LOCATION LAMPHIER COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Lamphier loam - native grassland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 10 inches; brown (7.5YR 5/2) loam, dark brown (7.5YR 3/2) weak, medium subangular blocky structure parting to strong fine granular; soft, very friable; slightly acid (pH 6.4); gradual smooth boundary. (8 to 14 inches thick)
A2--10 to 16 inches; brown (7.5YR 5/2) loam, dark brown (7.5YR 3/2) moist; moderate medium subangular blocky structure parting to moderate fine granular; soft, very friable; slightly acid (pH 6.4); clear smooth boundary. (4 to 12 inches thick)
Bt--16 to 31 inches; brown (7.5YR 5/3) clay loam, dark brown (7.5YR 3/3) moist; moderate medium subangular blocky structure parting to moderate fine subangular blocky; soft, very friable; few discontinuous clay films on vertical surfaces of peds; 5 percent gravel; slightly acid (pH 6.2); gradual smooth boundary. (10 to 20 inches thick)
C--31 to 60 inches; brown (7.5YR 5/3) loam, dark brown (7.5YR 4/3) moist; massive; slightly hard, very friable; 10 percent gravel and cobbles, some of which are weathered; slightly acid (pH 6.4).
TYPE LOCATION: Gunnison County, Colorado; on the east side of Cement Creek Trail; in the SW1/4 of Sec. 15, T. 13 S., R. 84 W.
RANGE IN CHARACTERISTICS:
The moisture control section is dry in some part less than half the time the soil temperature is above 41 degrees F. at 20 inches, ustic udic moisture regime.
Mean annual soil temperature: 35 to 42 degrees F.
Mean summer soil temperature: 47 to 59 degrees F.
Thickness of the mollic epipedon: 16 to 40 or more inches
Typically the soil is noncalcareous to depths of more than 60 inches.
Organic carbon of the mollic epipedon: .7 to 3 percent and decreases uniformly with increasing depth
Base saturation: 80 to 100 percent, exchangeable sodium and potassium remain constant or decrease slightly with depth.
Cambic horizons occur below the mollic epipedon in some pedons but are discontinuous and not considered definitive.
Particle-size control section:
Textures: loam or clay loam, and less commonly sandy clay loam.
Clay content: 18 to 35 percent
Rock fragments content: 0 to 15 percent, gravel through stones.
A horizon:
Hue: 5YR through 10YR
Value: 3 through 5 dry, 2 or 3 moist
Chroma: 1 through 3
Reaction: slightly acid or neutral
Bt horizon (an AC or Bw in some pedons):
Hue: 2.5YR through 7.5YR
Value: 4 or 5 dry
Chroma: 2 or 3
Reaction: slightly acid or neutral
C horizon:
Hue: 2.5YR through 7.5YR
Value: 5 or 6 dry
Chroma: 3 through 6
Reaction: slightly acid or neutral
COMPETING SERIES: These are the Adel (MT), Argee, Bullbasin (CO), Hackwood (NV), Lespate (CO), Ohbejoyful, Rhone (CO), Secondset (CO), (T)Taterheap (CO), and Winevada (CO) series. In addition, the Bullrey, Duff, Gallatin, Idmon, Karlan, Levittville, Mundos, Osmund, Pahvohroo, and Strickland series may be competitors when updated.
Adel,
Bullrey, Idmon, and Pahvohroo soils have hue redder than 7.5YR below the A horizon
Argee soils have a paralithic contact above 40 inches.
Bullbasin soils have a lithic contact above 60 inches.
Duff and
Hackwood soils have 15 to 35 percent coarse fragments in the particle size control section.
Gallatin soils are somewhat poorly drained and have low permeability.
Karlan,
Lespate,
Secondset,
Strickland, and
Winevada soils have a lithic contact at depths of 20 to 40 inches.
Leavittville,
Mundos, and Osmund soils have horizons of secondary carbonates.
Rhone soils have over 35 percent channery material at depths of 20 to 40 inches.
Taterheap soils have greater than 35 percent rock fragments below 40 inches.
GEOGRAPHIC SETTING: The Lamphier soils are on alluvial fans, valley side slopes, and alluvial drainageways in the mountainous areas. Slopes range from 1 to 65 percent. The soils formed in local alluvium derived primarily from reddish brown sedimentary rock and conglomerate. At the type location the average annual precipitation is 18 to 25 inches with generally uniform precipitation occurring throughout the year. The mean annual temperature is 33 to 40 degrees F, and the frost-free season is 50 to 85 days. Elevation ranges from 7,000 to 8,600 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Buck, Sawcreek, and Teoculli soils. Buck soils have bedrock at depths of 10 to 20 inches. Sawcreek soils have bedrock at depths of 20 to 40 inches. Teoculli soils have mollic epipedons less than 16 inches thick.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used for rangeland, and for recreational purposes. Native vegetation is mainly Thurber fescue, nodding brome, wheatgrass, and bluegrass. There are scattered stands of aspen.
DISTRIBUTION AND EXTENT: High mountainous areas of central and western Colorado. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Gunnison County, Colorado, 1975.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon (pachic feature): from 0 to 31 inches (A1, A2, and Bt horizons)
Particle-size control section: The zone from 10 to 40 inches (A2, Bt, and part of the C horizon)
The Bt horizon has minor amounts of illuvial clay and is not considered to have the required clay increase of an argillic horizon.
Keys to Soil Taxonomy: Series classified according to Eighth Edition, 1998.
ADDITIONAL DATA: