LOCATION CORZUNI NMEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Typic Haplustalfs
TYPICAL PEDON: Corzuni loamy fine sand--in a ponderosa pine woodland on an east facing, convex-linear, 3 percent slope at an elevation of 7,140 feet (Colors are for dry soils unless otherwise noted.)
Oi--0 to 1 inches; slightly decomposed pine needles and grasses
A--1 to 8 inches; brown (7.5YR 5/2) loamy fine sand, dark brown (7.5YR 3/2) moist; single grain structure; loose, loose, nonsticky and nonplastic; many very fine and fine roots; neutral (pH 7.0); abrupt smooth boundary. (3 to 8 inches thick)
Bt1--8 to 29 inches; brown (7.5YR 5/4) fine sandy loam, brown (7.5YR 4/4) moist; moderate fine subangular blocky structure; soft, very friable, nonsticky and non plastic; common very fine and fine roots; few very fine irregular pores; few distinct clay films on faces of peds and bridging sand grains; neutral (pH 7.2); clear smooth boundary. (12 to 21 inches thick)
Bt2--29 to 45 inches; strong brown (7.5YR 5/6) fine sandy loam, strong brown (7.5YR 4/6) moist; weak very fine and fine subangular blocky structure; soft, very friable, nonsticky and non plastic; few very fine roots; few distinct clay films on faces of peds and bridging sand grains; neutral (pH 7.2); abrupt smooth boundary. (13 to 23 inches thick)
Bk--45 to 71 inches; strong brown (7.5YR 5/6) fine sandy loam, strong brown (7.5YR 4/6) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few very fine roots; very slightly effervescent; few very fine calcium carbonate masses; slightly alkaline (pH 7.8). (0 to 26 inches thick)
TYPE LOCATION: McKinley County, New Mexico; about 4.1 miles north of Ramah, New Mexico; Ramah Quadrangle; about 2,050 feet north and 2,500 feet west of the southeast corner of sec. 11, R. 16 W., T. 11 N.; 108 degrees 29 minutes 42 seconds west longitude, 35 degrees 11 minutes 50 seconds north latitude.
RANGE IN CHARACTERISTICS:
Soil Moisture: The SMCS is usually moist, in some part, for more than 90 cumulative days from May through October. It is usually dry, in all parts, for less than 90 cumulative days during the same period. It is continuously moist in some part November through April. The period of maximum precipitation is July through October. The soil is driest during May and June. Typic ustic moisture regime.
Soil Temperature: 47 to 49 degrees F
Particle size control section: 8 to 18 percent clay
A horizon
Hue: 7.5YR or 10YR
Value: 5 dry, 3 moist
Reaction: Neutral to slightly alkaline
Bt horizon
Hue: 7.5YR or 10YR
Value: 5 dry, 3 or 4 moist
Chroma: 4 or 6 dry, 3 to 6 moist
Reaction: Neutral to slightly alkaline
Bk horizon
Hue: 5YR or 7.5YR
Value: 5 dry, 4 moist
Textures: fine sandy loam, sandy clay loam, silty clay loam, or silty clay
Reaction: slightly to moderately alkaline
COMPETING SERIES: There are no competitors.
GEOGRAPHIC SETTING: The Corzuni soils formed in eolian and fan alluvium derived from sandstone and are on fan remnants on valley sides and dipslopes of cuestas. Slopes are 2 to 10 percent. Elevations range from 7,000 to 7,500 feet. The mean annual temperature is 45 to 48 degrees F., and the mean annual precipitation is 16 to 20 inches. The frost free period is 90 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bluesky, Fikel, Shoemaker, Stozuni, Venzuni, and Zunalei soils. Bluesky soils are very shallow and shallow on cuesta and mesas escarpments. Fikel and Venzuni soils are fine textured and mesic on valley floors. The Shoemaker and Stozuni soils are moderately deep and shallow on mesas, cuestas, and hills. The Zunalei soils are very deep and are on valley sides.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained, low runoff, and moderately rapid permeability.
USE AND VEGETATION: This series is used for wood products and wildlife habitat. The present vegetation is ponderosa pine woodland with associated pinyon pine, Gambel oak, and Rocky Mountain juniper. Understory vegetation is pine dropseed, bottlebrush squirreltail, prairie junegrass, muttongrass, and broom snakeweed.
DISTRIBUTION AND EXTENT: West central, New Mexico; MLRA 39, LRR-D. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: McKinley County Area, New Mexico; McKinley County and Parts of Cibola and San Juan Counties, 2001.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 7 inches. (A horizon)
Argillic horizon: The zone from 7 to 44 inches. (Bt1 and Bt2)
Classified according to Soil Taxonomy Second Edition, 1999.