LOCATION DATEMAN UT+IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, active Pachic Argicryolls
TYPICAL PEDON: Dateman cobbly silt loam-coniferous forest. (Colors are for air-dry soil unless otherwise stated.) A discontinuous litter of leaves and twigs is from 0 to 2 inches thick.
A1--0 to 14 inches; brown (10YR 5/3) cobbly silt loam, very dark brown (7.5YR 2/2) moist; weak fine granular structure; soft, very friable, nonsticky and slightly plastic; many fine and common medium and few coarse roots; 20 percent cobbles; neutral (pH 7.2); gradual wavy boundary. (11 to 18 inches thick)
A2--14 to 24 inches; brown (10YR 5/3) very cobbly silt loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure parting to weak fine granular; slightly hard, very friable, slightly sticky and slightly plastic; many fine, few medium and coarse roots; 40 to 50 percent cobbles; neutral (pH 7.0); gradual irregular boundary. (6 to 12 inches thick)
Bt--24 to 34 inches; brown (7.5YR 4/4) extremely cobbly silty clay loam, dark brown (7.5YR 3/4) moist; weak medium and coarse subangular blocky structure; hard, friable, slightly sticky and plastic; few fine, medium and large roots; many very fine interstitial pores; few thin clay films in pores and on ped surfaces; 70 percent cobbles; mildly alkaline (pH 7.4); abrupt irregular boundary. (8 to 18 inches thick)
R--34 inches; fractured weathering limestone.
TYPE LOCATION: Cache County, Utah; Paradise Dry Canyon; 1,700 feet east of the west 1/4 corner, sec. 5, T. 9 N., R. 2 E.
RANGE IN CHARACTERISTICS: The average annual soil temperature is 34 to 45 degrees F, with average summer soil temperature at a 20 inch depth of 50 to 54 degrees F. The soil moisture regime is udic.
The mollic epipedon is 16 to 32 inches thick. Depth to fractured bedrock is 20 to 40 inches. The particle size control section has 35 to 80 percent rock fragments and 18 to 35 percent clay.
The A horizon has hue of 10YR or 7.5YR, value of 3 to 5 dry, 2 or 3 moist and chroma of 2 or 3. Texture is silt loam or loam with 10 to 60 percent rock fragments. Consistence is soft to slightly hard. Reaction is slightly acid to neutral.
The Bt or Bw horizon has hue of 7.5YR or 10YR, value is 4 or 5 dry, 3 or 4 moist and chroma of 3 or 4. Textures are silty clay loam or loam, with 35 to 80 percent rock fragments, mainly cobbles and gravels. Rock fragment content is 35 to 80 percent. It has weak to moderate, fine to coarse subangular blocky structure. Reaction is neutral to moderately alkaline.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Dateman soils occur on moderately sloping to very steep, north and east facing mountain slopes and mountain tops at elevations of 5,200 to 11,500 feet. Slopes are 3 to 80 percent. These soils formed in residuum and colluvium from sedimentary rocks. The climate is humid and the average annual precipitation is 22 to 35 inches. The mean annual temperature is 34 to 47 degrees F. and the average summer air temperature is 50 to 59 degrees F. The freeze-free period is 50 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Agassiz, Flygare, Onaqui, Podmor and Elwood soils. All these soils except Flygare have mean summer temperatures that are more than 59 degrees F. Agassiz and Onaqui are 10 to 20 inches deep over bedrock. Podmor is 20 to 40 inches deep over quartzite. Flygare is more than 60 inches deep and has a mean summer temperature of less than 59 degrees F.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderate permeability.
USE AND VEGETATION: Used for timber, limited grazing and for watershed. Native vegetation is Douglas-fir, alpine fir, white fir, mountain brome, snowberry and quaking aspen.
DISTRIBUTION AND EXTENT: These soils are on very steep mountain slopes in north-central Utah, southeast Idaho and western Colorado. This series is of moderate extent. MLRA 13, 28A, 28B, 48A
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Cache Area, Utah, 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone of dark colored soil material from the soil surface to a depth of 24 inches. (A1 and A2 horizons)
Argillic horizon - the zone from 24 to 34 inches. (Bt horizon)
The classification is based on the "Keys to Soil Taxonomy, Eighth Edition, 1998".