LOCATION MONDEY UTEstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Vertic Argixerolls
TYPICAL PEDON: Clay loam, non-irrigated cropland. (Colors are for moist soil unless otherwise noted.)
Ap--O to 4 inches, very dark brown (10YR 2/2) clay loam, dark grayish brown (10YR 4/2) dry, weak fine granular structure; soft, firm, sticky and plastic; few very fine and fine roots; common very fine pores; slightly acid (pH 6.2); clear smooth boundary. (3 to 5 inches thick)
A12--4 to 9 inches, very dark brown (10YR 2/2) clay loam, dark grayish brown (10YR 4/2) dry; weak medium subangular blocky structure; very hard, firm, sticky and plastic; few fine and common very fine roots few very fine and fine pores; slightly acid (pH 6.2); gradual wavy boundary. (4 to 6 inches thick)
Blt--9 to 14 inches, dark brown (7.5YR 3/2) clay, dark brown (7.5YR 4/2) dry; weak medium subangular blocky structure; extremely hard, very firm, very sticky and very plastic; few very fine and fine roots; few very fine and fine pores; slightly acid (pH 6.2); gradual wavy boundary. (4 to 6 inches thick)
B21t--14 to 23 inches, reddish brown (5YR 4/3) clay, brown (7.5YR 5/4) dry; moderate medium and coarse subangular blocky structure; extremely hard, very firm, very sticky and very plastic; few very fine and fine roots; common very fine and fine pores; common thin clay films on faces of peds and in pores; slightly acid (pH 6.2); clear smooth boundary. (8 to 10 inches thick)
B22t--23 to 31 inches, reddish brown (5YR 4/3) clay, brown (7.5YR 5/4) dry; moderate medium and coarse subangular blocky structure; extremely hard, very firm, sticky and very plastic; few very fine and fine, few medium roots; common very fine and fine pores; common thin clay films on faces of peds and in pores slightly acid (pH 6.2); clear smooth boundary. (7 to 9 inches thick)
B3ca--31 to 36 inches, dark brown (7.5YR 4/4) clay loam, brown (7.5YR 5/4) dry; weak medium subangular blocky structure; extremely hard, firm, sticky and plastic; few very fine and fine roots; common very fine and fine pores; common thin clay films on faces of peds and in pores; moderately calcareous, lime is veined; neutral (pH 6.8); clear smooth boundary. (0 to 6 inches thick)
Cca--36 to 60 inches, brown (7.5YR 5/4) loam, very pale brown (10YR 7/3) dry; weak medium subangular blocky structure; hard, friable, slightly sticky and plastic; few very fine and fine roots; many very fine and fine pores; strongly calcareous, lime is blocky and in veins; neutral (pH 7.2).
TYPE LOCATION: Morgan County, Utah; about 1 1/2 miles west and 2 miles south of Morgan Courthouse; approximately 1,320 feet west and 500 feet north of E1/4 corner sec. 10, T.3N., R.2E.
RANGE IN CHARACTERISTICS: The mollic epipedon ranges from 8 to 19 inches thick. The combined thickness of the Al and B2t horizons ranges from 22 to 44 inches. Depth to the top of the Cca horizon ranges from 22 to 44 inches. The mean annual soil temperature at depth of 20 inches ranges from 46 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 summer. Cracks 1 to 5 cm. wide at a depth of 50 cm. are more than 30 cm. long and extend upward to the surface to the base of an Ap horizon and open and close annually. Gilgai micro-relief is evident in undisturbed areas.
The A horizon has hue of 10YR or 7.5YR, value of 3 or 4 dry and chroma of 2 or 3 dry. It ranges from clay loam to silty clay loam. This horizon is slightly acid or neutral and is 8 to 10 inches thick.
The B2t horizon has hue of 7.5YR or 5YR, value of 4 or 5 dry, 3 or 4 moist and chroma of 2 through 4 dry and moist. It is silty clay or clay and has weak or moderate medium subangular blocky structure. This horizon has few to common, thin to moderately thick clay films on peds and in pores. It is noncalcareous and slightly acid or neutral, and ranges from 10 to 25 inches thick.
The Cca horizon has hue of 10YR or 7.5YR, value of 6 through 8 dry, 4 through 7 moist, and chroma of 2 and 3 dry, 2 through 4 moist. It is loam, silt loam or clay loam. This horizon is strongly calcareous and neutral to moderately alkaline.
COMPETING SERIES: These are the Forsgren, Manila, Montour and Ukiah series. Forsgren, Montour and Ukiah soils have a mesic temperature regime. Manila soils do not crack to the surface.
GEOGRAPHIC SETTING: Mondey soils are at elevations of 5,100 to 5,800 feet. They occur dominantly on north and east facing rolling hills, mountain foot slopes and mountain slopes. Slopes are 8 to 30 percent. These soils formed in residuum weathered from 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. The mean summer temperature is 63 to 65 degrees F. and the frost-free period ranges from 90 to 100 days.
PRINCIPAL ASSOCIATED SOILS: These are the Hawkins, Richville and Stoda soils. Hawkins soils lack argillic horizons. Richville soils have ochric epipedons, lack argillic horizons and are 28 to 40 inches deep over tuffaceous sandstone. Stoda soils have mean annual temperatures of more than 47 degrees F. and lack argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; rapid runoff; slow permeability.
USE AND VEGETATION: These soils are used primarily for nonirrigated cropland. Small areas are used for irrigated cropland or range. Alfalfa, barley and wheat are the principal crops. The present native vegetation is bluebunch wheatgrass, blue wildrye, antelope bitterbrush, big sagebrush, serviceberry, arrowleaf balsamroot and annual brome.
DISTRIBUTION AND EXTENT: These soils occur in 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.