LOCATION COSEY NMEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Alfic Argiustolls
TYPICAL PEDON: Cosey silt loam--mountain grassland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 9 inches; dark grayish brown (10YR 4/2) silt loam, black (10YR 2/1) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine and very fine roots; slightly acid (pH 6.2); clear smooth boundary. (7 to 10 inches thick)
A2--9 to l5 inches; grayish brown (10YR 5/2) silt loam, very dark brown (10YR 2/2) moist; moderate coarse granular structure; soft, very friable, slightly sticky and slightly plastic; common fine and few very fine roots; slightly acid (pH 6.1); clear smooth boundary. (6 to 10 inches thick)
BA--l5 to 28 inches; very pale brown (10YR 7/3) gravelly loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and very fine roots; 10 percent cobbles and 20 percent pebbles; slightly acid (pH 6.4); gradual smooth boundary. (11 to l5 inches thick)
Bt1--28 to 34 inches; very pale brown (10YR 7/3) very gravelly sandy clay loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and very fine roots; common moderately thick clay films on faces of peds; 10 percent cobbles and 50 percent pebbles; slightly acid (pH 6.2); gradual smooth boundary. (6 to 15 inches thick)
Bt2--34 to 60 inches; light brown (7.5YR 6/4) crushed, extremely cobbly clay loam, brown (7.5YR 4/4) moist; strata of very pale brown (10YR 7/3) silty clay loam and brownish yellow (10YR 6/6) sandy loam; weak medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; continuous thick clay films on faces of peds; 40 percent cobbles and 30 percent pebbles; slightly acid (pH 6.2).
TYPE LOCATION: Baca Location No. l, Sandoval County, New Mexico. The pit is about 300 feet south of a point on the pipeline roadabout 2 miles southeast of road junction at the western end of Toledo Valley. New Mexico state plane coordinates N. 1,800,000 feet and E. 436,303 feet.
RANGE IN CHARACTERISTICS:
Stones and boulders in surface layers: 0 to 10 percent
Depth to argillic horizon: 22 to 35 inches
Particle-size control section:
Rock fragment content: 35 to 70 percent
A horizon: Value 3, 4 or 5 dry, 2 or 3 moist
Chroma: 1 to 3
Textures: loam, silt loam
Reaction: slightly acid or neutral
BA horizon: Value: 6 through 8 dry, 4 through 6 moist
Chroma: 2 or 3
Texture: gravelly sandy loam, gravelly fine sandy loam, gravelly loam
Reaction: slightly acid or neutral
Bt horizon: Hue 7.5YR or 10YR
Value: 4 to 7 dry, 3 to 5 moist
Chroma: 3 or 4
Texture: clay loam or sandy clay loam, with very gravelly or extremely cobbly modifiers
Reaction: slightly acid or neutral
COMPETING SERIES: These are the Harpole and Isolation series. Harpole soils are sandy in the lower part. Isolation soils average less than 20 percent clay in the control section and contain greater than 15 percent mica.
GEOGRAPHIC SETTING: Cosey soils are on mountain slopes and have slopes of 2 to 20 percent. Elevations are 8,600 to 9,200 feet. The soils are formed in alluvium and colluvium derived from rhyolite. The climate is subhumid continental with mean annual precipitation of about 20 to 32 inches. The mean annual temperature is about 40 to 45 degrees F., and the frost free season is about 60 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hesperus, Jarmillo, Jarola. Palon, Santarosa, and Tranquilar soils. Jarmillo soils have less than 35 percent rock fragments in the control section and lack an argillic horizon. Jarola and Santarosa soils are poorly drained. Palon soils lack a mollic epipedon. Tranquilar soils are somewhat poorly drained and have an argillic horizon with more than 35 percent clay. Hesperus soils are nonskeletal.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: Cosey soils are used mainly for grazing. The native vegetation is mainly Arizona fescue, Thurber fescue, and pine dropseed.
DISTRIBUTION AND EXTENT: Northcentral New Mexico. MLRA 48A. Series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Sandoval County, New Mexico, l987.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon: The zone from 0 to 15 inches. (A1 and A2 horizons)
Argillic horizon: The zone from 28 to 60 inches. (Bt1 and Bt2 horizons)
Keys to Soil Taxonomy: Series classified according to Eighth Edition, 1998.