LOCATION UDELOPE NVEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive Lithic Haplocryolls
TYPICAL PEDON: Udelope bouldery sandy loam, rangeland. (Colors are for dry soil unless otherwise noted.) The surface is partially covered with 1 percent boulders and stones and 5 percent cobbles.
Oi--0 to 2 inches; partially decomposed leaf litter.
A1--2 to 4 inches; dark grayish brown (10YR 4/2) bouldery sandy loam, black (10YR 2/1) moist; weak medium subangular blocky structure parting to medium very fine and fine granular; soft, very friable, nonsticky and nonplastic; many very fine roots; many very fine interstitial pores; 1 percent boulders and stones, 5 percent cobbles; medium acid (pH 6.0); abrupt smooth boundary. (1 to 3 inches thick)
A2--4 to 9 inches; dark grayish brown (10YR 4/2) sandy loam, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine, fine, medium and few coarse roots; common very fine and fine tubular pores; slightly acid (pH 6.2); clear smooth boundary. (2 to 5 inches thick)
A3--9 to 12 inches; dark grayish brown (10YR 4/2) sandy loam, very dark brown (10YR 3/3) moist; moderate medium and fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine, fine, medium and coarse roots; common very fine and fine tubular pores; few thin clay films lining pores; 3 percent pebbles; slightly acid (pH 6.2); clear smooth boundary. (3 to 14 inches)
Bw--12 to 18 inches; grayish brown (10YR 5/2) gravelly sandy loam, dark brown (10YR 3/3) moist; moderate medium and coarse subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few very fine and fine roots; many very fine, fine and few medium tubular and few very fine interstitial pores; 15 percent pebbles, 5 percent cobbles; neutral (pH 6.6); abrupt smooth boundary. (0 to 10 inches thick)
R--18 inches; hard volcanic rock that is highly fractured in the upper 2 inches.
TYPE LOCATION: Humboldt County, Nevada; near Cabin Creek in the Santa Rosa Mountains approximately 100 feet east and 400 feet south of the northwest corner of section 1, T. 44 N., R. 39 E.; 41 degrees, 43 minutes, and 45 seconds north latitude and 117 degrees, 32 minutes, and 20 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil Moisture - Usually moist, moist in winter and spring, dry in summer and early fall.
Soil Temperature - 43 to 47 degrees F.
Mean summer soil temperature - 55 to 59 degrees F.
Depth to bedrock - 8 to 20 inches.
Mollic epipedon - 8 to 20 inches includes the entire profile.
Control section - Clay content: 8 to 18 percent.
Rock fragments: 0 to 35 percent.
A horizon - Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3 dry, 1 through 3 moist.
Bw or C horizons are present in some pedons.
COMPETING SERIES: These are Duncom(WY), Ganis(T WA), Hanagita(AK), Hazton(WY), Heisspitz(T CO), Jenkinson(WY), Lotex(UT), Skisams(CO), Spliten(ID), Splitro(WY), and Trump(CO) series. Duncom and Trump soils have Bk horizons. Ganis soil have mollic epipedon that are 7 to 10 inches thick. Hanagita soils have soil temperatures of 32 to 35 degrees F. Hazton profiles have a high percentage of medium and coarse angular sand. Heisspitz soils contain 18 to 35 percent clay. Jenkinson soils are channery loams or channery clay loams with thin rock fragments ranging from 15 to 35 percent in the control section and have mollic epipedon that are 7 to 12 inches but do not include the entire profile. Lotex soils mollic epipedon does not include the entire profile and have soil temperature of 37 to 43 degrees. Skisams soils are formed under 20 to 30 inches of precipitation and are neutral to mildly alkaline. Spliten soils have mollic epipedon that are 7 to 17 inches, the mollic epipedon do not include the entire profile. Splitro have peak periods of precipitation in the spring and early summer and have mollic epipedon that are 6 to 15 inches but do not include the entire profile.
GEOGRAPHIC SETTING: Udelope soils are on convex hills and mountains. These soils formed in residuum and colluvium from volcanic rocks, commonly andesite. Slopes are 4 to 50 percent. Elevations are 6,000 to 9,000 feet. The climate is cool, semi-arid, with most precipitation falling in winter and early spring. The mean annual precipitation is 16 to 22 inches; mean annual temperature is 40 to 45 degrees F. The frost-free season is 60 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hackwood and Tusel soils. Hackwood and Tusel soils do not have a lithic contact within 20 inches of the surface.
DRAINAGE AND PERMEABILITY: Well drained; medium or rapid runoff; moderate permeability.
USE AND VEGETATION: Rangeland and wildlife habitat. Vegetation is an open stand of mountain mahogany, with mountain sagebrush, snowberry, needlegrass and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Northern and Central Nevada. MLRA 25. These soils are of small extent.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Humboldt County, Nevada, East Part, 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from surface to 18 inches. (A1, A2, A3, and Bw horizons)
Lithic contact - The boundary with hard rock at about 18 inches.
Particle-size Control Section - the zone from 10 to 18 inches.