LOCATION TRID NVEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Aridic Argixerolls
TYPICAL PEDON: Trid very stony loam, rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 1 inch, dark grayish brown (10YR 4/2) very stony fine sandy loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine vesicular pores; 35 percent pebbles, 10 percent cobbles, 10 percent stones; slightly acid (pH 6.2); abrupt smooth boundary. (1 to 2 inches thick.)
A2--1 to 3 inches; dark grayish brown (10YR 4/2) very gravelly loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; few very fine roots; common very fine interstitial pores; 50 percent pebbles; neutral (pH 6.8); abrupt smooth boundary. (2 to 7 inches thick.)
A3--3 to 6 inches; dark grayish brown (10YR 4/2) extremely gravelly loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; few very fine, fine, and medium roots; many very fine, common fine, and few medium tubular pores; 65 percent pebbles; neutral (pH 7.2); abrupt wavy boundary. (2 to 6 inches thick.)
Bt1--6 to 11 inches; brown (10YR 5/3) extremely gravelly clay loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; soft, very friable, sticky and plastic; few very fine, fine, and medium roots; many very fine tubular pores; common thin clay films on peds faces and lining pores; 65 percent pebbles; neutral (pH 7.0); clear smooth boundary. (4 to 10 inches thick.)
Bt2--11 to 20 inches; brown (7.5YR 5/4) extremely gravelly clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; hard, friable, sticky and plastic; few very fine, fine medium and coarse roots; many very fine tubular pores; continuous thin clay films on ped faces and lining pores; 60 percent pebbles; neutral (pH 7.0); clear smooth boundary. (4 to 10 inches thick.)
Bt3--20 to 34 inches; yellowish brown (10YR 5/4) extremely gravelly clay loam, dark yellowish brown (10YR 3/4) moist; common fine tubular pores; common thin clay films lining pores; 65 percent pebbles; neutral (pH 7.2); clear smooth boundary. (0 to 16 inches thick.)
Cr--34 inches; weathered granitic rock with clay films lining weak fracture planes.
TYPE LOCATION: Douglas County, Nevada; about five miles north and 13 miles east of Gardnerville, Nevada; about 500 feet east and 100 feet south of the north quarter corner of section 20, T. 14 N., R. 22 E.
RANGE IN CHARACTERISTICS:
Soil moisture - Usually dry during summer and fall; moist November to June.
Soil temperature: 47 to 52 degrees F.
Mollic epipedon thickness: 8 to 12 inches, includes the upper part of the argillic horizon.
Depth to paralithic contact: 20 to 40 inches.
Control section - Percent clay: 25 to 35 percent.
Rock fragments: 55 to 75 percent, mainly pebbles.
A horizon Hue: 10YR or 7.5YR.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 1 through 3.
Rock fragments: 0 to 55 percent, mainly fine pebbles, 0 to 35 percent cobbles or stones.
Reaction: Slightly acid or neutral.
Bt1 and Bt2 horizon Hue: 7.5YR, 10YR or 2.5Y.
Value (upper part): 4 or 5 dry, 3 or 4 moist. (lower part) 4 through 6 dry, 3 or 4 moist.
Chroma: 2 through 4 with the lower chromas in upper part.
Texture: Very or extremely gravelly sandy clay loam or clay loam.
Bt3 horizon Texture: Coarse sandy loam, loam or clay loam, modified by 40 to 65 percent rock fragments.
COMPETING SERIES: These are the Ashue, Badenaugh, Collard, Ister, Lemm, Leviathan, Nosrac, Oest, Searles, Shree, Shroe, Tollgate, Tristan and Vantage series. Ashue, Badenaugh, Collard, Lemm, Leviathan, Nosrac, Oest, Shree, Shroe, Tollgate, and Tristan soils lack a lithic or paralithic contact within 40 inches. Ister, Searles, and Vantage soils are moderately deep to a lithic contact.
GEOGRAPHIC SETTING: Trid soils are on mountain back slopes, with mainly a south aspect at elevations of 5,500 to 7,500 feet. Slopes are 4 to 50 percent. The soils formed in residuum weathered from granitic rocks with some colluvial influence. The climate is dry, with warm summers and moist, cool winters. The average annual precipitation is 12 to 14 inches, mainly as snow; mean annual temperature is 45 to 50 degrees F. The frost- free season is 90 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Drit, Glean, Minneha, and Roloc soils. Drit soils are deep and lack an argillic horizon. Glean soils are deep, lack an argillic horizons and have a frigid soil temperature. Minneha soils are shallow. Roloc soils are shallow to a paralithic contact.
DRAINAGE AND PERMEABILITY: Well drained; rapid runoff; moderately slow permeability.
USE AND VEGETATION: Livestock grazing and wildlife habitat. The vegetation is principally mountain big sagebrush, antelope bitterbrush, ribes, and Thurbers needlegrass with invasion of pinyon pine.
DISTRIBUTION AND EXTENT: Western Nevada. The soils are of small extent.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Douglas County Area, Nevada, 1981.
Diagnostic horizon and features recognized in this pedon are:
Mollic epipedon - The zone from 0 to 11 inches (A1, A2 and Bt1 horizon)
Argillic horizon - The zone from 6 to 34 inches (Bt1 Bt2 and Bt3 horizon)
Particle zize control section - The zone from 6 to 26 inches (Bt1, Bt2 and part of the Bt3 horizon)
Paralithic contact - The boundary beginning at 34 inches (Cr horizon).