LOCATION JUGSON IDEstablished Series
TAXONOMIC CLASS: Sandy, isotic Vitrandic Haplocryepts
TYPICAL PEDON: Jugson ashy coarse sandy loam, forested. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 0.5 inches; undecomposed dry needles and leaves; moderately acid (pH 5.9).
Oe--0.5 to 1 inch; slightly decomposed needles and leaves containing some fungus growth; moderately acid (pH 5.6); fungus growth is very strongly acid (pH 4.9).
E--1 to 1.5 inches; light brownish gray (10YR 6/2) ashy coarse sandy loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; soft, very friable, slightly sticky; many fine roots; slightly acid (pH 6.2); clear wavy boundary. (discontinuous, 0 to 0.5 inches thick)
Bw1--1.5 to 8 inches; grayish brown (10YR 5/2) ashy coarse sandy loam, dark brown (10YR 3/3) moist; weak very fine crumb structure; soft, very friable, slightly sticky; many fine and medium roots; slightly acid (pH 6.1); clear smooth boundary. (4 to 12 inches thick)
Bw2--8 to 21 inches; similar to the B2ir horizon, except it has faint splotches of more grayish color; moderately acid (pH 5.7); gradual wavy boundary. (8 to 15 inches thick)
C1--21 to 36 inches; light brownish gray (10YR 6/2) loamy coarse sand, dark grayish brown (10YR 4/2) moist; weak very fine crumb structure; soft, very friable; common fine and medium roots; moderately acid (pH 6.0); clear smooth boundary. (6 to 20 inches thick)
Cr--36 to 44 inches; disintegrating biotite granite, or slightly more basic rock.
R--44 inches; granitic bedrock.
TYPE LOCATION: Valley County, Idaho; near the Melton reservoir about 3.5 miles northeast of Donnelly on Paddy Flat road; 1,000 feet north and 1,600 feet east of the SW corner of sec. 30, T.17N., R.4E.
RANGE IN CHARACTERISTICS: Depth to a paralithic contact ranges from 20 to 40 inches. Depth to hard bedrock ranges from 40 to 60 inches. The mean annual soil temperature is about 30 degrees to 40 degrees F., and the mean summer soil temperature is 40 degrees to 47 degrees F.
The O and E horizons are absent or indistinct in some pedons where the surface has been disturbed or burned.
The B2w horizon has hue of 10YR or 7.5YR, value of 4 through 6 dry, 2 or 3 moist, and chroma of 2 through 4. It is sandy loam or coarse sandy loam. Base saturation is about 35 to 45 percent and the pH ranges from about 5.0 to 6.1.
The C horizon has hue of 10YR or 2.5Y, value of 6 through 8 dry, 4 through 7 moist, and chroma of 2 through 4. The C1 horizon commonly contains splotches of stronger colors and one to several very thin, wavy, horizontal clayey bands (lamellae). Base saturation of the C horizon is 60 to 80 percent and the pH ranges from about 5.5 to 6.0.
COMPETING SERIES: This is the Scheiner series. Scheiner soils are very deep and have a xeric moisture regime.
GEOGRAPHIC SETTING: Jugson soils are on mountainous slopes, usually with a northerly aspect. Slopes are 5 to 70 percent. They formed in residuum from granite, quartz, monzonite, gneiss or similar coarse-grained acid igneous bedrock. Elevations are 3,300 to 7,000 feet. Mean annual precipitation is 25 to 45 inches. Mean annual temperature is 29 degrees to 39 degrees F. Frost-free season is 10 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Bryan soils and the Koppes, Pyle, Shellrock and Toiyabe soils. Koppes, Pyle and Shellrock soils lack A2 and Bir horizons. Toiyabe soils have a paralithic contact at a depth of 10 to 20 inches.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; medium runoff; moderate rapid permeability.
USE AND VEGETATION: Used mainly for forestry, recreation, watershed, an wildlife. Vegetation is dominantly grand fir and some Douglas-fir, western redcedar, western whitepine, western larch, and ponderosa pine. The sparse understory is mostly snowberry, western thimbleberry, mountain blueberry, Myrtle pachistima, dogwood, willow, meadowrue, beargrass, pine grass, redwood rose, falsesolomonseal, twinflower, and Oregon grape.
DISTRIBUTION AND EXTENT: Widely distributed in the colder areas of the Idaho batholith of north-central Idaho. The series is extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Valley Area, Idaho, 1977.
REMARKS:
The 3/2008 description reflects a change in classification from Sandy, isotic Vitrandic Eutrocryepts Sandy, isotic Vitrandic Haplocryepts 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.