LOCATION REDONDO NMEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Vitrandic Haplocryalfs
TYPICAL PEDON: Redondo coarse sandy loam--woodland. (Colors are for dry soil unless otherwise noted. Reactions are based on field-measured pH, not on NSSL data.)
A--0 to 2 inches; grayish brown (10YR 5/2) coarse sandy loam, very dark grayish brown (10YR 3/2) moist; weak medium granular structure; soft, very friable, slightly sticky, slightly plastic; many very fine and few medium roots; slightly acid (pH 6.4); clear smooth boundary. (0 to 4 inches thick)
E1--2 to 7 inches; light brownish gray (10YR 6/2) coarse sandy loam, dark grayish brown (10YR 4/2) moist, weak medium platy and weak fine subangular blocky structure; slightly hard, friable, slightly sticky, plastic; common very fine and few medium roots; few thin silt coatings on faces of peds; moderately acid (pH 6.0);; clear smooth boundary. (0 to 7 inches thick)
E2--7 to 15 inches; light gray (10YR 7/2) coarse sandy loam, brown (10YR 5/3) moist; weak medium platy and weak fine subangular blocky structure; slightly hard, friable, slightly sticky, plastic; common very fine and few medium roots; few thin silt films on faces of peds; 1 percent cobble, 2 percent gravel; moderately acid(pH 5.8);; clear wavy boundary. (6 to 11 inches thick)
BE--15 to 22 inches; pink (7.5YR 7/4) coarse sandy loam, brown (7.5YR 5/4) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; few fine and very fine roots; few thin silt films on faces of peds; 3 percent gravel; moderately acid(pH 5.8);; clear wavy boundary. (5 to 10 inches thick)
Bt--22 to 29 inches; light gray (10YR 7/2) gravelly coarse sandy loam, brown (10YR 5/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; few very fine roots; common moderately thick clay films on faces of peds; 25 percent gravel; moderately acid(pH 5.8);; gradual wavy boundary. (0 to 15 inches thick)
2Bt1--29 to 38 inches; light brown (7.5YR 6/4) very gravelly coarse sandy loam, brown (7.5YR 4/4) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, nonsticky, nonplastic; few fine medium and coarse roots; common moderately thick clay films bridging sand grains on rock fragments; 5 percent stones, 10 percent cobbles, 30 percent gravel; moderately acid(pH 5.8);; diffuse wavy boundary. (7 to 22 inches thick)
2Bt2--38 to 54 inches; light brown (7.5YR 6/4) extremely gravelly coarse sandy loamy brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; few fine and medium roots; common moderately thick clay films bridging sand grains and on rock fragments; 10 percent stones, 10 percent cobbles, 60 percent gravel; moderately acid(pH 5.8);; diffuse wavy boundary. (8 to 24 inches thick)
2Bt3--54 to 71 inches; light brown (7.5YR 6/4) extremely cobbly coarse sandy clay loam, brown (7.5YR 4/4) moist; massive; hard, firm, slightly sticky, slightly plastic; few medium roots; few moderately thick clay films bridging sand grains and on rock fragments; 15 percent stones, 25 percent cobbles, and 50 percent gravel; moderately acid(pH 5.8);diffuse wavy boundary. (7 to 20 inches thick)
2BC--71 to 87 inches; pink (7.5YR 7/4) extremely cobbly sandy clay loam, brown (7.5YR 5/4) moist; massive; hard, firm, slightly sticky, moderately plastic; 10 percent stones, 30 percent cobbles, 45 percent gravel; moderately acid (pH 5.8).
TYPE LOCATION: Sandoval County, New Mexico; about 14 miles west of Los Alamos; Baca Location, at upper end of canyon above movie set. It is the lower road near the top, 300 feet east of pond on south-facing slope, 40 feet north of road. New Mexico state plane coordinates N. 1,780,000 feet and E. 421,500 feet; 106 degrees, 31 minutes and 52 seconds west longitude, and 35 degrees, 52 minutes, and 45 seconds north latitude.
RANGE IN CHARACTERISTICS:
Soil Moisture: Moist in the soil moisture control section for 60 consecutive days or more within a 3-month period following the summer solstice.
Mean annual soil temperature: 37 to 45 degrees F.
Mean summer soil temperature: less than 52 degrees F.
Volcanic glass content: 20 to 30 percent in the coarse silt plus sand fraction
Oxalate extractable Al plus 1/2Fe: .05 to .30 percent (estimated)
Particle-size control section
Rock fragment content: 35 to 70 percent, dominantly gravel and cobbles.
A horizon
Hue: 7.5YR or 10YR
Value: 5 through 7 dry, 3 through 5 moist
Chroma: 2 or 3, dry or moist
Texture: coarse sandy loam, loam and gravelly sandy clay loam.
Reaction: moderately acid or slightly acid
E horizon
Hue: 7.5YR or 10YR
Value: 6 through 8 dry, 4 through 6 moist
Chroma: 1 through 4, dry or moist
Texture: coarse sandy loam, loam and gravelly sandy clay loam.
Reaction: strongly acid to slightly acid
B horizon
Hue: 7.5YR or 10YR
Value: 4 through 8 dry, 4 or 5 moist
Chroma: 2 through 4, dry or moist
Texture, fine earth fraction: coarse sandy loam through sandy clay loam
Clay content: averages less than 25 percent
Clay increase (absolute) from horizon above: at least 3 percent
Reaction: strongly acid or moderately acid
COMPETING SERIES: This is the Katyblay series. Katyblay soils have a xeric moisture regime.
GEOGRAPHIC SETTING: The Redondo soils are on mountains where elevations are 8,700 to 11,000 feet and slopes are 5 to 80 percent. They formed in medium textured materials derived from tuff. The mean annual precipitation is 25 to 30 inches, and the mean annual temperature is 38 to 44 degrees F. The frost-free period is about 45 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Calaveras and Origo series. Calaveras soils are frigid. Origo soils have an argillic made up of lamellae.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; medium runoff; moderately rapid permeability.
USE AND VEGETATION: These soils are mainly in forest. They are used for timber production, grazing, wildlife habitat, and recreation. Present vegetation is Douglas fir, Engelmann spruce, aspen, kinnikinnick, mountain brome, and sedges.
DISTRIBUTION AND EXTENT: High mountains of northcentral New Mexico. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Sandoval County, New Mexico, 1987.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 15 inches. (A and E horizons)
Argillic horizon: The zone from 22 to 68 inches. (Bt horizons)
Vitrandic feature: throughout the pedon, based on measured glass content and estimated oxalate extractable Al and Fe.
Particle-size control section: from 22 to 42 inches (Bt, 2Bt1, and part of the 2Bt2 horizon)
The 3/2002 revision changes the subgroup from Eutric to Vitrandic. This is based on NSSL glass count data and estimated oxalate Al and Fe. Glass counts are high enough for Vitrandic, but not high enough for ashy-skeletal and glassy family classes. Additional sampling may show these classes to be typical.
ADDITIONAL DATA: NSSL No. S78NM-043-5.