LOCATION HINMAN COEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Vertic Haplargids
TYPICAL PEDON: Hinman clay loam - grassland. (Colors are for dry soil unless otherwise noted.)
A--0 to 4 inches; light brownish gray (10YR 6/2) clay loam, dark grayish brown (10YR 4/2) moist; moderate fine granular structure; soft, very friable, slightly sticky, slightly plastic; calcareous; moderately alkaline (pH 8.0); clear smooth boundary. (2 to 6 inches thick)
BA--4 to 7 inches; brown (10YR 5/3) clay loam, dark brown (10YR 4/3) moist; moderate medium subangular blocky structure that parts to moderate medium granules; slightly hard, very friable, sticky, plastic; primary peds are hard; wide cracks between peds when dry; few thin glossy patches on the faces of peds and discontinuous glossy patches on some roots channels and pores; calcareous; moderately alkaline (pH 8.2); clear smooth boundary. (0 to 4 inches thick)
Bt--7 to 18 inches; brown (10YR 5/3) clay, dark brown (10YR 4/3) moist; moderate medium prismatic structure that parts to moderate medium subangular blocks; wide cracks between peds when dry; slightly hard, very friable, sticky, plastic; peds are extremely hard, many wax-like patches on the faces of peds and wax-like coatings and fillings in root channels and pores; a few wax-like rims around the entrance to some soil pores; calcareous; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 35 inches thick)
Bk1--18 to 22 inches; pale brown (10YR 6/3) clay loam, brown (10YR 5/3) moist; weak medium subangular blocky structure; wide cracks between peds when dry; slightly hard, friable, sticky, plastic; peds are extremely hard; few thin glossy patches on the faces of peds and in root channels and pores; visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; calcareous; moderately alkaline (pH 8.4); gradual wavy boundary.
Bk2--22 to 40 inches; pale brown (10YR 6/3) clay loam, brown (10YR 5/3) moist; massive; wide cracks between large irregular blocks when dry; extremely hard, very firm, sticky, plastic; visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; calcareous; moderately alkaline (pH 8.4)
TYPE LOCATION: Mesa County, Colorado; near the center of Sec. 30, T. 1 S., R. 1 E.
RANGE IN CHARACTERISTICS: MAST ranges from 51 to 55 degrees F. Depth to uniformly calcareous material normally ranges from 0 to 4 inches and is not deeper than the upper boundary of the Bt horizon. Depth to the base of the argillic horizon ranges from 12 to 40 inches. Depth to continuous subhorizons of visible secondary carbonate and/or sulfate ranges from 10 to 40 inches, but such horizons are not strong enough to qualify as calcic or gypsic horizons. Rock fragments range from 0 to 30 percent by volume in a major part of the solum and C horizon and these are mainly 1/2 to 10 inches in diameter.
The A horizon has hue of 5Y through 7.5YR, value of 5 through 7 dry, 3 through 6 moist, and chroma of 1 through 4. It is slightly or moderately alkaline.
The Bt horizon has hue of 5Y through 7.5YR, value of 5 through 7 dry, 4 through 6 moist, and chroma of 1 through 6. It is typically clay loam or clay, but ranges in clay from 35 to 50 percent. This horizon is moderately or strongly alkaline.
The C horizon has hue of 5Y through 7.5YR value of 5 through 7, and chroma of 4 through 6 moist. It is typically clay loam or clay with clay exceeding 35 percent to a depth of more than 40 inches. This horizon is moderate or strongly alkaline. Calcium carbonate equivalent of the fine earth ranges from about 3 to 14 percent.
COMPETING SERIES: This is the Penzance (AZ) series. Penzance soils have hues of 5YR and SAR values of 5 to 10.
GEOGRAPHIC SETTING: The Hinman soils are on alluvial fans, mesa tops, and valley side slopes. Slopes typically range from about 0 to 6 percent. The soil formed in thick, calcareous, moderately fine to fine textured materials derived mostly from sedimentary rocks. At the type location, the mean annual precipitation is about 7 inches with peak periods of precipitation occurring in the spring and early summer months. Mean annual temperature is 53 degrees F., mean summer temperature is 74 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mack and Mesa soils. Mack soils have fine-loamy Bt horizons and have calcic horizons. Mesa soils have fine-loamy Bt horizons and have loamy-skeletal C horizons.
DRAINAGE AND PERMEABILITY: Well drained; medium to slow runoff; slow to very slow permeability.
USE AND VEGETATION: These soils are used as grazing land or for irrigated cropland. Native vegetation is basin big sagebrush, cactus, western wheatgrass, and blue grama.
DISTRIBUTION AND EXTENT: Western Colorado. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Grand Junction Area, Colorado, 1947.
REMARKS: Last updated by the state 1/95.