LOCATION STAMP IDEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Aquic Haplocryepts
TYPICAL PEDON: Stamp loam, rangeland - on a nearly level 1 percent southeast-facing slope. (Colors are for air-dry soil unless otherwise stated.)
A--0 to 5 inches; light brownish gray (10YR 6/2) loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine granular structure; soft, friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; moderately acid (pH 6.0); clear smooth boundary. (1 to 5 inches thick)
Bw1--5 to 11 inches; light brownish gray (10YR 6/2) loam, dark grayish brown (10YR 4/2) moist; moderate medium and fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; slightly acid (pH 6.4); clear smooth boundary. (0 to 9 inches thick)
Bw2--11 to 20 inches; grayish brown (10YR 5/2) loam, brown (10YR 4/3) moist; weak coarse subangular blocky structure parting to moderate medium and fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common medium and fine roots; neutral (pH 6.6); gradual smooth boundary. (0 to 9 inches thick)
Cg1--20 to 29 inches; light brownish gray (10YR 6/2) coarse sandy loam, grayish brown (10YR 5/2) moist; weak coarse subangular blocky structure parting to moderate medium and fine subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; common medium and fine roots; few fine prominent brownish yellow (10YR 6/8) irregularly shaped masses of iron accumulation; neutral (pH 6.8); gradual smooth boundary. (6 to 10 inches thick)
Cg2--29 to 36 inches; light gray (10YR 7/2) coarse sandy loam, grayish brown (10YR 5/2) moist; moderate coarse subangular blocky structure parting to moderate medium and fine subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; few fine and medium roots; common fine prominent brownish yellow (10YR 6/8) irregularly shaped masses of iron accumulation; neutral (pH 7.0); clear smooth boundary. (0 to 13 inches thick)
Cg3--36 to 38 inches; pale yellow (2.5Y 7/3) coarse sandy loam, grayish brown (2.5Y 5/2) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common medium prominent brownish yellow (10YR 6/8) irregularly shaped masses of iron accumulation; neutral (pH 7.0); clear smooth boundary. (0 to 26 inches thick)
2Cg4--38 to 60 inches; variegated gravelly coarse sand, loose; neutral (pH 7.2).
TYPE LOCATION: Fremont County, Idaho; about 1 mile east of Ponds Lodge; 500 feet west, 1,000 feet north of the center, sec 26, T.13N., R.43E. Latitude - 44 degrees, 25 minutes, 32 seconds north; Longitude - 111 degrees, 20 minutes, 52 seconds west.
RANGE IN CHARACTERISTICS:
Depth to water table - 12 to 36 inches
Depth to redoximorphic features - 2 to 25 inches
Average annual soil temperature - 37 to 41 degrees F.
Average summer soil temperature - 42 to 47 degrees F.
A horizon
Value - 4 to 7 dry, 2 to 4 moist
Chroma - 1 to 3 dry or moist
Reaction - moderately acid to neutral
Bw horizon
Hue - 10YR to 5Y
Value - 5 to 7 dry, 2 to 5 moist
Chroma - 2 to 4 dry or moist
Redoximorphic features: abundance, size, contrast - few or common, fine or medium, faint or distinct
Rock fragments - 0 to 20 percent
Reaction - moderately acid to slightly alkaline
Cg horizon
Color - variegated
Hue - 10YR, 2.5Y, 5Y
Value - 5 to 8 dry, 4 to 6 moist
Chroma - 2 to 4 dry or moist
Redoximorphic features: abundance, size, contrast - few or common, fine, or medium; faint to prominent
Color - 10YR 5/8, 10YR 6/8, 7.5YR 5/6, 7.5YR 5/8, 5YR 4/4, 5YR 4/6
Rock fragments - 15 to 35 percent
Reaction - moderately acid to slightly alkaline
COMPETING SERIES: These are the Gerstle and Kusdry soils. Gerstle soils have average annual soil temperatures of 21 to 28 degrees F. and are well drained. Kusdry soils have a subarctic climate.
GEOGRAPHIC SETTING: Stamp soils are on nearly level to gently sloping floodplains, stream terraces, and outwash plains. Slopes range from 0 to 4 percent. Elevation ranges from 6,000 to 7,000 feet. The soil formed in outwash and alluvium. The average annual precipitation is about 28 to 35 inches with most occurring as snowfall. The average annual air temperature is about 36 to 40 degrees F. The frost-free season is 30 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bootjack and Trude soils. Bootjack soils are fine-loamy over sandy or sandy skeletal, poorly drained and are on lower terraces and floodplains. Trude soils are sandy-skeletal, well drained and are on higher terraces and outwash plains.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderate permeability in the upper part and very rapid below.
USE AND VEGETATION: Stamp soils are used principally as rangeland and grazable woodland. The potential natural vegetation is mainly Idaho fescue, lupine, pinegrass, silver sagebrush and Lodgepole pine.
DISTRIBUTION AND EXTENT: Stamp soils are of small extent in eastern Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Fremont County, Idaho, 1989.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 5 inches (the A horizon).
Cambic horizon - the zone from 5 to 20 inches (the Bw1 and Bw2 horizons).
Particle-size control section - the zone from 10 to 40 inches. (Part of the Bw1, the Bw2, Cg1, Cg2, Cg3, and part of the 2Cg4 horizons)
The 3/2008 description reflects a change in classification from Coarse-loamy, mixed, superactive Aquic Eutrocryepts to Coarse-loamy, mixed, superactive Aquic 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.