LOCATION RICHVILLE UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Calcixerepts
TYPICAL PEDON: Richville gravely loam, rangeland. (colors are for moist soils unless otherwise noted.)
All--0 to 4 inches; dark brown (7.5YR 3/2)) gravelly loam, dark brown (7.5YR 4/3) dry; weak fine granular structure; loose, very friable, sticky and slightly plastic; common very fine, few fine and medium roots; 20 percent pebbles in the horizon, 40 percent pebbles and 10 percent cobbles on surface; moderately calcareous, lime is disseminated; moderately alkaline (pH 8.2); clear smooth boundary. (3 to 6 inches thick)
B2--4 to 12 inches; brown (7.5YR 4/3) gravelly clay loam, light brown (7.5YR 6/4) dry; weak medium subangular blocky structure that parts to weak medium granular; slightly hard, firm, sticky and plastic; common very fine, few fine and medium roots; few fine pores; 30 percent gravel; moderately calcareous; lime is disseminated; moderately alkaline (pH 8.2); clear wavy boundary. (8 to 14 inches thick)
Clca--12 to 18 inches, brown (7.5YR 5/4) clay loam, light brown (7.5YR 6/4) dry; weak medium subangular blocky structure; hard, firm, sticky and plastic few very fine and fine roots, few fine pores 5 percent gravel; strongly calcareous, lime is segregated occurring as veining and flakes; moderately alkaline (pH 8.2); clear smooth boundary. (6 to 16 inches thick)
C2ca--12 to 28 inches, brown (7.5YR 5/4) loam, light brown (7.5YR 6/4) dry; moderate medium and coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; few very fine pores; strongly calcareous, lime is segregated, occurring as veining and flakes; moderately alkaline (pH 8.4); clear smooth boundary. (0 to 12 inches thick)
C3r--28 to 39 inches; weathered tuffaceous sandstone that readily breaks down to brown (7.5YR 4/4) loam, light brown (7.5YR 6/4) dry; very hard, extremely firm, slightly sticky and slightly plastic; few very fine and fine roots concentrated in cracks of the weathered bedrock; the weathered rock fragment interiors are noncalcareous and the exteriors are coated with secondary lime as flaked, veining and are strongly calcareous; moderately alkaline (pH 8.4); clear wavy boundary. (11 to 30 inches thick)
lI4r--39 to 60 inches; weathered conglomerate of quartzite and sandstone that breaks down to brown (7.5YR 4/4) very gravelly fine sandy loam, light brown (7.5YR 6/4) dry; massive; very hard, friable, slightly sticky and slightly plastic; few very fine roots; 65 percent gravel; strongly calcareous, lime is disseminated throughout; moderately alkaline (pH 8.2) .
TYPE LOCATION: Morgan County, Utah; about 1 1/4 niles south, 1 1/2 miles west of Morgan Courthouse; approximately 2,400 feet west and 300 feet south of the NE corner of sec. 3, T.3N., R.2E.
RANGE IN CHARACTERISTICS: The Al horizon has throughout the upper 3 to 6 inches, moist value and chroma of less than 3.5. The texture in the section from depth of 10 inches to the Cr horizon ranges from loam, silt loam, clay loam or silty clay loam and has 18 to 35 percent clay. Weathered tuffaceous sandstone occurs at depths of 28 to 40 inches. The mean annual soil temperature at a depth of 20 inches ranges from 45 to 47 degrees F. The mean summer soil temperature ranges from 67 to 68 degrees F. The soils are usually moist but are dry for 60 to 85 consecutive days during the late summer. Rock fragments consist of quartzite pebbles and range from 0 to 30 percent in the Al and B2 horizons and 0 to 20 percent in the Cca horizon.
The Al horizon has hue of 7.5YR or 10YR, value of 4 or 5 dry, 3 or 4 moist, and chroma of 2 or 3 dry and moist. It is loam or gravelly loam. This horizon is moderately to strongly alkaline. It is 3 to 6 inches thick.
The B2 horizon has hue of 10YR or 7.5YR, value of 5 or 6 dry, 3 or 4 moist and chroma of 3 or 4. It is gravelly clay loam or loam, and is moderately to strongly alkaline.
The Cca horizon has value of 6 through 8 dry, 5 or 6 moist, and chroma of 2 through 4 dry, 4 through 6 moist. It is moderately or strongly calcareous and moderately or strongly alkaline, and is 11 to 30 inches thick. The Cr horizon consists of soft weathered tuffaceous sandstone that can readily be crushed and broken at all moisture conditions.
COMPETING SERIES: These are the Causey, Hillfield, and Watkins Ridge soils. Causey and Watkins Ridge soils have mollic epipedons. Hillfield soils have a coarse-silty control section.
SETTING: Richville soils are at elevations of 5,100 to 6,000 feet. They occur on south and west facing mountain foot slopes. Slopes are 30 to 60 percent . These soils formed in residuum and alluvium weathered from tuffaceous sandstone. The climate is moist subhumid, and the average annual precipitation ranges from 18 to 22 inches. The mean annual temperature is 43 to 45 degrees F., and the frost-free period ranges from 90 to 100 days.
ASSOCIATED SOILS: These are the Hawkins, Mondey and Stoda soils. Hawkins soils have clay B2 horizons and have cracks at depth of 20 inches that extend to the surface or to the base of the Ap horizon. Mondey soils have clay mollic epipedons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff moderately slow permeability.
USE AND VEGETATION: These soils are used for watershed, range and wildlife habitat. Some small areas are cultivated. Small grains are the principal crops. The present native vegetation is blue wildrye. Indian ricegrass, antelope bitterbrush, big sagebrush, service berry, balsamroot, snakeweed and annual brome.
DISTRIBUTION AND EXTENT: Northern UTAH . This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
Series Established: Morgan County, Morgan Area, Utah, 1974.
OSED scanned by NSSQA. Last revised by state 11/74.