LOCATION GRIMM UT+WYEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed, frigid Ustic
Torriorthents
TYPICAL PEDON: Grimm sandy loam, rangeland. (Colors are for air dry soil unless otherwise noted)
A11--0 to 3 inches; grayish brown (10YR 5/2) sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; few very fine tubular pores; 5 percent gravel; noncalcareous; moderately alkaline (pH 8.2); abrupt smooth boundary. (2 to 5 inches thick)
A12--3 to 8 inches; light brownish gray (10YR 6/2) sandy loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common fine and few medium roots; common very fine and few fine tubular pores; 5 percent gravel; moderately calcareous; strongly alkaline (pH 8.6); clear smooth boundary. (3 to 6 inches thick)
C1--8 to 14 inches; gray (10YR 6/2) very gravelly loamy sand, dark gray (10YR 4/1) moist; single grained; hard, very friable; common fine roots; interstitial pores; 60 percent gravel; matrix is weakly cemented; moderately calcareous; strongly alkaline (pH 8.8); clear smooth boundary. (4 to 16 inches thick)
C2--14 to 60 inches; gray (10YR 6/3) very gravelly sand, dark gray (10YR 4/1) moist; single grained; loose; few fine roots; interstitial pores; 60 percent gravel; slightly calcareous; strongly alkaline (pH 8.6).
TYPE LOCATION: Garfield County, Utah; 1 mile east of the Bear Valley Highway 89 junction; about 660 feet south and 400 feet west of the northeast corner of section 10, T.33S., R.5W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at depth of 20 inches ranges from 44 to 47 degrees F. The mean summer soil temperature ranges from 62 degrees to 65 degrees F. The soils are dry in parts of the moisture control section for 75 to 90 days during the winter, and are dry in all parts of the moisture control section 40 to 50 percent of the time when the soil temperature at depth of 20 inches is more than 41 degrees F. Rock fragments in the 10- to 40-inch control section average 40 to 60 percent but range from 35 to 70 percent.
The A1 horizon has hue of 10YR or 7.5YR, value of 5 or 6 dry, 3 or 4 moist, and chroma of 2 or 3 moist and dry. Where value is as dark as 5 dry and 3 moist, the thickness is less than 5 inches. The A1 horizon is sandy loam, very cobbly sandy loam or clay loam and has 0 to 70 percent rock fragments. It is moderately or strongly alkaline and ranges from 3 to 9 inches thick.
The C horizon has hue of 10YR or 7.5YR, value of 4 or 5 moist and chroma of 1 through 4 moist and dry. It is dominantly very gravelly loam sandy or very gravelly sand, but has some layers of sandy loam, gravelly sand, and cobbly sand. The sandy loam C horizon occurs only in some pedons, is immediately under the sandy loam or clay loam A1 horizons and is usually less than 10 inches thick. The rock fragments in the C horizon average from 40 to 60 percent, but range from 0 to 70 percent in individual layers. Only the thin layers of sandy loam in the C horizon lack rock fragments. The rock fragments larger than 3 inches range from 0 to 30 percent. The C horizon ranges from moderately to strongly alkaline.
COMPETING SERIES: These are the Adilis, Mathis, Sheeprock and Rivra series. Adilis soils are neutral, are less calcareous or noncalcareous and have a water table at depths of 1 to 3 feet. Rivra soils have a water table that fluctuates from less than 30 inches to more than 60 inches during the year, and remains within 60 inches during the late spring and early summer. Mathis soils have a mesic temperature regime. Sheeprock soils have a xeric moisture regime and a mesic temperature regime.
GEOGRAPHIC SETTING: Grimm soils are at elevations of 6,400 to 7,200 feet. They occur on all exposures, on alluvial fans, steep hills and mountain slopes. Where elevations exceed about 6,900 feet, the soils occur mainly on steep south facing slopes. Slopes are 1 to 5 percent on the fans and range from 25 to 50 percent on the hills and mountain slopes. These soils formed in alluvium and colluvium from intermediate and basic igneous rock. The climate is semi- arid, and the average annual precipitation ranges from 10 to 12 inches. The mean annual temperature is 42 degrees to 45 degrees F. The mean summer temperature is 60 degrees to 63 degrees F., and the frost-free period ranges from 80 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Glendive and Notter soils. Glendive soils are coarse-loamy, typically are sandy loam in the 10- to 40- inch control section and have less than 20 percent rock fragments. Notter soils have B2t horizons and strong lime horizons.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow to medium runoff; rapid permeability.
USE AND VEGETATION: These soils are used for rangeland, wildlife habitat, and irrigated crops of alfalfa, small grains, and pasture. The principal native vegetation is blue gramagrass, big sagebrush, yellowbrush, needle-and- thread grass, and Indian ricegrass.
DISTRIBUTION AND EXTENT: Garfield County, Utah; the series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Garfield County, (Panguitch Area), Utah, 1975.
OSED scanned by SSQA. Last revised by state on 6/76.