LOCATION TUCKERVILLE COEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Ustic Glossocryalfs
TYPICAL PEDON: Tuckerville very stony sandy loam, on a southwest facing, simple, 35 percent slope in spruce-fir woodland at an elevation of 9,600 feet. (Colors are for dry soil unless otherwise noted.) Described on August 15, 1990.
0i--0 to 3 inches, slightly decomposed needles, leaves, bark, and twigs. (0 to 3 inches thick)
A--3 to 6 inches; brown (7.5YR 5/2) very stony sandy loam, brown (7.5YR 4/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; 10 percent gravel, 15 percent cobble, 20 percent stones; neutral (pH 6.8); clear smooth boundary. (0 to 4 inches thick)
E--6 to 21 inches; pinkish gray (7.5YR 7/2) very stony sandy loam, brown (7.5YR 5/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; 10 percent gravel, 15 percent cobble, 20 percent stones; neutral (pH 6.6); clear smooth boundary. (4 to 18 inches thick)
E/B--21 to 26 inches; (60 percent E) pinkish gray (7.5YR 7/2) very stony sandy loam, brown (7.5YR 5/3) moist, and (40 percent Bt), reddish brown (5YR 5/3) very stony sandy clay loam. reddish brown (5YR 4/3) moist; weak medium subangular blocky structure parting to moderate medium granular; slightly hard, friable, slightly sticky and slightly plastic; common distinct clay films on faces of peds of the B part. The horizon consists of clayey material like that of the underlying horizon embedded in a matrix like that of the overlying horizon. 10 percent gravel, 20 percent cobble, 15 percent stones; neutral (pH 6.6); clear smooth boundary. (4 to 12 inches thick)
Bt--26 to 47 inches; reddish brown (5YR 5/4) very stony sandy clay loam, reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure; hard, friable, sticky and plastic; many distinct clay films on faces of peds; 10 percent gravel, 10 percent cobble, 20 percent stones; slightly acid (pH 6.4); gradual wavy boundary. (10 to 30 inches thick)
C--47 to 63 inches; light reddish brown (5YR 6/4) extremely stony sandy loam, reddish brown (5YR 5/4) moist; massive; hard, very friable, slightly sticky and slightly plastic; 15 percent gravel, 25 percent cobble, 35 percent stones; neutral (pH 6.6).
TYPE LOCATION: La Plata County, Colorado; about 15 miles north of Bayfield, Colorado; located about 500 feet south and 200 feet east of the northwest corner of Sec. 33, T. 37 N., R. 7 W.; Lemon Reservoir USGS quad; lat. 37 degrees, 26 minutes, 08 seconds N. and long. 107 degrees, 39 minutes, 00 seconds W., NAD 27
RANGE IN CHARACTERISTICS: (depths given are measured from the mineral soil surface)
Soil moisture regime: udic; dry in some part of the moisture control section for 45 to 90 cumulative days (ustic udic subclass).
Mean annual soil temperature: 38 to 42 degrees F.
Mean summer soil temperature: 45 to 47 degrees F. with an O horizon.
Base saturation: 60 to 80 percent (estimated)
Mica content: 0 to 15 percent (by grain count)
Lithology of rock fragments: mostly granitic and sandstone
Particle-size control section:
Clay content: 20 to 35 percent
Rock fragment content: 35 to 80 percent, mainly gravel, cobble and stones.
A horizon:
Hue: 5YR or 7.5YR
Value: 4 or 5 dry, 2 to 4 moist
Chroma: 1 to 3, dry and moist
Texture, fine earth fraction: L, SL
Rock fragment content: 5 to 65 percent
Reaction: slightly acid or neutral
E horizon:
Hue: 5YR or 7.5YR
Value: 6 to 8 dry, 4 to 7 moist
Chroma: 1 to 3, dry and moist
Texture, fine earth fraction: L, SL
Rock fragment content: 15 to 65 percent
Reaction: slightly acid or neutral
E/B
E part
Hue: 5YR or 7.5YR
Value: 5 to 8 dry, 4 to 7 moist
Chroma: 1 to 3, dry and moist
Texture, fine earth fraction: SL, L
Bt part
Hue: 2.5YR or 5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 to 6, dry and moist
Texture, fine earth fraction: CL, SCL, L
Rock fragment content: 35 to 80 percent
Reaction: moderately acid to neutral
Bt horizon:
Hue: 2.5YR or 5YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 2 to 6, dry and moist
Texture, fine earth fraction: L, CL, SCL
Rock fragment content: 35 to 80 percent
Reaction: moderately acid to neutral
C horizon:
Hue: 2.5YR to 5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry and moist
Texture, fine earth fraction: SCL, SL
Rock fragment content: 35 to 80 percent
Reaction: slightly acid or neutral
COMPETING SERIES: These are the
Gambler,
Granile,
Kebler,
Kurrie,
Larand, and
Leadville series.
Gambler, Kebler, Kurrie soils: have a lithic contact within 60 inches.
Granile soils: have greater than 15 percent mica
Larand soils: have a lithologic discontinuity with sandy outwash
Leadville soils: are close competitors, but are believed to be drier in the moisture control section, and possible colder (conducive to supporting lodgepole pine, and not white fir). In addition, base saturation may be below 60 percent in the upper part.
GEOGRAPHIC SETTING:
Parent material: Slope alluvium and colluvium derived from granite, gneiss, schist, and sandstone.
Landform: Mountain slopes.
Slopes: 10 to 60 percent
Elevation: 8,500 to 10,000 feet
Mean annual air temperature: 36 to 42 degrees F.
Mean annual precipitation: 25 to 35 inches.
Wettest months: July and August receive the most precipitation.
Driest months: May and June receive the least precipitation, though the soils are still wet from snowmelt and are typically covered with snow in many places into June.
Frost-free period: 60 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Sponsor and Weminuche soils. Both are on mountain slopes and have less than 35 percent rock fragments in the particle size control section.
DRAINAGE AND PERMEABILITY: Well drained; medium to high runoff; moderate permeability.
USE AND VEGETATION: These soils are used for timber production, livestock grazing, wildlife habitat, and recreation. Typical native vegetation is Englemann's spruce, subalpine fir, white fir, Rocky Mountain Douglas fir, quaking aspen, fescue, mountain brome, spike tricetum, snowberry, and serviceberry (white fir-Rocky Mountain Douglas fir/mountain snowberry plant association).
DISTRIBUTION AND EXTENT: Southwestern Colorado. LRR E, MLRA 48A. This series is of moderate extent. The name is taken from an old mining community in the vicinity.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: La Plata County, Colorado, Animas-Dolores soil survey area, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 3 to 6 inches. (A horizon)
Albic horizon: The zone from 6 to 21 inches. (E horizon)
Glossic horizon: The zone from 21 to 26 inches. (E/B horizon)
Argillic horizon: The zone from 26 to 47 inches. (Bt horizon)
Particle size control section: The zone from 26 to 46 inches. (part of the Bt horizon)
Keys to Soil Taxonomy: Classified according to the Eighth Edition, 1998
The activity class is presumed based on a general trend of other soils in the area.