tubular pores; about 5 percent stones, 20 percent cobbles, and 20 percent gravel; slightly effervescent; moderately alkaline (pH 7.9).
TYPE LOCATION: Bannock County, Idaho; about 4 miles south of Pocatello; 1,750 feet north and 250 feet east of the southwest corner, sec. 20, T. 7 S., R. 35 E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 43 to 47 degrees F
Thickness of mollic epipedon - 7 to 13 inches
Depth to calcic horizon - 7 to 13 inches
Particle-size control section
Clay content - 8 to 17 percent
Rock fragments - 40 to 70 percent
A horizon
Color value, dry - 4 or 5
Value, moist - 2 or 3
Chroma, dry or moist - 2 or 3
Reaction - neutral to moderately alkaline
Bk horizon
Color value, dry -5 through 8
Value, moist - 3 through 8
Chroma, dry - 1 through 4
Chroma, moist - 2 through 4
Reaction - slightly alkaline or moderately alkaline
Calcium carbonate content - 15 to 35 percent
Texture - CBV-SIL, CBX-SIL, GRV-SIL, GRX-SIL, GRV-L, GRX-L, GR-L, CBX-L
Rock fragments - 30 to 70 percent
C horizon
Color value, dry - 6 through 8
Value, moist - 4 through 6
Chroma, dry - 2 through 4
Chroma, moist - 3 or 4
Reaction - slightly alkaline or moderately alkaline
Texture - CBV-SIL, CBX-SIL,CBV-L, GRX-L, GRX-SIL, GRV-SIL, CBX-L, GRV-L
Rock fragments - 45 to 90 percent
COMPETING SERIES: These are the Bezzant, Dennot, Georgecanyon (T) and Pyrenees (T) series. Bezzant soils average 18 to 35 percent clay in the texture control section. Dennot soils have hue of 2.5YR, 5YR, or 7.5YR. Georgecanyon soils have 25 to 35 percent clay in the particle-size control section. Pyrenees soils are moderately deep to bedrock.
GEOGRAPHIC SETTING: Cedarhill soils are generally on south and west-facing mountain slopes and ridges, foothills, and terraces. Slopes range from 4 to 60 percent. Elevation is 4,800 to 7,000 feet. These soils formed in alluvium and colluvium derived dominantly from limestone and related sedimentary and metasedimentary rocks. The mean annual temperature is 41 to 45 degrees F, and the mean annual precipitation is 13 to 18 inches. The frost-free season is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hondoho, Ireland, Ricrest, Ridgecrest, Ririe, and Watercanyon soils. Hondoho soils are noncalcareous in the A horizon or at least its upper part. Ireland and Ridgecrest soils have bedrock at 20 to 40 inches. Ricrest soils are fine-loamy. Watercanyon and Ririe soils formed in loess and are coarse-silty. Hondoho and Ricrest soils are in concave positions or on north and east-facing slopes when associated with Cedarhill soils. Ridgecrest and Ireland soils are generally on north or east convex slopes when associated with Cedarhill soils. Ririe and Watercanyon soils are on loess covered slopes and fan terraces.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow to very rapid; permeability is moderate.
USE AND VEGETATION: These soils are used mainly for rangeland, wildlife habitat, watershed, and cropland. Important native plants are Utah juniper, mountain big sagebrush, arrowleaf balsamroot, bluebunch wheatgrass, and Indian ricegrass. The dominant crops are dryland wheat and alfalfa.
DISTRIBUTION AND EXTENT: Mountainous areas of southeastern Idaho. This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Bannock County, Idaho, 1983.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 9 inches (A and ABk horizons).
Calcic horizon - The zone from 9 to 28 inches (Bk1 and Bk2 horizons).
Particle-size control section - The zone from 10 to 40 inches (part of the Bk1, the Bk2, and part of the C horizons).