LOCATION MCCALL IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Typic Humicryepts
TYPICAL PEDON: McCall very cobbly sandy loam, forested. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 1 inch; organic layer consisting of pine needles, twigs, leaves and grass; decomposed in the lower one-eighth inch; decomposed material slightly acid (pH 6.1).
A1--1 to 4 inches; dark grayish brown (10YR 4/2) very cobbly sandy loam, very dark brown (10YR 2/2) moist; weak very fine granular structure; soft, very friable; many very fine, fine, and medium roots; many very fine interstitial pores; moderately acid (pH 6.0); clear smooth boundary. (2 to 3 inches thick)
A2--4 to 9 inches; brown (10YR 4/3) very cobbly sandy loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure parting to weak fine granular; soft, very friable; common fine and very fine roots; slightly acid (pH 6.1); gradual smooth boundary. (4 to 7 inches thick)
Bw1--9 to 26 inches; brown (10YR 5/3) very cobbly sandy loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky; many fine and medium roots; common very fine pores; slightly acid (pH 6.3); gradual smooth boundary. (14 to 18 inches thick)
Bw2--26 to 41 inches; pale brown (10YR 6/3) very cobbly sandy loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; hard, friable, slightly sticky; many fine and medium roots; common very fine pores; slightly acid (pH 6.3); gradual smooth boundary. (12 to 18 inches thick)
Bw3--41 to 49 inches; pale brown (10YR 6/3) very cobbly coarse sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, very friable; few fine roots; slightly acid (pH 6.4); clear smooth boundary. (6 to 10 inches thick)
C--49 to 60 inches; light brownish gray (10YR 6/2) very cobbly coarse sand, grayish brown (10YR 5/2) moist; single grained; loose; slightly acid (pH 6.4).
TYPE LOCATION: Valley County, Idaho; near McCall; 2,000 feet east and 800 feet south of the NW corner of sec. 16, T.18N., R.3E.
RANGE IN CHARACTERISTICS: Rock fragments range from 35 to 80 percent throughout the profile, and range from small angular or rounded pebbles to cobblestones and large stones. The soil is slightly or moderately acid. Base saturation is 40 to 50 percent in the epipedon. Mean annual soil temperature is 41 degrees to 43 degrees F.
The A horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3. Organic matter content is 3 or 4 percent.
The Bw horizon has value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 or 4. There is a lightly increase of clay content over the A horizon, but not enough to qualify as an argillic horizon.
The C horizon is very cobbly sand or very cobbly coarse sand.
COMPETING SERIES: These are the Buell, Causewa, Hossick, Inpendence, Meredith, Mirror, Moran, and Walcott series. Buell soils are strongly or moderately acid in the control section and lack an O horizon. Causewa, Hossick, and Mirror soils have a lithic content at depths of 20 to 40 inches.soils. Inpendence soils have a base saturation of 10 to 30 percent that is highest in the surface layer and decreases with depth. Meredith soils are fragmental in the lower part of the particle-size control section. Moran soils have an umbric epipedon less than 16 inches thick and lack an O horizon. Walcott soils have a average annual soil temperature of 32 to 36 degrees F.
GEOGRAPHIC SETTING: McCall soils are on glacial moraines. Slopes are 5 to 50 percent. The soils formed from moderately coarse and coarse textured cobbly and stony glacial till. elevations are 4,900 to 5,300 feet. Average annual precipitation is 23 to 27 inches. Mean annual temperature is 39 degrees to 42 degrees F. Frost-free season is 65 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Archabal, Gestrin, and Melton soils. Archabal soils have fine-loamy control sections. Gestrin soils are moderately well drained and have medium textures throughout the sola. Melton soils are poorly drained and mottled.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; moderately rapid permeability.
USE AND VEGETATION: Used for pasture or range. Vegetation is Idaho fescue, Kentucky bluegrass, mountain brome, snowberry, pine reedgrass, and lodgepole pine.
DISTRIBUTION AND EXTENT: Moraine area in the northern part of Long Valley, Valley County, Idaho. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Valley Area, Idaho, 1977.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - from 1 to 26 inches (A and Bw1 horizons)
Cambic horizon - from 26 to 49 inches (Bw2 and Bw3 horizons)
Particle-size control section: the zone from 11 to 41 inches (part of the Bw1 and Bw2 horizons)
The 3/2008 description reflects a change in classification from Loamy-skeletal, mixed, superactive Humic Dystrocryepts to Loamy-skeletal, mixed, superactive Typic Humicryepts due to revision of the cryepts great groups and subgroups. The competing series section was not updated and should be reviewed after all the cryepts have been re-classified.