LOCATION RUDEEN IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Aridic Calcixerolls
TYPIFYING PEDON: Rudeen extremely stony loam, range. (Colors are for dry soil unless otherwise noted.)
A11--0 to 4 inches; grayish brown (10YR 5/2) extremely stony loam, very dark grayish brown (10YR 3/2) moist; weak medium platy structure that parts to weak very fine granular structure; soft, very friable, slightly sticky, slightly plastic;; many very fine and fine roots; many very fine interstitial pores; about 25 percent white (N 8/) angular volcanic tuff fragments ranging in size from gravel to stones; moderately alkaline (pH 8.0); clear smooth boundary. (2 to 6 inches thick)
A12--4 to 10 inches; grayish brown (10YR 5/2) extremely stony loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure that parts to weak very fine granular; soft, very friable, slightly sticky, slightly plastic; many very fine and fine roots; many very fine tubular pores; about 25 percent volcanic tuff fragments ranging in size from gravel to stones; slightly calcareous, rock fragments slightly coated with lime on lower side; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 8 inches thick)
C1ca--10 to 16 inches; light gray (10YR 7/2) channery loam, brown (10YR 5/3) moist; weak medium prismatic structure that parts to weak fine and very fine subangular blocky; slightly hard, friable, slightly sticky, slightly plastic; common very fine and fine roots; many very fine tubular pores; about 35 percent white (N 8/) volcanic tuff fragments ranging from angular gravel to stones; strongly calcareous, few lime spots, rock fragments lime coated on all sides; moderately alkaline (pH 8.2); clear wavy boundary. (5 to 8 inches thick)
C2ca--16 to 28 inches; light gray (10YR 7/2) very channery loam, brown (10YR 5/3) moist; massive; soft, very friable, slightly sticky, slightly plastic; common very fine and fine roots; many very fine tubular pores; about 60 percent tuff fragments ranging in size from angular gravel to stones and coated with lime; strongly calcareous; very strongly alkaline (pH 9.2); gradual wavy boundary. (4 to 20 inches thick)
C3--28 to 38 inches; very pale brown (10YR 7/2) very channery loam, brown (10YR 5/3) moist; massive; soft, very friable, nonsticky, slightly plastic; many very fine tubular pores; about 60 percent white (N 8/) volcanic tuff coarse fragments ranging from angular gravel to stones; rock fragments mostly not lime coated; strongly calcareous; very strongly to stones; rock fragments mostly not lime coated; strongly calcareous; very strongly alkaline (pH 9.3); abrupt irregular boundary. (0 to 11 inches thick)
R--38 to 60 inches; white (N 8/) volcanic tuff; platy (1/2 inch thick plates); indurated.
TYPE LOCATION: Power County, Idaho; SW1/4 NE1/4 sec. 9, T.8S., R.32E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 42 degrees to 47 degrees F. and the mean summer soil temperature at a depth of 20 inches ranges from 59 degrees to 66 degrees f. The soils are usually dry but are continuously moist in all parts between depths of 4 and 12 inches for 60 to 80 days in late winter and spring. Indurated volcanic tuff or rhyolite bedrock is at depths ranging from 20 to 40 inches. The control section between a depth of 10 inches and the bedrock is dominantly medium textured and contains more than 35 percent rock fragments, mainly volcanic tuff or rhyolite. The rock fragments range from angular gravel to channery fragments, angular cobbles, flagstones or stones. The mollic epipedon and the solum range from 7 to 14 inches thick. The A horizon has value of 4 or 5 dry, and 2 or 3 moist. It ranges from weak platy in the upper few inches to weak subangular blocky in the lower part and parts to weak granular structure. Where mixed to 7 inches the A1 horizon is slightly or moderately calcareous but the upper few inches of some undisturbed pedons are noncalcareous. The calcic horizon is immediately below the mollic epipedon and contains 15 to 40 percent lime. The calcic horizon has value of 6 or 7 dry, 4 or 5 moist, and chroma of 2 or 3. The upper part of the Cca horizon has weak prismatic or weak or moderate subangular blocky structure.
COMPETING SERIES AND THEIR DIFFERENTIAE: These are the Broad, Denay, Drage, Hondoho, Pandoah, Swanner, Tickason, and Wahtigup series. Broad and Drage soils have argillic horizons. Denay and Hondoho soils lack bedrock above a depth of 40 inches. Pandoah soils lack calcic horizons. Swanner soils lack calcic horizons and have bedrock at depths of less than 20 inches. Tickason and Wahtigup soils have less than 35 percent rock fragments and have no bedrock at depths of less than 40 inches.
SETTING: Rudeen soils are on undulating to very steep uplands and mountains. Slopes range up to 65 percent and are mostly southerly. Elevations range from 4,900 to 6,500 feet. The soils formed dominantly in residuum from volcanic tuff and rhyolite but the upper part may be influenced by loess. The semiarid climate has a mean annual precipitation of 11 to 13 inches including 2 to 4 feet of snowfall and a mean freeze-free period of 80 to 110 days.
PRINCIPAL ASSOCIATED SOILS: These are the competing Wahtigup and Hondoho soils and the Neeley soils. Neeley soils have silt loam texture and lack coarse fragments.
DRAINAGE AND PERMEABILITY: Well or somewhat excessively drained; medium or rapid runoff; moderate permeability.
USE AND VEGETATION: Used primarily for range but small areas are cropped to small grains. The natural vegetation is mainly bluebunch wheatgrass, Sandberg bluegrass, cheatgrass, sagebrush, and in places juniper, snowberry, rabbitbrush, western wheatgrass or bitterbrush.
DISTRIBUTION AND EXTENT: Southeastern Idaho. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Power County, Idaho, 1973.
REMARKS: Formerly classified as Calcisols.