LOCATION DOAK NM AZEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Typic Haplargids
TYPICAL PEDON: Doak fine sandy loam-in rangeland on a convex, east facing, 2 percent slope at an elevation of 6,420 feet. (Colors are for dry soil unless otherwise stated.)
A--0 to 2 inches; yellowish brown (10YR 5/4) fine sandy loam, dark yellowish brown (10YR 4/4) moist; moderate fine granular structure; soft, friable, nonsticky and nonplastic; common very fine and fine roots; common fine irregular pores; slightly effervescent; slightly alkaline; (pH 7.6); abrupt smooth boundary. (2 to 6 inches thick)
Bt--2 to 8 inches; brown (7.5YR 5/4) sandy clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine tubular pores; common distinct clay films on faces of peds and lining pores; slightly alkaline (pH 7.6); abrupt smooth boundary. (5 to 20 inches thick)
Btk--8 to 12 inches; brown (7.5YR 5/4) sandy clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine tubular pores; common distinct clay films on faces of peds and lining pores; slightly effervescent; few fine irregular seams and filaments of calcium carbonate; slightly alkaline (pH 7.6); clear smooth boundary. (4 to 29 inches thick)
Bk1--12 to 40 inches; brownish yellow (10YR 6/6) sandy clay loam, yellowish brown (10YR 5/6) moist; massive; slightly hard, friable, slightly sticky and nonplastic; common very fine roots; few very fine and fine irregular pores; violently effervescent; few fine irregular seams and filaments of calcium carbonate; moderately alkaline (pH 8.2); gradual smooth boundary.
Bk2--40 to 65 inches; brownish yellow (10YR 6/6) sandy clay loam, yellowish brown (10YR 5/6) moist; massive; slightly hard, friable, slightly sticky and nonplastic; few very fine roots; few very fine and fine irregular pores; violently effervescent; few fine irregular seams and filaments of calcium carbonate; moderately alkaline (pH 8.4). (The combined thickness of the Bk horizons is 0 to 43 inches thick)
TYPE LOCATION: McKinley County, New Mexico; Seven Lakes Quadrangle; about 8 miles north of Seven Lakes, New Mexico; about 800 feet north and 400 feet west of the southeast corner of sec. 24, T. 20 N., R. 11 West; 35 degrees, 56 minutes, 40 seconds north latitude and 108 degrees, 56 minutes, 56 seconds west longitude.
RANGE IN CHARACTERISTICS:
The SMCS is usually dry, in all parts, more than 160 cumulative days from April through October. It is usually moist, in some part, less than 50 cumulative days during the same period. It is intermittently moist in some part November through March. The period of maximum precipitation is July through October. The soil is driest during April, May, and June. Typic aridic moisture regime.
Soil temperature: 52 to 57 degrees F.
Particle-size control section: 18 to 35 percent clay
Reaction: neutral to slightly alkaline in the surface and slightly to strongly alkaline in the subsoil
A horizon
Hue: 10YR or 7.5YR
Value: 4 to 6 dry and 3 to 5 moist
Chroma: 2 to 4
Textures: fine sandy loam, loam, or clay loam
Bt horizon
Hue: 10YR to 5YR
Value: 5 to 8 dry and 4 to 6 moist
Chroma: 3 to 6
Textures: loam, sandy loam, clay loam, or silty clay loam
Btk or Bk horizons
Hue: 10YR to 5YR
Value: 5 to 8 dry and 4 to 7 moist
Chroma: 3 to 6 dry and moist
Textures: loam, sandy loam, sandy clay loam, clay loam, or silty clay loam
Some pedons have C horizons that are stratified below 40 inches
COMPETING SERIES: This is the
Norkiki series. Norkiki soils are moderately deep to sandstone.
GEOGRAPHIC SETTING: Doak soils are on cuesta dipslopes, mesas, plateaus, and fan remnants on valley sides. These soils formed in eolian and fan alluvium derived from sandstone and shale. Slopes range from 0 to 8 percent. Elevations range from 4,700 to 6,800 feet. Mean annual precipitation is 6 to 10 inches. The mean air annual air temperature is 50 to 55 degrees F. The frost-free period is 130 to 180 days. In Arizona precipitation is as much as 11 inches and air temperature as high as 57 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Avalon, Benally, Sheppard, and Shiprock soils. Avalon soils have a calcic horizon. Benally soils are sodium affected and are on structural benches and valley floors. Sheppard soils are sandy and are on dunes. Shiprock soils are moderately coarse textured and are on fan remnants and summits of mesas and cuestas.
DRAINAGE AND PERMEABILITY: Well drained, slow to medium runoff; and moderate to moderately slow permeability.
USE AND VEGETATION: Used mainly for rangeland. Present native vegetation is galleta, blue grama, Indian ricegrass, winterfat, alkali sacaton, and fourwing saltbush.
DISTRIBUTION AND EXTENT: West central, New Mexico and east central Arizona. MLRA 35, LRR-D. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: San Juan County, New Mexico, 1965.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: the zone from 0 to 2 inches. (A horizon)
Argillic horizon: the zone from 2 to 12 inches. (Bt and Btk horizons)
The type location was moved to McKinley County, New Mexico from San Juan County, New Mexico in January 2000. The new type location better typifies the classification, particularly the moisture regime.
Classified according to Soil Taxonomy Second Edition, 1999.