LOCATION LAS ANIMAS CO+KS NE OK UT WYEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, calcareous, mesic Typic Fluvaquents
TYPICAL PEDON: Las Animas sandy loam, grassland. (Colors are for dry soil unless otherwise noted.)
A--0 to 6 inches; gray (N 5/0) sandy loam, dark gray (N 4/0) moist; moderate fine granular structure; soft, very friable; strongly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (3 to 8 inches thick)
ACg--6 to 10 inches; light brownish gray (2.5Y 6/2) sandy loam stratified with loamy sand and loam, grayish brown (2.5Y 5/2) moist; common medium prominent yellowish brown (10YR 5/4) mottles; weak coarse subangular blocky structure parting to weak fine granular; slightly hard, very friable; strongly effervescent; moderately alkaline (pH 8.2); gradual smooth boundary. (0 to 8 inches thick)
Ckyg--10 to 60 inches; light brownish gray (2.5Y 6/2) sandy loam stratified with loamy sand and loam; grayish brown (2.5Y 5/2) moist; many coarse prominent light olive brown (2.5Y 5/6) moist and gray (N 5/) moist mottles; massive; soft, very friable; accumulation of visible secondary carbonate and sulfate in the form of crystals and concretions; strongly effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Bent County, Colorado; 2640 feet south of the NW corner of Sec. 6, T. 23 S., R. 51 W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 49 to 55 degrees F
Mean summer soil temperature: 70 to 75 degrees F
Depth to visible secondary calcium carbonate: 3 to 18 inches
Depth to endosaturation: 0 to 3.5 feet
Electrical Conductivity: ranges from 2 to more than 15 mmhos/cm but typically ranges from 4 to 16
Gypsum content: 0 to 5 percent
Continuous subhorizons with visible salt accumulation may occur at any depth.
Particle-size control section (weighted average):
Clay content: 8 to 18 percent
Sand content: 25 to 70 percent, with more than 15 percent fine and coarser sand
Rock fragment content: 0 to 15 percent
A horizon:
Hue: 5Y through 7.5YR
Value: 4 to 6 dry, 3 or 4 moist
Chroma: 0 through 2
Texture: loam, fine sandy loam
Reaction: moderately alkaline
C horizon:
Hue: 5Y to 7.5YR
Value: 3 to 7, 5 or 6 moist
Chroma: 1 to 3
Texture: fine sandy loam or sandy loam with strata of fine sand, sand, silt loam, loam, loamy sand, or loamy fine sand
Clay content: 8 to 18 percent, but may range to 3 percent below a depth of 40 inches
Calcium carbonate equivalent: 1 to 10 percent
Reaction: moderately alkaline to strongly alkaline
COMPETING SERIES:
This is the
Shoshone (WY) series.
Shoshone soils: have a lithologic discontinuity containing gravel and cobbles at depths within 25 to 40 inches of the surface.
GEOGRAPHIC SETTING:
Parent material: derived from calcareous stratified alluvial materials from mixed sources
Landform: flood plains, drainageways, and low terraces
Slopes: 0 to 6 percent
Elevation: 3500 to 5900 feet
Mean annual temperature: 50 to 54 degrees F
Mean summer temperature: 70 to 76 degrees F
Mean annual precipitation: 12 to 18 inches
Precipitation pattern: peak periods of precipitation in the spring and early summer months
Frost-free period: 125 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
Glenberg: are well drained
Haverson: have a fine-loamy control section
Ralton: are moderately well drained and coarse-silty
DRAINAGE AND PERMEABILITY:
Drainage: poorly drained or somewhat poorly drained
Permeability: moderate or moderately rapid
Runoff: slow or ponded
Flooding: common to frequent
USE AND VEGETATION: Used as pastureland or as native hay meadows. Native vegetation is willow, cottonwood, and a variety of water tolerant grasses.
DISTRIBUTION AND EXTENT: Colorado, Oklahoma, Utah, and Wyoming, Nebraska and Kansas in MLRA's 67 and 69. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Arkansas Valley Area, Colorado, 1936.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Moisture regime: aquic
Ochric epipedon: from 0 to 6 inches (A horizon).
This series last updated by the state, 1/89.