LOCATION BURNSWICK AZ+NMEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Sodic Haplocambids
TYPICAL PEDON: Burnswick sandy clay loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 3 inches; light reddish brown (5YR 6/3) sandy clay loam, reddish brown (5YR 5/3) moist; moderate medium platy structure; soft, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine vesicular pores; 5 percent gravel; noneffervescent; moderately alkaline (pH 8.4); abrupt smooth boundary. (1 to 6 inches thick)
Bwl--3 to 11 inches; reddish brown (5YR 5/3) sandy clay loam, reddish brown (5YR 4/3) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and moderately plastic; many very fine roots; many very fine tubular pores; noneffervescent; moderately alkaline (pH 8.4); clear smooth boundary. (5 to 12 inches thick)
Bw2--11 to 16 inches; reddish brown (5YR 5/3) sandy clay loam, reddish brown (5YR 4/3) moist; weak fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many fine roots; many fine tubular pores; slightly effervescent; moderately alkaline (pH 8.4); clear wavy boundary. (4 to 12 inches thick)
Bknl--16 to 29 inches; reddish brown (5YR 5/3) sandy clay loam, reddish brown (5YR 4/3) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable, moderately sticky and moderately plastic; common fine roots; common fine tubular pores; slightly effervescent; secondary calcium carbonate filling pores and coating faces of peds; strongly alkaline (pH 8.8); clear smooth boundary. (6 to 20 inches thick)
Bkn2--29 to 41 inches; light reddish brown (5YR 6/3) sandy clay loam, reddish brown (5YR 5/3) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common fine and very fine roots; common fine and very fine tubular pores; strongly effervescent; secondary calcium carbonate filling pores and coating faces of peds; strongly alkaline (pH 8.8); clear smooth boundary. (6 to 20 inches thick)
BCn--41 to 53 inches; light reddish brown (5YR 6/3) sandy loam, reddish brown (5YR 5/3) moist; massive; slightly hard, friable, slightly sticky and nonplastic; few very fine roots; few very fine tubular and irregular pores; strongly effervescent; disseminated calcium carbonate; strongly alkaline (pH 8.8); abrupt smooth boundary. (1 to 15 inches thick)
2Bknb--53 to 60 inches; light reddish brown (5YR 6/3) sandy clay loam, reddish brown (5YR 5/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and plastic; l0 percent fine gravel; violently effervescent; common fine and medium calcium carbonate nodules and common thin coatings on gravel; strongly alkaline (pH 8.8).
TYPE LOCATION: Navajo County, Arizona; about 7 miles northwest of Holbrook; about 2,550 feet east of the southwest corner of section 33, T. l9 N., R. 20 E.
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. Moist in the soil moisture control section more than 20 days cumulative in the summer. Typic aridic soil moisture regime.
Soil Temperature - 53 to 58 degrees F.
Rock Fragments - ranges to 25 percent in any one horizon, averages less than 15 percent
Depth to base of cambic horizon - 10 to 30 inches
Salinity- nonsaline to slightly saline
Sodicity- nonsodic to strongly sodic
Organic matter - less than l percent
Reaction - moderately or strongly alkaline
Calcium carbonate: 1 to 15 percent calcium carbonate equivalent; as secondary fillings in pores, small masses, and as coatings on faces of peds or sand grains.
A horizon
Hue: 5YR, 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Bw & Bk horizons
Hue: 5YR, 2.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture: sandy clay loam, clay loam, loam (averages 20 to 35 percent clay in the particle-size control section)
BC and buried Bk horizons
Hue: 5YR, 2.5YR
Value: 5, 6, or 7 dry, 4, 5, or 6 moist
Chroma: 2, 3, or 4, dry or moist
Texture: sandy loam, sandy clay loam, clay loam
COMPETING SERIES: This is the Raph (NV) series. Raph soils are moist for less than 20 days cumulative in the summer months.
GEOGRAPHIC SETTING: Burnswick soils are on fan terraces and have slopes of l to 5 percent. They formed in fan alluvium. Elevations are 4,800 to 6,200 feet. The climate is cool arid continental with a mean annual precipitation of 6 to 10 inches that occurs as summer thunderstorms and winter rain and snow. The mean annual air temperature is 5l to 56 degrees F. The frost-free period is l30 to l90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Claysprings, Jocity, Marcou, Tours, and Sheppard soils. Claysprings soils are fine textured and are shallow to a paralithic contact. Jocity, Tours and Sheppard soils do not have cambic horizons. In addition, the Sheppard soils are in a sandy family. Marcou soils are adjacent and coarse-loamy.
DRAINAGE AND PERMEABILITY: Well drained; moderate runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used for livestock grazing, wildlife habitat, recreation, and to a very limited extent for irrigated cropland. Vegetation consists of alkali sacaton, galleta, black grama, mound saltbush, fourwing saltbush, shadscale, and Mormon-tea.
DISTRIBUTION AND EXTENT: Northern Arizona. The series is of moderate extent. MLRA 35.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Navajo County, Arizona; Soil survey of Navajo County Area, Arizona, Central Part; l994.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 3 inches (A horizon)
Cambic horizon - the zone from 3 to 41 inches (Bw1, Bw2, Bkn1, Bkn2 horizons)
Sodic subgroup - the zone from 16 to 60 inches (Bkn, BCn, 2Bknb horizons)
Classified according to Soil taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Tenth Edition, 2006.
Updates and revisions for the correlation of Ft. Defiance Area (AZ715), February 2008, DWD.