LOCATION GYPBOY CA
Established Series
Rev: JCR/LJL/ET
04/2015
GYPBOY SERIES
The Gypboy series consists of very deep, well drained soils that formed in sandy and silty eolian deposits over lacustrine deposits. Gypboy soils are on hummocks on lake plains and have slopes of 4 to 15 percent. The mean annual precipitation is about 4 inches and the mean annual air temperature is about 72 degrees F.
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, hyperthermic Gypsic Haplosalids
TYPICAL PEDON: Gypboy very fine sandy loam on an east-facing, convex, 6 percent slope at an elevation of 611 feet. (Colors are for dry soil unless otherwise noted.) The surface is covered by approximately 2 percent gravel.
Anyz--0 to 3 inches; pale brown (10YR 6/3) very fine sandy loam, brown (10YR 4/3) moist; moderate very coarse platy structure breaking to weak coarse subangular blocky; slightly hard, very friable, slightly sticky and nonplastic; common very fine, fine and medium roots; few very fine and fine interstitial and tubular pores; electrical conductivity of 181 dS/m; sodium adsorption ratio is 156; slightly effervescent; slightly alkaline (pH 7.6); clear broken boundary. (1 to 3 inches thick)
Bnyz--3 to 9 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 4/3) moist; moderate very coarse subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common very fine, fine and medium and few coarse roots; few very fine and fine interstitial pores; electrical conductivity of 248 dS/m; sodium adsorption ratio is 214; 3 percent very fine gypsum crystals; slightly effervescent; slightly alkaline (pH 7.8); clear wavy boundary. (5 to 25 inches thick)
2Bnyz1--9 to 16 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; moderate very coarse subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine and fine and common medium roots; few very fine and fine interstitial and few fine tubular pores; electrical conductivity 175 of dS/m; sodium adsorption ratio is 138; 5 percent irregular fine and medium masses of gypsum throughout; slightly effervescent; slightly alkaline (pH 7.8); clear wavy boundary. (4 to 10 inches thick)
2Bnyz2--16 to 48 inches; pale brown (10YR 6/3) stratified gypsiferous silt loam to loam, brown (10YR 4/3) moist; massive; slightly hard, very friable; common very fine and few fine interstitial pores; electrical conductivity of 104 dS/m; sodium adsorption ratio is 95; 15 percent medium and coarse, very firm and extremely firm, brittle irregular gypsum crystals throughout; 3 percent fine irregular masses of gypsum throughout; very slightly effervescent; slightly alkaline (pH 7.6).
2Bnyz3--48 to 60 inches; pale brown (10YR 6/3) stratified gypsiferous silt loam and loam, brown (10YR 4/3) moist; massive; slightly hard, very friable; common very fine and few fine interstitial pores; electrical conductivity of 73 dS/m; sodium adsorption ratio is 123; 15 percent medium and coarse, very firm and extremely firm, brittle irregular gypsum crystals throughout; 3 percent fine irregular masses of gypsum throughout; very slightly effervescent; slightly alkaline (pH 7.8).
TYPE LOCATION: San Bernardino County, California; about 7 miles west and 1 mile south of Amboy, and 2.7 miles south of Bagdad California, on Dry Lake; 400 feet north and 300 feet east of the southwest corner of section 6, T. 5 N., R. 11 E.; 34 degrees, 32 minutes, 38.8 seconds north latitude and 115 degrees, 52 minutes, 25.7 seconds west longitude; Amboy Crater quadrangle; UTM 11S, 0603338e 3822869n; NAS-C.
RANGE IN CHARACTERISTICS:
Soil moisture - usually dry, moist in some part for short periods during winter and early spring and for 10 to 20 days cumulative between July and October following convection storms. The soils have a Typic-Aridic moisture regime.
Soil temperature: 72 to 77 degrees F.
Depth to gypsic horizon: 3 to 24 inches
Organic matter: 0 to 0.5 percent.
Particle-size control section - Clay content: 8 to 18 percent.
Calcium carbonate equivalent of the less than 2mm fraction: 0 to 5 percent.
Anyz horizon - Consistence: slightly or moderately hard, nonsticky or slightly sticky.
Clay content: 5 to 10 percent.
Effervescence: slightly or strongly effervescent.
Reaction: slightly or moderately alkaline.
Electrical conductivity: 125 to 225 dS/m.
Sodium adsorption ratio: 130 to 200.
Bnyz horizon - Structure: Weak or moderate, coarse or very coarse subangular blocky.
Consistence: nonsticky or slightly sticky.
Clay content: 6 to 12 percent.
Reaction: slightly or moderately alkaline.
Electrical conductivity: 200 to 300 dS/m.
Sodium adsorption ratio: 150 to 250.
Other features: 0 to 5 percent gypsum as crystals and masses.
2Bnyz1 horizon - Texture of the fine earth: sandy loam or loam.
Structure: subangular blocky or massive.
Consistence: nonplastic or slightly plastic.
Clay content: 8 to 15 percent.
Reaction: slightly or moderately alkaline.
Electrical conductivity: 125 to 225 dS/m.
Sodium adsorption ratio: 91 to 150.
Other features: 3 to 10 percent gypsum as crystals and masses.
2Bnyz2 and 2Bnyz3 horizons - Hue: 10YR or 7.5YR.
Chroma: 3 or 4 dry or moist.
Texture of the fine earth: loam, silt loam, or a stratified combination of both.
Consistence: slightly or moderately hard, friable or very friable, and slightly or moderately sticky.
Clay content: 10 to 18 percent.
Effervescence: very slightly to strongly effervescent.
Reaction: neutral to moderately alkaline.
Electrical conductivity: 70 to 150 dS/m.
Sodium adsorption ratio: 91 to 150.
Other features: 5 to 20 percent gypsum as crystals and masses.
COMPETING SERIES: These are the
Amboy Crater soils. Amboy Crater soils are on smooth nearly level lake plains and have an electrical conductivity of 17 to 70 dS/m in the particle-size control section.
GEOGRAPHIC SETTING: Gypboy soils are on hummocks on lake plains. These soils formed in sandy and silty eolian deposits over lacustrine deposits. Elevations are 590 to 700 feet. The climate is arid with hot, dry summers and warm, moist winters. The mean annual precipitation is 2 to 5 inches; mean annual air temperature is 69 to 75 degrees F., and the frost-free season is 300 to 360 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Amboy Crater soils. The Amboy Crater soils are on smooth lake plains.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Gypboy soils are used for military exercises and wildlife habitat. The present vegetation is mainly iodinebush and Mojave seablite.
DISTRIBUTION AND EXTENT: Mojave Desert of southeastern California, MLRA 30. These soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA
SERIES ESTABLISHED: San Bernardino County, California, Marine Corps Air/Ground Combat Center Soil Survey Area, 2000. The name is coined.
REMARKS: Diagnostic horizons and features recognized in the profile are:
1. Ochric epipedon--0 to 3 inches (Anyz horizon).
2. Salic horizon--0 to 60 inches (Anyz, Bnyz, and 2Bnyz horizons).
3. Gypsic horizon--3 to 60 inches (Bnyz, 2Bnyz1, 2Bnyz2, and 2Bnyz3 horizons).
3. Particle-size control section--10 to 40 inches (part of the 2Bnyz1 and 2Bnyz2 horizons).
Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 1/2001. ET
National Cooperative Soil Survey
U.S.A.