LOCATION PINELLI WY+MTEstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Ustic Haplargids
TYPICAL PEDON: Pinelli loam - grassland. (Colors are for dry soil unless otherwise stated.)
A--0 to 3 inches; light brownish gray (10YR 6/2) loam, dark grayish brown (10YR 4/2) moist; strong fine granular structure; soft, very friable, slightly sticky and slightly plastic; slightly alkaline (pH 7.6); clear wavy boundary. (2 to 6 inches thick)
Bt1--3 to 6 inches; grayish brown (10YR 5/2) clay loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure parting to moderate granular; hard, very friable, moderately sticky and moderately plastic; few faint clay skins on faces of peds and discontinuous clay skins in root channels; slightly alkaline (pH 7.6); clear wavy boundary. (0 to 4 inches thick)
Bt2--6 to 16 inches; brown (10YR 5/3) clay loam, dark brown (10YR 4/3) moist; weak medium prismatic structure parting to strong fine angular and subangular blocky; very hard, very friable, moderately sticky and moderately plastic; faint continuous clay skins on faces of peds, in root channels, and as rims about the entrance to some soil pores; slightly alkaline (pH 7.6); clear wavy boundary. (5 to 35 inches thick)
Btk--16 to 21 inches; light brownish gray (10YR 6/2) clay loam, dark grayish brown (10YR 4/2) moist; moderate medium angular blocky structure parting to moderate fine angular blocky; extremely hard, friable, moderately sticky and moderately plastic; faint patchy clay skins on faces of peds and in root channels; strongly effervescent, visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; moderately alkaline (pH 8.4); diffuse wavy boundary. (3 to 18 inches thick)
Bk--21 to 60 inches; light brownish gray (2.5Y 6/2) clay loam, dark grayish brown (2.5Y 4/2) moist; massive; very hard, firm, moderately sticky and moderately plastic; strongly effervescent, visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; moderately alkaline (pH 8.4).
TYPE LOCATION: Carbon County, Wyoming; SE1/4, NW1/4 of sec. 3, T. 18 N., R. 89 W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 42 to 46 degrees F.
Mean summer soil temperature: 61 to 65 degrees F.
Depth to secondary calcium carbonate: 6 to 30 inches
Rock fragments: 0 to 15 percent mostly gravel 1/2 inch to 3 inches in diameter
A horizon:
Hue: 7.5YR to 5Y
Value: 5 through 7 dry, 3 through 6 moist
Chroma: 1 through 4 dry or moist
Reaction: neutral or slightly alkaline
Bt horizon:
Hue: 7.5YR to 5Y
Value: 5 through 7 dry, 4 through 6 moist
Chroma: 1 through 6 dry or moist
Texture: clay loam, silty clay loam, silty clay, sandy clay, or clay and has 35 to 50 percent clay, 5 to 45 percent silt, and 15 to 60 percent sand with more than 15 percent as fine or coarser sand
Reaction: neutral to moderately alkaline
Bk horizon:
Hue: 7.5YR to 5Y
Value: 6 through 8 dry, 4 through 6 moist
Chroma: 1 through 6 dry or moist
Texture: loam, sandy clay loam, or clay loam and has 18 to 40 percent clay and 15 to 35 percent fine sand or coarser
Calcium carbonate equivalent: 4 to 14 percent
Reaction: moderately alkaline or strongly alkaline
COMPETING SERIES: These are the Boettcher and Kather series.
Boettcher and Kather: have a paralithic contact at a depth of 20 to 40 inches
GEOGRAPHIC SETTING:
Parent material: alluvium and slope alluvium derived principally from sedimentary bedrock
Landform: alluvial fans, alluvial flats, playas, benches, and valley sideslopes
Slopes: 0 to 30 percent
Elevation: 5,500 to 7,800 feet
Mean annual temperature: 40 to 45 degrees F.
Mean summer temperature: about 62 degrees F.
Mean annual precipitation: 10 to 17 inches
Frost-free period: 75 to 110 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Boettcher soils and the Forelle soils. Forelle soils are fine-loamy.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderately slow or slow permeability.
USE AND VEGETATION: These soils are used as native pasture land. Native vegetation is big sagebrush, western wheatgrass, and Sandberg bluegrass.
DISTRIBUTION AND EXTENT: Central and southern Wyoming and northwestern Colorado. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Rio Blanco County, Colorado; 1979.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon--0 to 3 inches (A)
Argillic horizon--3 to 21 inches (Bt1,Bt2,Btk)
Secondary calcium carbonate--16 to 60 inches (Btk, Bk)
Classification was changed from Borollic Haplargids to frigid Ustic Haplargids 2/1999.
Taxonomic version: Eighth Edition, 1998.