LOCATION SLEDRUNNER WY
Tentative Series
Rev. TAG-DMM-RJS
05/2011
SLEDRUNNER SERIES
The Sledrunner series consists of very deep, well drained soils that formed in slope alluvium or colluvium derived from metamorphic and sedimentary rock. These soils are on escarpments, hills, landslides and eroded fan remnants. Slopes are 4 to 30 percent. Mean annual precipitation is about 430 mm, and mean annual air temperature is about 1 degrees C.
TAXONOMIC CLASS: Fine, smectitic Vertic Haplocryalfs
TYPICAL PEDON: Sledrunner silty clay loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 6 cm; olive brown (2.5Y 4/3) silty clay loam, dark olive brown (2.5Y 3/3) moist; weak fine granular structure; hard, firm, slightly sticky and slightly plastic; many fine and common medium roots; many fine interstitial pores; slightly effervescent; moderately alkaline (pH 7.9); clear smooth boundary. (5 to 15 cm thick)
Btk1--6 to 58 cm; light olive brown (2.5Y 5/4) silty clay, olive brown (2.5Y 4/4) moist; strong medium and coarse prismatic structure; very hard, very firm, moderately sticky and moderately plastic; many fine and common medium roots; common fine tubular pores; 75 percent distinct clay films on all faces of peds; finely disseminated calcium carbonate; strongly effervescent; strongly alkaline (pH 8.5); clear wavy boundary.
Btk2--58 to 105 cm; light olive brown (2.5Y 5/4) silty clay, olive brown (2.5Y 4/4) moist; strong medium and coarse prismatic structure; extremely hard, extremely firm, very sticky and very plastic; common fine roots; common fine tubular pores; 75 percent distinct clay films on all faces of peds; finely disseminated calcium carbonate; strongly effervescent; strongly alkaline (pH 8.6); clear smooth boundary. (combined thickness of the Btk1, Btk2 horizons - 60 to 135 cm)
BCk1--105 to 135 cm; light yellowish brown (2.5Y 6/3) silty clay loam, light olive brown (2.5Y 5/3) moist; massive; hard, firm, slightly sticky and slightly plastic; common fine and medium roots; common fine tubular pores; 10 percent carbonate masses in matrix; violently effervescent; moderately alkaline (pH 8.4); gradual wavy boundary.
BCk2--135 to 200 cm; light yellowish brown (2.5Y 6/3) silty clay loam, light olive brown (2.5Y 5/3) moist; massive; hard, firm, slightly sticky and slightly plastic; common fine and medium roots; common fine tubular pores; 5 percent carbonate masses in matrix; violently effervescent; moderately alkaline (pH 8.3). (combined thickness of the BCk1, BCk2 horizons - greater than 80 cm)
TYPE LOCATION: Sublette County, Wyoming; located approximately 1,870 feet south and 1,670 feet west of the northeast corner of section 14, T. 36N, R. 113W; USGS Kismet Peak, Wyoming topographic quadrangle; 43 degrees 5 minutes 32.00 seconds north latitude and 110 degrees 17 minutes 57.00 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil temperature - 1.5 to 3.5 degrees C.
Depth to argillic horizon - 5 to 15 cm
Depth to secondary calcium carbonate accumulation - 5 to 30 cm
Note: Some pedons may have a Bt horizon above the Btk horizons.
A horizon
Hue: 10YR or 2.5Y; dry or moist
Value: 3 or 4; dry
Texture: clay loam, silty clay loam
Clay content: 30 to 40 percent
Rock fragments: 0 to 15 percent--0 to 10 percent gravel, 0 to 2 percent cobbles
Calcium carbonate equivalent: 0 to 5 percent
Reaction: pH 7.4 to 8.0
Bt horizon (where present)
Hue: 10YR or 2.5Y; dry or moist
Value: 4 or 5; dry or moist
Chroma: 3 or 4; dry or moist
Texture: clay, silty clay loam, silty clay, clay loam
Clay content: 35 to 55 percent
Rock fragments: 0 to 10 percent--0 to 10 percent gravel, 0 to 2 percent cobbles
Reaction: pH 7.4 to 7.8
Btk1, Btk2 horizons
Hue: 10YR or 2.5Y; dry or moist
Value: 4 or 5; dry or moist
Chroma: 3 or 4; dry or moist
Texture: clay, silty clay loam, silty clay, clay loam
Clay content: 35 to 55 percent
Rock fragments: 0 to 10 percent--0 to 10 percent gravel, 0 to 2 percent cobbles
Calcium carbonate equivalent: 3 to 10 percent
Sodium adsorption ratio: 0 to 10
Reaction: pH 7.9 to 8.6
BCk1, BCk2 horizons
Hue: 2.5Y or 5Y; dry or moist
Value: 5 or 6; dry or moist
Chroma: 3 or 4; dry or moist
Texture: clay, clay loam, silty clay, silty clay loam
Clay content: 30 to 45 percent
Rock fragments: 0 to 15 percent gravel
Para fragments: 0 to 25 percent paragravel
Calcium carbonate equivalent: 3 to 15 percent
Sodium adsorption ratio: 0 to 10
Reaction: pH 7.9 to 8.6
COMPETING SERIES:
Bridgerton (WY) - have an udic soil moisture regime
Doolittle (MT) - are moderately deep to a paralithic contact
Goldhill (ID) - have a xeric soil moisture regime
Harkness (ID) - have an udic soil moisture regime
Herd (UT) - do not have secondary calcium carbonate accumulation
Riflepit (SD) - are deep to a paralithic contact
GEOGRAPHIC SETTING:
Landform - escarpments, hills, landslides, eroded fan remnants
Elevation - 2200 to 2500 meters
Slope - 4 to 30 percent
Parent Material - slope alluvium or colluvium derived from metamorphic and sedimentary rock
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 380 to 485 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature - 0.5 to 1.5 degrees C.
Frost-free period - 25 to 45 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; very slow permeability.
USE AND VEGETATION: Sledrunner soils are primarily used for rangeland. The potential native vegetation is mainly low sagebrush, mountain brome, yellow rabbitbrush, slender wheatgrass, basin wildrye, spike fescue and western wheatgrass.
DISTRIBUTION AND EXTENT: Sledrunner 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 - from 0 to 6 cm (A horizon)
Argillic horizon - from 6 to 105 cm (Btk1, Btk2 horizons)
Secondary calcium carbonate horizons - from 6 to 200 cm (Btk1, Btk2, BCk1, BCk2 horizons)
Particle size control section - from 6 to 56 (part of Btk1 horizon)
Sledrunner soils have a cryic temperature regime and an ustic moisture regime.
National Cooperative Soil Survey
U.S.A.