LOCATION BRINKERHOFF AZEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Typic Haplargids
TYPICAL PEDON: Brinkerhoff sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 1 inch; brown (7.5YR 5/4) sandy loam, brown (7.5YR 4/4) moist; weak thin platy structure parting to weak fine granular; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; 5 percent gravel; slightly alkaline (pH 7.6); abrupt smooth boundary. (1 to 4 inches thick)
A2--1 to 4 inches; brown (7.5YR 5/4) sandy loam, dark brown (7.5YR 3/4) moist; weak thick platy structure parting to weak fine granular; slightly hard, very friable, nonsticky and nonplastic; common fine roots; common fine tubular pores; 5 percent gravel; slightly alkaline (pH 7.8); abrupt smooth boundary. (0 to 4 inches thick)
Bt1--4 to 12 inches; yellowish red (5YR 4/6) sandy loam, reddish brown (5YR 4/4) moist; weak coarse prismatic structure parting to moderate medium subangular blocky; slightly hard, friable, nonsticky and nonplastic; common fine roots; common very fine tubular pores; common thin clay films on faces of peds and lining pores; 5 percent gravel; slightly alkaline (pH 7.8); clear wavy boundary. (6 to 14 inches thick)
Bt2--12 to 17 inches; yellowish red (5YR 4/6) sandy loam, reddish brown (5YR 5/4) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; few very fine tubular pores; common thin clay films on faces of peds and lining pores; 5 percent gravel; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 19 inches thick)
Bk--17 to 22 inches; light brown (7.5YR 6/4) loamy sand, brown (7.5YR 5/4) moist; weak medium subangular blocky structure; slightly hard, very friable; few very fine roots; common fine tubular pores; violently effervescent, few medium soft lime masses; common large krotovinas; 10 percent gravel; moderately alkaline (pH 8.4); clear wavy boundary. (2 to 7 inches thick)
By1--22 to 28 inches; light brown (7.5YR 6/4) loamy sand, brown (7.5YR 5/4) moist; massive; slightly hard, very friable; few very fine roots; violently effervescent; common large krotovinas; few very fine gypsum crystals; 10 percent gravel; moderately alkaline (pH 8.4); clear wavy boundary. (0 to 8 inches thick)
2By2--28 to 50 inches; light brown (7.5YR 6/4) and reddish brown (5YR 5/4) gravelly coarse sand, yellowish red (5YR 4/6) moist; massive; slightly hard, very friable; many medium interstitial pores; violently effervescent; many sand size gypsum crystals; 30 percent gravel; moderately alkaline (pH 8.4); gradual wavy boundary. (10 to 22 inches thick)
2By3--50 to 60 inches; strong brown (7.5YR 5/6) gravelly coarse sand, yellowish red (5YR 4/6) moist; massive; loose; strongly effervescent; few sand size gypsum crystals; 15 percent small pebbles; moderately alkaline (pH 8.4).
TYPE LOCATION: Mohave County, Arizona; 16 miles west and 6 miles south of Pipe Spring National Monument; 800 feet south and 400 feet west of the northeast corner of section 23, T. 39 N., R. 7 W.
RANGE IN CHARACTERISTICS:
Soil Moisture: Intermittently moist in some part of the moisture control section during July-September and December-March. Driest during May and June. Typic aridic soil moisture regime.
Rock Fragments (particle-size control section): ranges from 5 to 40 percent, averages 5 to 30 percent gravel
Depth to gypsum: 20 to 30 inches
A horizon
Hue: 5YR, 7.5YR
Value: 4 through 6 dry, 4 or 5 moist
Chroma: 4 or 6, dry and moist
Reaction: slightly or moderately alkaline
Bt horizon
Hue: 5YR, 7.5YR
Value: 4 through 6 dry, 3 through 5 moist
Chroma: 4 through 6, dry and moist
Reaction: slightly or moderately alkaline
Bk and By horizons
Hue: 5YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 4 through 6, dry and moist
Reaction: slightly or moderately alkaline
Texture: sandy loam, loamy sand, coarse sand
COMPETING SERIES: These are the Chacoan (NM), Delp (NV), Enos (WY), Granshaw (NV), Mayqueen (NM), Shiprock (NM), Wallson (WY) and Woolsey (NV) series. These soils do not have a layer of gypsum above 40 inches.
GEOGRAPHIC SETTING: Brinkerhoff soils are on fan terraces at elevations of 4,600 to 5,l00 feet. These soils formed in alluvium from sandstone and gypsiferous shale. Slopes range from 1 to 5 percent. The mean annual precipitation is 7 to 11 inches. The mean annual air temperature is 55 to 57 degrees F. The frost-free period is 165 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Grieta, Saido and Jocity soils. Grieta and Jocity soils are fine-loamy. Saido soils are coarse-silty.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderate permeability.
USE AND VEGETATION: Brinkerhoff soils are used for livestock grazing. The present vegetation is galleta, sand dropseed, blue grama and fourwing saltbush.
DISTRIBUTION AND EXTENT: Northern Arizona. This series is of small extent. MLRA 35.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Mohave County, Arizona; Soil survey of Mohave County Area, Arizona, Northeastern Part and Part of Coconino County; 1992.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 4 inches (A1, A2 horizons)
Argillic horizon - The zone from 4 to 17 inches (Bt1, Bt2 horizons)
ADDITIONAL DATA: NSSL sample S82AZ-015-008