LOCATION LEADVILLE COEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Ustic Glossocryalfs
TYPICAL PEDON: Leadville stony loam - forest. (Colors are for dry soil unless otherwise noted.)
0i--0 to 3 inches; slightly decomposed needles, bark, twigs, and grass remains. (1 to 2 inches thick)
0e--3 to 4 inches; partially decomposed organic material derived from the materials overlying this horizon. (Combined thickness of the Oi and Oe horizons is 2 to 4 inches)
A--4 to 5 inches; dark grayish brown (10YR 4/2) loam, very dark brown (10YR 2/2) moist; strong fine granular and crumb structure; soft, very friable, slightly sticky and slightly plastic; 10 percent stones; moderately acid; gradual wavy boundary. (0 to 4 inches thick)
E--5 to 12 inches; pink (7.5YR 7/3) loam, brown (7.5YR 5/3) moist; moderate thin platy structure parting to medium granular; soft, very friable, slightly sticky and slightly plastic; 10 percent stones; moderately acid; gradual wavy boundary. (4 to 14 inches thick)
B/E--12 to 18 inches; mixed reddish brown (5YR 5/4) and pink (7.5YR 7/3) very stony clay loam (composite texture), reddish brown (5YR 4/4) and brown (7.5YR 5/3) moist; weak medium subangular blocky structure parting to fine granular; slightly hard, very friable, slightly sticky and slightly plastic; hard, friable, slightly sticky and slightly plastic; few glossy patches on some peds, and in some root channels and pores; the horizon consists of clayey material like that of the underlying horizon embedded in a matrix like that of the overlying horizon; 40 percent stones; slightly acid; gradual wavy boundary. (4 to 12 inches thick)
Bt1--18 to 34 inches; reddish brown (5YR 5/4) extremely stony clay loam, reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure; extremely hard, very firm, slightly sticky and moderately plastic; common continuous clay films on faces of peds and as coatings in root channels and pores; 70 percent stones; slightly acid; gradual wavy boundary. (10 to 25 inches thick)
Bt2--34 to 44 inches; reddish brown (5YR 5/4) extremely stony clay loam, reddish brown (5YR 4/4) moist; weak medium subangular blocky structure; very hard, very firm, slightly sticky and slightly plastic; glossy patches on some peds and in some root channels and pores; 60 percent stones; slightly acid; gradual wavy boundary. (4 to 12 inches thick)
C--44 to 64 inches; reddish brown (5YR 5/4) extremely stony loam, reddish brown (5YR 4/4) moist; massive; hard, very friable, slightly sticky and slightly plastic; 70 percent stones; neutral.
TYPE LOCATION: Lake County, Colorado; about 1 mile south of Leadville, 1.2 miles east of Highway 24 along county road #6 in the SW 1/4 Sec. 25, T. 9 S., R. 80 W. Leadville South USGS quad; approximate lat. 39 degrees 13 minutes 58 seconds N. and long. 106 degrees 17 minutes 19 seconds W., NAD 83
RANGE IN CHARACTERISTICS:
Depths are from the mineral surface.
Moisture regime: udic bordering on ustic.
Mean annual soil temperature: 38 to 44 degrees F.
The mean summer soil temperature ranges from 51 to 56 degrees F.
Depth to the top of the argillic horizon: 10 to 24 inches
Rock fragments range from 35 to 80 percent in the 10- to 40-inch section and are mainly 3 to 48 inches in diameter.
A horizon: (if present)
Hue: 10YR to 5YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 1 to 3.
E horizon:
Hue: 10YR to 5YR
Value: 5 to 8 dry, 4 to 7 moist
Chroma: 1 to 4
Bt horizon:
Hue: 5YR to 10R
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 1 to 6
Texture of the fine earth fraction: loam, clay loam, or sandy clay loam
Clay content: 18 to 35 percent
Rock fragment content: 35 to 80 percent
Reaction: strongly acid to neutral
C horizon: (when present)
Hue: 5YR to 10R
Texture of the fine earth fraction: loam, clay loam, or sandy clay loam.
Reaction: strongly acid to neutral
COMPETING SERIES: These are the
Gambler,
Granile,
Kebler,
Kurrie,
Larand,
MacFarlane, and
Tuckerville series.
Gambler soils: have a lithic contact at depths of 20 to 40 inches.
Kebler soils: have a lithic contact at depths of 20 to 40 inches.
Granile soils: have hues of 7.5YR or yellower in the Bt horizon.
Kurrie soils: have a lithic contact at depths of 40 to 60 inches.
Larand soils: have a sandy-skeletal substratum.
MacFarlane soils have hue yellower than 5YR in the Bt horizon and less than 18 percent clay in the fine-earth fraction on the Bt.
Tuckerville soils: are close competitors, but are believed to be more moist in the moisture control section and possibly warmer; Tuckerville soils support white fir in the plant community.
GEOGRAPHIC SETTING:
Parent material: colluvium, alluvium, and glacial debris from gneiss, schist, and sedimentary rocks.
Landform: mountain sides, alluvial fans, and terraces.
Slopes: 2 to 50 or more percent.
Mean annual precipitation is 18 to 26 inches.
Wettest periods: in the spring and summer.
Mean annual temperature: 36 to 42 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Troutville soils and the competing Kebler soils. Troutville soils lack a continuous argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; medium to high runoff; moderate permeability.
USE AND VEGETATION: These soils are used as native pastureland, for forestry, and for recreation. Typical native vegetation is lodgepole pine, Engelmann's spruce, and subalpine fir.
DISTRIBUTION AND EXTENT: Central and southern Colorado; LRR E, MLRA 48A. Moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Lake County, Colorado, 1974.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: the zone from 12 to 32 inches. (B/E and part of the Bt1 horizons)
Albic horizon: the zone from 5 to 12 inches (E horizon).
Glossic horizon: the zone from 12 to 18 inches. (B/E horizon).
Argillic horizon: the zone from 12 to 44 inches. (B/E and part of Bt1 horizons).
4/2001 the precipitation range was narrowed to less than 26 inches to limit this series to ustic-udic moisture regime.
Taxonomic Version: Tenth Edition, 2006.