LOCATION DUCHESNE UTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Typic Glossocryalfs
TYPICAL PEDON: Duchesne very cobbly sandy loam--woodland. (Colors are for moist soil unless otherwise stated.)
The surface has 3 inches of undecomposed litter of conifer twigs and needles
A--0 to 4 inches; dark brown (7.5YR 3/2) very cobbly sandy loam, brown (7.5YR 5/3) dry; weak coarse subangular blocky structure parting to moderate very fine and fine granular; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, medium and coarse roots; common fine pores; 15 percent gravel, 15 percent cobbles and 10 percent stones; strongly acid (pH 5.2); abrupt wavy boundary (2 to 5 inches thick).
E--4 to 11 inches; brown (7.5YR 4/3) gravelly fine sandy loam, very pale brown (10YR 7/3) dry; moderate thin and moderately thick platy structure; slightly hard, very friable, slightly sticky and slightly plastic; common fine and very fine and few medium and coarse roots; many very fine and fine pores; 20 percent gravel and 10 percent cobbles; strongly acid (pH 5.2); abrupt smooth boundary (5 to 15 inches thick).
E/Bt--11 to 18 inches; 70 percent E part is brown (7.5Y 5/3) gravelly fine sandy loam, pink (7.5YR 7/3) dry; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; 30 percent Bt part is brown (7.5YR 4/3) gravelly sandy clay loam, light brown (7.5YR 6/4) dry; moderate medium subangular blocky structure; very hard, firm moderately sticky and slightly plastic; few faint clay films on faces of peds. Both E and Bt have common fine and very fine and few medium roots; common very fine and fine pores; 20 percent gravel, 5 percent cobbles and 5 percent stones; strongly acid (pH 5.2); clear irregular boundary.
Bt/E--18 to 30 inches; 70 percent Bt part is strong brown (7.5YR 4/6) very cobbly sandy clay loam, light brown (7.5YR 6/4) dry; moderate medium subangular blocky structure; very hard, firm, moderately sticky and slightly plastic; few faint clay films on faces of peds. 30 percent E part is brown (7.5YR 5/3) very cobbly fine sandy loam, pink (7.5YR 7/3) dry; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic. Both Bt and E have few very fine and fine roots; common very fine pores; 15 percent gravel and 20 percent cobbles; strongly acid (pH 5.4); clear wavy boundary.
Bt1--30 to 42 inches; strong brown (7.5YR 4/6) very cobbly sandy clay loam, strong brown (7.5YR 5/6) dry; parts of most ped surfaces are coated with brown (7.5YR 5/3) sand and silt; weak coarse subangular blocky structure; extremely hard, very firm, moderately sticky and moderately plastic; few very fine and fine roots; many very fine pores; few faint clay films on faces of peds; 20 percent gravel and 30 percent cobbles; strongly acid (pH 5.4); abrupt wavy boundary (10 to 20 inches thick).
Bt2--42 to 60 inches; yellowish red (5YR 4/6) very cobbly sandy clay loam, strong brown (7.5YR 5/6) dry; weak coarse subangular blocky structure; extremely hard, very firm, moderately sticky and moderately plastic; few fine and very fine roots; common very fine pores; few faint clay films on faces of peds; 20 percent gravel, 25 percent cobbles and 10 percent stones; strongly acid (pH 5.4).
TYPE LOCATION: Summit County, Utah; 2/3 mile southwest of Fish Lake; about 650 feet west and 1,900 feet south of the northeast corner of Sec. 2, T. 2 N; R. 11 E.; Elizabeth Mountain, Utah-Wyoming USGS quad; lat. 40 degrees 56 minutes 24 seconds N. and long. 110 degrees 39 minutes 30 seconds W., NAD 1927
RANGE IN CHARACTERISTICS:
Soil moisture regime: Udic
Mean annual soil temperature: 37 to 42 degrees F.
Mean summer soil temperature: 50 to 58 degrees F.
Depth to lithic contact: Greater than 60 inches
Depth to the argillic horizon: less than 24 inches.
Particle-size control section: 25 to 35 percent clay and 35 to 60 percent rock fragments.
A horizon:
Hue: 7.5YR or 10YR
Value: 3 or 4 moist, 5 or 6 dry
Chroma: 2 or 3 moist and dry
Rock fragments: 35 to 70 percent
Reaction: Slightly acid to strongly acid
E horizon:
Hue: 10YR, 7.5YR, 5YR
Value: 5 or 6 moist, 7 to 8 dry
Chroma: 2 or 3 moist and dry
Texture: grfsl, grv-sl, cbv-sl
Rock fragments: 25 to 50 percent
Reaction: Slightly acid to strongly acid
Bt horizon:
Hue: 10YR, 7.5YR, 5YR
Value: 3 to 5 moist, 4 to 6 dry
Chroma: 4 to 6 moist and dry
Texture: grv-l, grv-scl, cbv-scl
Rock fragments: 35 to 60 percent
Reaction: Slightly acid to strongly acid
COMPETING SERIES:
Augustura (NM): mean summer soil temperature is 42 to 46 degrees F. and the central concept is of a soil lacking A horizons.
GEOGRAPHIC SETTING: These soils are on rolling to hilly ground moraines, dissected lateral moraines and glaciated mountain slopes at elevations of 8,100 to 10,800 feet. Slopes range from 2 to 60 percent. These soils formed in till derived mainly from a mixture of quartzite, sandstone and shale. Mean annual temperature is 35 to 40 F, mean summer temperature is 50 to 58 degrees F, and the freeze-free period is 20 to 60 days. Average annual precipitation ranges from 22 to 35 inches and falls mostly as snow in late autumn, winter and early spring.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Marsell, Mirror Lake, and Uintah soils. Marsell and Mirror Lake soils lack argillic horizons and Mirror Lake soils have sandy-skeletal particle-size control sections. Uinta soils have fine-loamy particle size control sections.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Used mainly for watershed, wildlife habitat, recreation, and timber production. Vegetation is mainly subalpine fir, Englemann spruce, and lodgepole pine with an understory of low huckleberry, and sedge.
DISTRIBUTION AND EXTENT: Northcentral Utah and western Colorado. These soils are moderately extensive. MLRA 47, 48A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Wasatch County, Utah, 1974.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface of the mineral soil to 4 inches (A horizon)
Glossic horizon - from 11 to 30 inches (E/Bt and Bt/E horizons)
Argillic horizon - the zone from 18 to 60 inches (Bt/E, Bt1, and Bt2 horizons).
Base saturation is estimated to be greater than 35 percent (by sum of cations) at a depth of 67 inches, hence not in the Ultisols class.
Keys to Taxonomy: Eighth Edition, 1998
ADDITIONAL DATA: