LOCATION ZEUGIRDOR CAEstablished Series
TAXONOMIC CLASS: Medial-skeletal, mixed, frigid Ultic Haploxerands
TYPICAL PEDON: Zeugirdor fragmental on a south-west facing 20 percent slope under a cover of douglas fir, white fir, ponderosa pine, sugar pine and incense cedar at an elevation of 5100 feet. (Colors are for dry soil unless, otherwise stated. When described September 29, 1987, the soil was dry throughout.
Oi--2 to 0 inches; fresh and slightly decomposed litter of needles and twigs.
C--0 to 11 inches; Fragmental material consisting of basaltic andesite, 40 percent gravel, 55 percent cobbles, 5 percent stones with some litter in the interstices. Abrupt smooth boundary. (Combined thickness of the C horizon is 11 to 15 inches thick)
2Ab--11 to 17 inches; brown (7.5YR 5/4) extremely gravelly sandy loam dark brown, (7.5YR 3/4) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few medium, common very fine and fine roots; many very fine interstitial pores; 50 percent gravel, 20 percent cobbles; slightly acid (pH 6.5); abrupt smooth boundary. (5 to 8 inches thick)
2ABb--17 to 26 inches; light brown (7.5YR 6/4) very gravelly sandy loam dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine, common fine and medium roots; common very fine tubular pores; 45 percent gravel, 10 percent cobbles, slightly acid (pH 6.5); gradual smooth boundary. (9 to 12 inches thick)
3Btbl--26 to 47 inches; reddish yellow (7.5YR 6/6) very gravelly sandy clay loam brown, (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; few very fine and common fine roots; common very fine tubular pores; few thin clay films on peds; and few thin clay films in pores; 40 percent gravel, 15 percent cobbles, slightly acid (pH 6.5); clear smooth boundary.
3Btb2--47 to 64 inches; very pale brown (10YR 7/4) very cobbly sandy clay loam strong brown, (7.5YR 4/6) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; few fine and medium roots; many very fine tubular pores; and few thin clay films in pores; 5 percent gravel, 30 percent cobbles, slightly acid (pH 6.1); clear smooth boundary. (Combined thickness of the 3Btbl and 2 horizon is 35 to 45 inches thick)
3Btb3--64 to 85 inches; very pale brown (10YR 7/4) very cobbly sandy clay loam strong brown (7.5YR 5/6) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; few fine and medium roots; many very fine tubular pores; common thin clay films in pores; 5 percent gravel, 30 percent cobbles, 10 percent stones; slightly acid (pH 6.1).
TYPE LOCATION: Shasta County, California; about 6 miles southeast of Burney, 2000 feet east and 750 feet north of the southwest corner of Sec. 21, T 34 N. R. 3 E. Burney SW (Burney Mt. west) quadrangle (7.5 minute series).
RANGE IN CHARACTERISTICS: Thickness of the solum and depth to bedrock is greater than 60 inches. The mean annual soil temperature is 41 to 46 degrees F. The soil temperature exceeds 41 degrees F. from mid May to mid November and exceeds 47 degrees F. from early July to early October. The soil moisture control section (28 to 49 inches) is dry in all parts from mid August to mid October (60 to 90 days) and is moist in all parts from mid November to late June. The particle-size control section (0 to 40 inches) rock fragments mostly basaltic andesite, range from 5 to 15 percent stones, 40 to 70 percent cobbles and 35 to 50 percent gravel. Rock fragments, mostly basaltic andesite, on the soil surface, range from 5 to 20 percent stones, 10 to 60 percent cobbles and 10 to 30 percent gravel. Base saturation by sum of cations ranges from 15 to 30 percent throughout. Aluminum and 1/2 iron (by ammonium oxalate) range from 2.0 to 4.01.0. Volcanic glass content ranges from 15 to 30 percent.
The 2Ab horizon color is 7.5YR 4/4, or 5/4. Moist color is 7.5YR 3/4 or 5YR 3/4. Organic matter ranges from 2 to 3 percent. Rock fragments, mostly gravel and cobbles range from 60 to 80 percent. NaF pH is 10.0 to 11.5.
The 2ABb horizon color is 7.5YR 5/4, 6/4, or 5/6. Moist color is 7.5YR 3/4 or 5YR 3/4. Organic matter ranges from 1 to 2 percent. Rock fragments, mostly gravel and cobbles range from 35 to 60 percent. NaF pH is 10.0 to 11.0.
The 3Btb horizon dry color is 7.5YR 5/6, 6/6 or 10YR 7/4. Moist color is 7.5YR 4/4, 4/6, 5/6, or 5YR 4/6. Organic matter ranges from 0.1 to 0.5 percent. Texture is very gravelly sandy clay loam or very cobbly sandy clay loam. Clay content ranges from 27 to 35 percent. Rock fragments, mostly gravel or cobbles range from 35 to 60 percent. NaF pH is 9.5 to 10.0. Reaction is slightly acid to moderately acid.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Zeugirdor soils are on toeslopes of mountains. Slopes are 2 to 50 percent. These soils formed in material from uplifted tephra buried by talus from basaltic lava flows. Elevation is 4400 to 6800 feet. The climate is subhumid with warm dry summers and cold moist winters. Mean annual precipitation is 35 to 50 inches. Snowfall is 70 to 96 inches. The mean annual temperatures is 39 to 44 degrees F. The mean January temperature is about 28 degrees F. The mean July temperature is about 58 degrees F. Frost free season is 50 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Carberry, Dekkas, Goulder, Scarface, Typic Vitrixerands and Wengler soils. Carberry soils have cambic horizon are medial over loamy skeletal, are 40 to 60 inches deep to hard basalt and are on lava plateaus. Dekkas soils are ashy over sandy or sandy-skeletal, are very deep and are on outwash plains between basaltic lave flows. Goulder soils are medial over loamy-skeletal are very deep and are on mountains and lava plateaus. Scarface soils are fine-loamy, mixed, mesic; are very deep and are on lava plateaus and hills. Typic Vitrixerands have a cambic horizon, vary from medial to medial-skeletal, vary from 20 to over 80 inches deep and are on slopes above Zeugirdor soils. Wengler soils have cambic horizon are ashy-skeletal, are very deep and are on lava plateaus, hills and escarpments.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: This soil is used for timber production. The natural vegetation is Douglas fir, white fir, ponderosa pine, sugar pine, incense-cedar, greenleaf manzanita, snowbush ceanothus.
DISTRIBUTION AND EXTENT: Northeaster California. The soils are not extensive. MLRA is 22.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Shasta County, Intermountain Soil Survey Area, California 1991. Source of name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon the zone from 11 to 26 inches (2Ab 2ABb).
Argillic horizon the zone from 26 to 85 inches (3Btbl, 3Btb2, 3Btb3).