LOCATION DUTCHDAN WY
Tentative Series
Rev. TAG-DMM-RJS
05/2011
DUTCHDAN SERIES
The Dutchdan series consists of very deep, somewhat poorly drained soils that formed in slope alluvium derived from metamorphic and sedimentary rock. These soils are on mountain ridges. Slopes are 2 to 15 percent. Mean annual precipitation is about 560 mm, and mean annual air temperature is about 1 degree C.
TAXONOMIC CLASS: Clayey-skeletal, smectitic Aquic Haplocryalfs
TYPICAL PEDON: Dutchdan gravelly clay loam, in forest land (colors are for dry soil unless otherwise noted).
Oi--0 to 7 cm; slightly decomposed plant material; strongly acid (pH 5.5); abrupt smooth boundary. (3 to 8 centimeters thick)
A--7 to 29 cm; dark brown (7.5YR 3/2) gravelly clay loam, very dark brown (7.5YR 2.5/2) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; many fine interstitial pores; 20 percent gravel and 5 percent cobbles; moderately acid (pH 5.8); gradual wavy boundary. (15 to 24 centimeters thick)
Bt1--29 to 63 cm; light yellowish brown (10YR 6/4) very cobbly clay loam, yellowish brown (10YR 5/4) moist; moderate medium and coarse subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; many fine roots; many fine interstitial pores; 20 percent continuous distinct clay films on all faces of peds; 20 percent gravel and 30 percent cobbles; slightly acid (pH 6.3); gradual wavy boundary. (25 to 45 centimeters thick)
Bt2--63 to 103 cm; light gray (10YR 7/2) gravelly clay, light gray (10YR 7/1) moist; weak medium and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine roots; common fine tubular pores; 20 percent continuous distinct clay films on all faces of peds; 2 percent prominent strong brown (7.5YR 4/6) masses of oxidized iron in matrix; 15 percent gravel; neutral (pH 6.9); clear wavy boundary. (30 to 60 centimeters thick)
BCk--103 to 200 cm; light gray (5Y 7/2) gravelly clay, light gray (5Y 7/2) moist; massive; very hard, very firm, very sticky and very plastic; few very fine roots; common fine tubular pores; 2 percent prominent strong brown (7.5YR 4/6) masses of oxidized iron in matrix; 10 percent calcium carbonate masses; 15 percent gravel; strongly effervescent; moderately alkaline (pH 7.9).
TYPE LOCATION: Sublette County, Wyoming; located approximately 50 feet south and 945 feet east of the northwest corner of the section of section 6, T. 30N, R. 114W; USGS Springman Creek, Wyoming topographic quadrangle; 42 degrees 37 minutes 37.00 seconds north latitude and 110 degrees 28 minutes 15.00 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil temperature - 1.5 to 3.5 degrees C.
Depth to argillic horizon - 25 to 40 cm
Depth to calcic horizon - 100 to 150 cm
Depth to reduced matrix - 45 to 75 cm
Particle-size control section weighted average) - greater than 35 percent rock fragments
A horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 3 or 4 dry; 2.5 or 3 moist
Chroma: 2 or 3; dry or moist
Clay content: 27 to 35 percent
Rock fragments: 20 to 30 percent--20 to 30 percent gravel, 0 to 10 percent cobbles
Reaction: pH 5.6 to 6.0
Bt1 horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 3 or 4; dry or moist
Texture: clay loam, clay
Clay content: 35 to 50 percent
Rock fragments: 40 to 55 percent--15 to 25 percent gravel; 20 to 30 percent cobbles
Reaction: pH 6.1 to 6.5
Bt2 horizon
Hue: 2.5Y or 10YR; dry or moist
Value: 6 or 7; dry or moist
Chroma: 1 or 2; dry or moist
Texture: clay, clay loam
Clay content: 38 to 55 percent
Rock fragments: 10 to 25 percent--10 to 20 percent gravel, 0 to 10 percent cobbles
Reaction: pH 6.6 to 7.3
BCk horizon
Hue: 2.5Y or 5Y; dry or moist
Value: 6 or 7; dry or moist
Chroma: 1 or 2; dry or moist
Texture: clay, clay loam
Clay content: 35 to 50 percent
Rock fragments: 10 to 25 percent--10 to 20 percent gravel, 0 to 10 percent cobbles
Calcium carbonate equivalent: 15 to 25 percent
Reaction: pH 7.9 to 8.4
COMPETING SERIES:
Jefflake (WY) - do not have secondary calcium carbonate accumulation
GEOGRAPHIC SETTING:
Landform - mountain ridges
Elevation - 2560 to 2745 meters
Slope - 2 to 15 percent
Parent Material - slope alluvium derived from metamorphic and sedimentary rock
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 500 to 610 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature - 0.5 to 2.0 degrees C.
Frost-free period - 15 to 40 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; very slow permeability. Seasonal high water table fluctuates between a depth of 45 and 75 centimeters at some time between the months of May and July and is saturated long enough to develop redox depletions.
USE AND VEGETATION: Dutchdan soils are primarily used for forest land. The potential native vegetation is mainly Douglas-fir, aspen, elk sedge, and pine grass.
DISTRIBUTION AND EXTENT: Dutchdan soils are of small extent in southwestern Wyoming. MLRA - 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES PROPOSED: Sublette County, Wyoming, 2011. The series name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 29 cm (Oi, A horizon)
Argillic horizon - 29 to 103 cm (Bt1, Bt2 horizons)
Calcic horizon - 103 to 200 cm (BCk horizons)
Reduced matrix - 63 to 200 cm (Bt2, BCk horizons)
Particle-size control section - from 29 to 79 cm (Bt1, part of Bt2 horizons).
Dutchdan soils have a cryic temperature regime, an udic moisture regime and an aquic moisture subclass.
National Cooperative Soil Survey
U.S.A.