LOCATION IVANPATCH AZEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Leptic Haplogypsids
TYPICAL PEDON: Ivanpatch fine sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 2 inches; light reddish brown (5YR 6/4) fine sandy loam, reddish brown (5YR 4/4) moist; moderate thin platy structure; slightly hard, very friable, slightly sticky and nonplastic; many fine and very fine roots; many very fine vesicular and common fine tubular pores; disseminated calcium carbonate; strongly effervescent, 24 percent calcium carbonate equivalent; 2 to 3 percent crystalline gypsum as sand grains; moderately alkaline (pH 8.0); abrupt smooth boundary. (1 to 2 inches thick)
By1--2 to 11 inches; reddish yellow (5YR 6/6) loam, yellowish red (5YR 4/6) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; many fine and very fine roots; common fine and very fine tubular pores; disseminated calcium carbonate; strongly effervescent, 22 percent calcium carbonate equivalent; 5 percent crystalline gypsum as sand grains; moderately alkaline (pH 8.0); clear smooth boundary. (5 to 10 inches thick)
By2--11 to 25 inches; reddish yellow (5YR 6/6) loam, yellowish red (5YR 4/6) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; common fine and very fine roots; common fine and very fine tubular and interstitial pores; disseminated calcium carbonate; strongly effervescent, 23 percent calcium carbonate equivalent; 10 percent crystalline gypsum as sand grains and small clusters of crystals; slightly alkaline (pH 7.8); clear smooth boundary. (10 to 20 inches thick)
By3--25 to 46 inches; reddish yellow (5YR 6/6) loam, yellowish red (5YR 4/6) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; common fine and very fine roots; common fine and very fine tubular and interstitial pores; disseminated calcium carbonate; strongly effervescent, 21 percent calcium carbonate equivalent; 20 percent crystalline gypsum as sand grains and small clusters of crystals; slightly alkaline (pH 7.8); clear smooth boundary. (10 to 25 inches thick)
By4--46 to 62 inches; reddish yellow (5YR 6/6) loam, yellowish red (5YR 4/6) moist; massive; soft, very friable, slightly sticky and slightly plastic; few fine and very fine roots; common fine and very fine tubular pores; disseminated calcium carbonate; strongly effervescent, 15 percent calcium carbonate equivalent; 15 percent crystalline gypsum as sand grains and small clusters of crystals; slightly alkaline (pH 7.8).
TYPE LOCATION: Mohave County, Arizona; about 3 miles north of Mt. Trumbull Settlement; 700 feet north and 800 feet east of the southwest corner of section 1, T.35 N., R.10 W.; 36 degrees 27 minutes 28 seconds north latitude and 113 degrees 19 minutes 18 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil Moisture: Intermittently moist in some part of the soil moisture control section during July - September and December - February. Driest during May and June. Ustic Aridic soil moisture regime.
Rock Fragments: 0 to 15 percent gravel
Soil Temperature: 47 to 59 degrees F.
Organic Matter: 0.5 to 1.0 percent in the upper 1 to 8 inches
Depth to gypsic horizon: 1 to 7 inches, (5 to 25 percent gypsum); gypsum times thickness in cm above 150 cm depth is less than 3000.
A horizon
Hue: 5YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 through 6, dry or moist
Texture: fine sandy loam, very fine sandy loam, loam (5 to 18 percent clay)
Reaction: slightly to moderately alkaline
Effervescence: slight to strong, 1 to 25 percent calcium carbonate equivalent
Gypsum: 0 to 10 percent
By horizons
Hue: 5YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 through 6, dry or moist
Texture: fine sandy loam, very fine sandy loam, loam (5 to 18 percent clay)
Reaction: slightly to moderately alkaline
Effervescence: slight to strong, 5 to 25 percent calcium carbonate equivalent
Gypsum: 5 to 25 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Ivanpatch soils are on fan terraces and have slopes of 1 to 10 percent. These soils formed in alluvium derived dominantly from sedimentary formations high in gypsum and calcium carbonate. Elevations range from 4800 to 6000 feet. The mean annual air temperature is 45 to 57 degrees F. Mean annual precipitation is 10 to 14 inches. The frost-free period is 150 to 165 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Barx, Mellenthin, and Tanbark soils. Barx soils have argillic horizons. Mellenthin soils are shallow to a lithic contact. Tanbark soils have gypsic mineralogy and are shallow to gypsic rock.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate permeability.
USE AND VEGETATION: Ivanpatch soils are used for livestock grazing and wildlife habitat. The present vegetation is gyp dropseed, galleta, Indian ricegrass, big sagebrush, juniper, fourwing saltbush, and broom snakeweed.
DISTRIBUTION AND EXTENT: Northwestern Arizona. The series is of limited extent. MLRA is 35.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Mohave County, Arizona; Soil survey of the Shivwits Area, Arizona, Part of Mohave County; 1994.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 2 inches (A horizon)
Gypsic horizon - The zone from 2 to 62 inches (By1, By2, By3, By4 horizons)
Formerly classified as Cambic Gypsiorthids.