LOCATION SUP NVEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Xeric Haplocryolls
TYPICAL PEDON: Sup stony loam, rangeland. (Colors are for dry soil unless otherwise noted.)
The surface is covered with 2 percent stones, 5 percent cobbles, and 20 percent pebbles.
All--0 to 2 inches; dark grayish brown (l0YR 4/2) stony loam, very dark brown (l0YR 2/2) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine tubular pores; 2 percent stones, 5 percent cobbles and 20 percent pebbles; slightly acid (pH 6.2); abrupt smooth boundary. (2 to 4 inches thick)
Al2--2 to 6 inches; grayish brown (l0YR 5/2) very gravelly fine sandy loam, very dark grayish brown (l0YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine tubular pores; 30 percent pebbles and l5 percent cobbles; slightly acid (pH 6.2); abrupt smooth boundary. (2 to 6 inches thick)
Al3--6 to l2 inches; brown (l0YR 5/3) very gravelly sandy loam, dark brown (l0YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; many very fine, common fine and medium, and few coarse roots; many very fine and few medium and coarse tubular pores; 30 percent pebbles and l5 percent cobbles; slightly acid (pH 6.2); abrupt irregular boundary. (4 to 8 inches thick)
Cl--l2 to 22 inches; pinkish gray (7.5YR 6/2) extremely gravelly sandy loam, dark brown (7.5YR 3/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine through coarse roots; few very fine, fine and medium tubular pores; 50 percent pebbles and 20 percent cobbles; medium acid (pH 6.0); clear wavy boundry. (6 to l2 inches thick).
C2--22 to 3l inches; light brownish gray (l0YR 6/3); extremely gravelly fine sandy loam, dark brown (l0YR 3/3) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; 50 percent pebbles and 25 percent cobbles; medium acid (pH 6.0); abrupt wavy boundary. (7 to l2 inches thick.)
C3--31 to 39 inches; (10YR 4/4) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; 50 percent pebbles and 25 percent cobbles; medium acid (pH 6.0); clear wavy boundary. (6 to l0 inches thick.)
C4--39 to 60 inches; light brownish gray (l0YR 6/2) very cobbly sandy loam, dark brown (l0YR 4/3) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; 20 percent pebbles and 20 percent cobbles; medium acid (pH 5.6).
TYPE LOCATION: Douglas County, Nevada; about 3/4 mile north of Mount Como; approximately l,500 feet north and 750 feet west of southeast corner of section 35, T. l4 N., R. 22 E.
RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry August thru October.
Soil temperature: 44 to 47 degrees F. (7 to 8 degrees C) mean. Average summer soil temperature: 53 to 57 degrees F. (l2 to l4 degrees C.) Mollic epipedon thickness:8 to l6 inches.
Control section:
Percent clay: 5 to l5.
Rock fragments: 45 to 75 percent of which 30 to 50 percent are pebbles, l5 to 25 percent are cobbles.
Texture: Stratified very gravelly or extremely gravelly coarse sandy loam, sandy loam, fine sandy loan, and loam.
Depth to bedrock: 40 to over 60 inches.
Reaction: Medium acid or slightly acid. Base saturation is 50 to 75 percent.
Other features: Some pedons have a very thin surface organic layer.
Al horizon
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3.
C horizon
Hue: l0YR or 7.5YR.
Value: 5, 6, or 7 dry. 3 or 4 moist.
Chroma: 2, 3, or 4.
COMPETING SERIES: These are the Antrobus, Brickel, Broad Canyon, Decram, Fairydell, Farlow, Foxmount, Grafen, Greyback, Handran, Kamack, Maurice, McCort, Midelight, Midfork, Parachute, Sebud, Silvercliff, Supervisor, Teemat, Thornburgh, Tiban, and Tineman series. Antrobus, Fairydell, Farlow, Greyback, Midelight, Midfork, Silvercliff, and Teemat soils have calcareous horizons. Brickel, Decram, Foxmount, Grafen, Kamack, Parachute, and Supervisor soils have bedrock within 40 inches of the surface. Broad Canyon and Tineman soils have a discontinuity of very stony loamy sand or very gravelly sand within 40 inches. Tiban soils have 25 to 35 percent clay in the particle-size control section. Maurice soils are neutral through moderately alkaline. McCort soils have hue of 7.5YR or 5YR in the B horizon. Sebud soils have mainly stones and boulders and have 20 to 35 percent clay. Thornburgh soils are neutral or mildly alkaline and mainly have channery rock fragments. Handran soils have mostly stone in the profile and the soil is moist mainly during spring and summer months.
GEOGRAPHIC SETTING: Sup soils are on concave mountain side slopes. Elevations range from 7,000 to 9,000 feet. The soils formed in colluvium from granitic and andesitic rock. The climate is cold with most pre cipitation occurring during late fall, winter and spring. Mean annual precipitation is l6 to 20 inches; mean annual temperature is 40 to 45 degrees F.; frost-free season is 50 to 60 days. Slopes are l5 to 50 percent.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Genoa and Glean soils. Genoa soils have an argillic horizon and a lithic contact at less than 20 inches. Glean soils have a mollic epipedon more than 20 inches thick.
DRAINAGE AND PERMEABILITY: Well drained; medium or rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Livestock grazing and wildlife habitat. The vegetation is mainly curlleaf mountain mahagony, mountain big sagebrush, Nevada bluegrass, basin wildrye, and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Western Nevada. The soil is of moderate extent.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Douglas County, Nevada, l98l.