LOCATION CRUMLEY IDEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed, frigid Ultic Haploxerolls
TYPICAL PEDON: Crumley fine gravelly sandy loam, forested -- on a north-facing slope of 50 percent at 5,500 feet elevation. When described on September 11, 1995, the soil was dry throughout. (Colors are for air-dry soil unless otherwise noted.)
Oi--0 to 2 inches; slightly decomposed forest litter.
A1--2 to 4 inches; dark grayish brown (10YR 4/2) fine gravelly sandy loam, very dark brown (10YR 2/2) moist; weak medium granular structure; soft, very friable, nonsticky and slightly plastic; many very fine and fine, common medium and coarse roots; many very fine, fine and medium irregular and tubular pores; 30 percent gravel; slightly acid (pH 6.1); clear smooth boundary.
A2--4 to 12 inches; grayish brown (10YR 5/2) fine gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; many very fine and fine, common medium and coarse roots; common very fine, fine and medium irregular and tubular pores; 30 percent gravel; moderately acid (pH 6.0); clear wavy boundary. (combined A horizon - 10 to 20 inches thick)
Bw--12 to 18 inches; brown (10YR 5/3) very gravelly sandy loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and fine, few medium and coarse roots; common very fine, fine and medium irregular and tubular pores; 50 percent gravel; moderately acid (pH 5.9); clear irregular boundary. (4 to 15 inches thick)
2C1--18 to 30 inches; pale yellow (2.5Y 7/4) extremely gravelly loamy sand, light olive brown (2.5Y 5/4) moist; massive; soft, very friable, nonsticky and nonplastic; common very fine and fine, few medium and coarse roots; common very fine, fine and medium irregular and tubular pores; 5 percent cobbles, 70 percent gravel; strongly acid (pH 5.4); gradual wavy boundary.
2C2--30 to 60 inches; pale yellow (2.5Y 7/4) and olive yellow (2.5Y 6/6) extremely gravelly loamy sand, light yellowish brown (2.5Y 6/4) moist massive; soft, very friable, nonsticky and nonplastic; few very fine, fine, medium and coarse roots; few very fine, fine and medium irregular and tubular pores; 60 percent gravel; strongly acid (pH 5.4).
TYPE LOCATION: Ada County, Idaho; about 6 miles east of Boise; 1,150 feet north and 2,450 feet east of the southwest corner of section 2, T.3 N., R.3 E.; USGS Lucky Peak Quadrangle; Latitude - 43 degrees, 37 minutes, 16 seconds N. and Longitude - 116 degrees, 03 minutes, 56 seconds W.; NAD 83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 10 to 20 inches
Depth to sandy-skeletal material - 14 to 25 inches
Depth to bedrock - greater than 60 inches
Base saturation - 50 to 75 percent
Particle-size control section - 3 to 7 percent clay; 35 to 75 percent rock fragments
Moisture control section - dry 45 to 75 days consecutive following the summer solstice
Average annual soil temperature - 42 to 47 degrees F.
A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Rock fragments - 0 to 5 percent cobbles, 15 to 35 percent gravel and 15 to 35 percent total
Reaction - moderately acid through neutral
Bw horizon
Value - 5 or 6 dry, 3 or 4 moist
Texture - SL or COSL
Clay content - 7 to 14 percent
Rock fragments - 0 to 10 percent cobbles, 15 to 50 percent gravel and 25 to 50 percent total
Reaction - moderately acid or slightly acid
2C horizon
Hue - 10YR or 2.5Y
Value - 5 through 7 dry, 4 through 6 moist
Chroma - 4 through 6 dry or moist
Texture - LS or LCOS
Clay content - 3 to 7 percent
Rock fragments - 0 to 25 percent cobbles, 25 to 75 percent gravel and 35 to 80 percent total
Reaction - strongly acid through slightly acid
Discontinuous lamellae are present in some pedons at lower elevations
COMPETING SERIES: This is the Balaam series. Balaam soils have secondary calcium carbonates above 40 inches, do not have an O horizon and are dry for more than 75 consecutive days following the summer solstice.
GEOGRAPHIC SETTING: Crumley soils are on mountain slopes and canyon walls at elevations of 3,200 to 6,800 feet. These soils formed in colluvium from granitic rocks and rhyolite. Slopes range from 35 to 90 percent. The average annual precipitation is 26 to 36 inches. The average annual temperature is 40 to 45 degrees F. The frost-free period is 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Charters, Eagleson and Northfork soils. Charters soils are coarse-loamy. Eagleson soils are 20 to 40 inches deep to bedrock. Northfork soils have pachic epipedons and are coarse-loamy. These soils are on similar geomorphic positions.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Crumley soils are used mainly for timber production and wildlife habitat. Native vegetation is Douglas-fir, ponderosa pine and mallow ninebark.
DISTRIBUTION AND EXTENT: West-central Idaho. MLRA 43B. Crumley soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Boise County Area, Idaho, Parts of Ada and Boise Counties, 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon - zone from 2 to 12 inches (A1 and A2 horizons)
Cambic horizon - zone from 12 to 18 inches (Bw horizon)
Particle-size control section - zone from 12 to 42 inches
Soil moisture regime xeric
All depths to diagnostic horizons and features within the range of characteristics are measured from the top of the first mineral horizon.