LOCATION BRUMLEY COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Calcidic Haplustalfs
TYPICAL PEDON: Brumley loam, on an east facing, simple 3 percent slope in pinyon-juniper woodland, at an elevation of 7,040 feet. (Colors are for dry soil unless otherwise noted.) Described on October 3, 1984.
A--0 to 2 inches; brown (10YR 5/3) loam, dark brown (7.5YR 3/2) moist; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots; few very fine pores; slightly alkaline (pH 7.4); clear smooth boundary. (2 to 6 inches thick)
Bt--2 to 17 inches; brown (7.5YR 4/4) clay loam, dark brown (7.5YR 3/4) moist; moderate medium subangular blocky structure parting to strong fine subangular blocky; hard, friable, moderately sticky and moderately plastic; common very fine and fine, and few medium roots; common fine, and few medium pores; common distinct clay films on faces of peds; slightly alkaline (pH 7.4); clear smooth boundary. (12 to 25 inches thick)
Btk--17 to 25 inches; light brown (7.5YR 6/4) clay loam, brown (7.5YR 5/4) moist; moderate fine subangular blocky structure; very hard, friable, moderately sticky and moderately plastic; common very fine and fine roots; few medium tubular pores; common distinct clay films on faces of peds; slightly effervescent with calcium carbonate disseminated; moderately alkaline (pH 8.0); gradual smooth boundary. (3 to 11 inches thick)
Bk1--25 to 40 inches; light brown (7.5YR 6/4) clay loam, brown (7.5YR 5/4) moist; weak medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and fine roots; common very fine and fine pores; violently effervescent; calcium carbonate disseminated and in small masses; 28 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); clear smooth boundary. (10 to 20 inches thick)
Bk2--40 to 60 inches; pink (7.5YR 7/4) loam, brown (7.5YR 5/4) moist; massive; hard, very friable, moderately sticky and slightly plastic; violently effervescent; calcium carbonate disseminated and in small masses and seams; 37 percent calcium carbonate equivalent, decreasing with depth; moderately alkaline (pH 8.0).
TYPE LOCATION: Dolores County, Colorado; about 30 miles north of Dolores; located about 700 feet east and 2,300 feet south of the northwest corner of sec. 2, T. 41 N., R. 16 W. Glade Mountain USGS quad.; Lat. 37 degrees, 50 minutes, 44 seconds north; Long. 107 degrees, 36 minutes, 34 seconds north. NAD 27
RANGE IN CHARACTERISTICS:
Soil moisture regime: ustic bordering on aridic, the moisture control section is dry in June.
Mean annual soil temperature: 48 to 54 degrees F
Depth to the base of the argillic horizon: 17 to 39 inches
Depth to calcic horizon: 17 to 39 inches
Depth to secondary calcium carbonate: 14 to 27 inches
Particle-size control section:
Clay content: 27 to 35 percent
Rock fragment content: 0 to 15 percent
A horizon:
Hue: 7.5YR or 10YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 2 or 3, dry and moist
Rock fragments: 0 to 15 percent sandstone gravel and cobble
Reaction: neutral or slightly alkaline
Bt horizon:
Hue: 5YR or 7.5YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 3 to 6 dry or moist
Texture: sandy clay loam or clay loam
Rock fragment content: 0 to 15 percent sandstone gravel and cobble
Btk horizon:
Hue: 5YR or 7.5YR
Value: 5 or 6 dry, 4 to 5 moist
Chroma: 3 to 6 dry or moist
Texture: sandy clay loam or clay loam
Rock fragment content: 0 to 15 percent sandstone gravel and cobble
Calcium carbonate equivalent: 1 to 5 percent
Reaction: slightly alkaline or moderately alkaline
Bk horizon:
Hue: 5YR or 7.5YR
Value: 6 to 8 dry, 5 to 7 moist
Chroma: 3 to 6 dry and moist
Texture: sandy clay loam, loam, clay loam
Rock fragment content: 0 to 15 percent sandstone gravel and cobbles
Calcium carbonate equivalent: 15 to 50 percent that decreases with depth from the maximum concentration.
COMPETING SERIES: This is the
Alire,
Banquito,
Nomrah, and
Todest series.
Soils that are presently classified as Aridic Haplustalfs that have a calcic horizon starting within 40 inches are the
Goesling and
Maia series.
Alire: Has volcanic glass in the profile.
Banquito and
Todest soils are moderately deep to a lithic contact.
Goesling and
Nomrah soils are dry in the moisture control section for longer periods (in
May and June). In addition, Nomrah soils have the base of the argillic horizon between 40 and 60 inches.
Maia soils have 15 to 30 percent rock fragments within 40 inches of the surface.
GEOGRAPHIC SETTING:
Parent material: slope alluvium derived dominantly from sandstone.
Landform: terraces and mesas.
Slopes: 1 to 12 percent
Elevation: 6,800 to 7,200 feet
Mean annual temperature: 46 to 52 degrees F.
Mean annual precipitation: 12 to 15 inches.
Wettest Months: July and August.
Driest Months: May and June receive the least precipitation, however, the soils are still moist from snowmelt through May.
Frost-free period: 100 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Arabrab series. Arabrab soils are shallow to sandstone bedrock and are on sideslopes of drainageways.
DRAINAGE AND PERMEABILITY: well drained, low runoff, moderately slow permeability.
USE AND VEGETATION: These soils are used mainly for livestock grazing and wildlife habitat. The native vegetation is Indian ricegrass, western wheatgrass, Basin big sagebrush, Junegrass, muttongrass, needlegrass, pinyon and Juniper .
DISTRIBUTION AND EXTENT: Southwest Colorado. LRR D, MLRA 36. This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Dolores County, Animas-Dolores Area, Colorado 2002. Series proposed in 1997. The name is from a nearby peak.
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 25 inches. (Bt and Btk horizons)
Calcic horizon: The zone from 25 to 60 inches. (Bk1 and Bk2 horizons)
Particle-size control section: The zone from 2 to 22 inches. (Bt and part of the Btk horizons)
Keys to Soil Taxonomy: Classified according to the Eighth Edition, 1998
Activity class is presumed based on general trend of soils in the area.
ADDITIONAL DATA: Calcium carbonate equivalent determined by the field calcimeter.