LOCATION WOODHALL CO+MTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Ustic Argicryolls
TYPICAL PEDON: Woodhall stony loam - mixed grass and timber. (Colors are for dry soil unless otherwise noted.)
A--0 to 5 inches; dark grayish brown (10YR 4/2) stony loam, very dark brown (10YR 2/2) moist; strong fine granular and crumb structure; soft, very friable, slightly plastic; 20 percent stones; neutral; clear smooth boundary. (0 to 8 inches thick)
BA--5 to 9 inches; brown (10YR 5/3) very stony loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure parting to strong fine granular; hard, friable, slightly plastic; few faint clay films on faces of peds and in some root channels; 40 percent stones neutral; gradual smooth boundary. (0 to 6 inches thick)
Bt--9 to 20 inches; brown (10YR 5/3) very stony clay loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; very hard, friable, sticky and plastic; many distinct clay films on faces of peds, in root channels, and on surfaces of many rock fragments; 50 percent stones; neutral; gradual smooth boundary. (6 to 30 inches thick)
BC--20 to 24 inches; brown (10YR 5/3) extremely stony loam, brown (10YR 4/3) moist; weak fine subangular blocky structure; very hard, friable, slightly plastic; 60 percent stones; neutral; gradual wavy boundary. (0 to 6 inches thick)
R--24 inches; rhyolite.
TYPE LOCATION: Gunnison County, Colorado; near the center of Sec. 1, T. 46 N., R. 3 W.
RANGE IN CHARACTERISTICS:
Soil moisture regime: ustic-udic
Mean annual soil temperature: 34 to 44 degrees F (1.1 to degrees C)
Mean summer soil temperature: 42 to 52 degrees F (5.6 to 11.1 degrees C)
Depth to bedrock (lithic): 20 to 40 inches (51 to 102 centimeters)
Depth to top of argillic: less than 24 inches (61 centimeters)
Depth to base of argillic: 15 to 40 inches (38 to 102 centimeters)
Thickness of mollic epipedon: 4 to 15 inches (10 to 38 centimeters)
Thickness of argillic: 19 to 23 inches (48 to 58 centimeters)
Rock fragments: 35 to 75 percent by volume in the solum and C horizon and are
greater than 10 inches (25 centimeters) in diameter.
Reaction of solum: slightly acid to slightly alkaline
A horizon:
Hue: 5Y through 7.5YR
Value: 3 through 5 dry, 2 or 3 moist
Chroma: 1 through 3
Rock fragments: less than 35 percent (in some pedons)
Bt horizon:
Hue: 5Y through 7.5YR
Value: 4 through 6 dry, 2 through 5 moist
Chroma: 2 through 5
Texture: very stony clay loam, extremely gravelly sandy clay loam, very gravelly sandy clay loam, or very channery loam
Clay: 18 to 34 percent
Sand: 20 to 70 percent with more than 15 percent fine or coarser sand
Silt: 5 to 65 percent
Rock fragments: 35 to 75 percent
C horizon:
Hue: 5Y through 7.5YR
Value: 4 to 6 dry; 3 to 5 moist
Chroma: 2 or 3
Texture: extremely stony loam, extremely channery fine sandy loam, very gravelly sandy loam, extremely gravelly sandy loam, very channery fine sandy loam and very cobbly fine sandy loam
Clay content: 5 to 18 percent
Sand content: 30 to 60 percent
Silt content: 30 to 65 percent
Rock fragments: 35 to 75 percent
COMPETING SERIES: These are the
Blaine (MT),
Bowen (CO),
Fingerrock (CO),
Fornor (WY),
Fourmile (CO),
Geertsen (UT),
Hoodle (UT),
Hungryhill (MT), Lagrita (CO),
Lambe (CO),
Libeg (MT),
Nathale (WY),
Nathrop (CO),
Norriston (CO),
Quander (CO),
Ratiopeak (MT), and
Spanpeak (MT) series.
Blaine, Nathale and Nathrop soils have calcic horizons.
Bowen soils have rock fragments that are mainly less than 10 inches (25 centimeters) in diameter.
Fingerrock soils are very deep.
Fornor soils are very deep.
Fourmile soils are very deep.
Geertsen soils are deep.
Hoodle soils are very deep.
Lambe soils are very deep.
Libeg soils are very deep.
Norriston soils are very deep.
Quander soils are very deep.
Hungryhill has ustic moisture regime.
Lagrita soils are very deep and have calcic horizons.
Ratiopeak soils are very deep.
Spanpeak soils are very deep.
GEOGRAPHIC SETTING:
Parent material: formed in noncalcareous gravelly colluvium and or slope alluvium derived from igneous and sedimentary rock.
Landform: upland hills, ridges, u-shaped valleys, mesa and mountain side slopes
Slopes: 3 to 65 percent
Elevation: 8,200 to 11,500 feet (2,499 to 3,505 meters); at the type location is about 8,840 feet (2,694 meters)
Mean annual air temperature: 32 to 44 degrees F (0.0 to 6.7 degrees C)
Mean annual precipitation: 16 to 34 inches (41 to 86 centimeters)
Precipitation pattern: The soil moisture control section is affected by snow melt in early spring and peak precipitation in the form of thunderstorms occurring from June to September
Frost free period: 40 to 75 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ruby and Vulcan soils. Ruby soils are deep, have fewer coarse fragments in the solum and overlie fragmental substratums. Vulcan soils not have a mollic epipedon and have an argillic horizon overlying fragmental materials.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: The soils are used as native pastureland, for recreation, and for limited forest purposes. Native vegetation is sagebrush, buckbrush, native bluegrass, shrubs, and open timber stands.
DISTRIBUTION AND EXTENT: Mountain areas of Colorado; LLR E, MLRA 48A. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Gunnison County, Colorado, 1971.
REMARKS:
Diagnostic features include:
Mollic epipedon: 0 to 9 inches (0 to 23 centimeters) (A, BA horizons)
Argillic horizon: 9 to 20 inches (23 to 51 centimeters) (Bt horizon).
Lithic contact at 24 inches (61 centimeters) (R horizon).
Last updated by the state 2/99.
The soils are normally noncalcareous throughout and do not have continuous subhorizons of visible secondary carbonate, but are weakly and inconsistently calcareous and have some inconsistent accumulation of secondary carbonate below the solum in some pedons.
Taxonomic version: Tenth Edition, 2006.