LOCATION SLIPMAN WYEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Alfic Argicryolls
TYPICAL PEDON: Slipman sandy loam - grassland parks in open ponderosa stands. (Colors are for dry soil unless otherwise noted.)
A--0 to 11 inches; grayish brown (10YR 5/2) sandy loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable; slightly acid (pH 6.2); gradual smooth boundary. (6 to 15 inches thick)
E1--11 to 15 inches; brown (10YR 5/3) light sandy loam, brown (10YR 4/3) moist; weak coarse subangular blocky structure that parts to moderate fine granules; slightly hard, very friable; moderately acid (pH 6.0); clear smooth boundary. (0 to 8 inches thick)
E2--15 to 22 inches; pale brown (10YR 6/3) loamy sand, brown (10YR 5/3) moist; weak thin platy structure that parts to weak fine and medium subangular blocks and then to granules; slightly hard, very friable; vesicular; slightly acid (pH 6.2); gradual wavy boundary. (4 to 10 inches thick)
E/B--22 to 27 inches; mixed colors including pale brown (10YR 6/3) and brown (7.5YR 5/4) sandy loam; brown (10YR 5/3) moist and brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; hard, very friable; this horizon consists of nodules and seams of clayey material like that of the underlying horizon imbedded in a coarser textured and lighter colored matrix like that of the overlying horizon; few faint clay films on faces of the more clayey peds; neutral (pH 6.8); gradual wavy boundary. (4 to 8 inches thick)
Bt--27 to 50 inches; brown (7.5YR 5/4) stony sandy clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; very hard; very friable; faint continuous clay films on faces of peds and in root channels; 20 percent stones; neutral (pH 6.8); gradual wavy boundary. (10 to 24 inches thick)
R--50 inches; hard sandstone bedrock.
TYPE LOCATION: Johnson County, Wyoming; SW1/4 SW1/4 sec. 25, T.45N., R.84W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 32 to 46 degrees F. The mean summer soil temperature is 40 to 58 degrees F. The mollic epipedon is 7 to 15 inches thick. The solum is 30 to 60 inches thick. Depth to hard bedrock is 40 to 60 inches. Coarse sandstone fragments are 0 to 35 percent. These increase with increasing depth and exceed 15 percent in the lower part.
The A horizon has hue of 2.5Y or 10YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 1 through 3 dry and moist. It has crumb, granular or subangular blocky structure. This horizon is slightly acid or neutral.
The E horizon has hue of 2.5Y through 7.5YR, value of 6 or 7 dry, 5 or 6 moist and chroma of 2 through 4 dry and moist. It usually has platy structure but some pedons have granular or subangular blocky structure. This horizon is moderately acid through neutral.
The Bt horizon has hue of 2.5Y through 7.5YR, value of 5 or 6 dry, 4 or 5 moist, and chroma of 3 through 5 dry and moist. It is typically sandy clay loam but some pedons are sandy loam or loam. Clay averages 18 to 35 percent, silt 5 to 30 percent and sand 45 to 70 percent, with more than 35 percent fine sand or coarser. This horizon is neutral or slightly alkaline.
COMPETING SERIES: These are the Anvik, Bear Basin, Celaya (T), Klutter (T), Mayland (T), McIntyre(T), Monad, Paintrock and Quietus series. Anvik and Celaya soils have argillic horizons with less than 35 percent fine or coarser sand. Bear Basin and Monad soils have no bedrock above depth of 60 inches and have more than 40 percent rock fragments of rounded pebbles, cobbles and stones in the C horizon. Klutter soils have a paralithic contact at depths of 20 to 40 inches. Mayland soils have medium or strongly acid B2t horizons. McIntyre soils have a lithic contact at depths of 20 to 40 inches and are very strongly or strongly acid in the A and B horizon. Paintrock soils have continuous horizons of secondary calcium carbonate accumulation. Quietus soils lack transitional AB horizons, have less than 35 percent fine or coarser sand, and formed in materials from limestone and dolomites.
GEOGRAPHIC SETTING: Slipman soils are on moderately sloping upland hills and ridges. Slopes are 0 to 30 percent. These soils formed in residuum weathered from sandstone. The average annual precipitation is 20 inches with peak periods of precipitation during the spring and early summer. Mean annual temperature is 34 degrees F., and mean summer temperature is 53 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Passcreek and Sublette soils. Passcreek soils have a lithic contact at depths of 20 to 40 inches. Sublette soils have mollic epipedons 16 to 30 inches thick.
DRAINAGE AND PERMEABILITY: Well-drained; medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used principally as native pastureland, for recreation, and for limited forestry purposes. Principal native vegetation is Idaho fescue, green needlegrass, and scattered ponderosa pine.
DISTRIBUTION AND EXTENT: Bighorn Mountain areas of north-central Wyoming. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Johnson County (Southern Johnson County Area), Wyoming, 1971.