LOCATION LAZEAR CO+UT WYEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, calcareous, mesic Lithic Ustic Torriorthents
TYPICAL PEDON: Lazear gravelly loam in grassland. (Colors are for dry soil unless otherwise noted.)
A--0 to 4 inches; light brownish gray (10YR 6/2) gravelly loam, dark grayish brown (10YR 4/2) moist; moderate fine granular structure; soft, very friable; 15 percent sandstone gravel; strongly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (2 to 5 inches thick)
C--4 to 14 inches; light brown (7.5YR 6/3) gravelly loam, brown (7.5YR 4/3) moist; massive; slightly hard, very friable; 20 percent sandstone gravel; strongly effervescent; moderately alkaline (pH 8.2); abrupt wavy boundary.
R--14 inches; hard calcareous sandstone bedrock.
TYPE LOCATION: Delta County, Colorado; SW 1/4 of the NW 1/4 of sec. 29, T. 4 S., R. 3 E.; Dominguez USGS quad; lat. 38 degrees 46 minutes 57 seconds N. and long. 108 degrees 17 minutes 0.1 seconds W., NAD27
RANGE IN CHARACTERISTICS:
Soil moisture regime: aridic bordering on ustic
Soil temperature regime: mesic
Mean annual soil temperature: 47 to 58 degrees F
Mean summer soil temperature: 60 to 78 degrees F
Particle-size control section: 18 to 35 percent clay
Depth to lithic contact: 10 to 20 inches to hard calcareous sedimentary rock
A horizon:
Hue: 7.5YR or 10YR
Value: 5 to 7 dry, 3 to 5 moist
Chroma: 2 to 4 dry or moist
Rock fragments: 0 to 35 percent
EC (mmhos/cm): 0 to 2
Reaction: slightly to strongly alkaline
C horizon:
Hue: 7.5YR to 2.5Y
Value: 5 to 8 dry, 4 to 6 moist
Chroma: 2 to 4 dry or moist
Texture: fine sandy loam, loam, clay loam, channery fine sandy loam, gravelly loam, channery loam
Rock fragments: 0 to 35 percent
Calcium carbonate equivalent: 1 to 15 percent
EC (mmhos/cm): 0 to 4
Reaction: slightly to strongly alkaline
COMPETING SERIES: These are the Bigmon, Hideout, Kenzo, Redspear, Rizno, Rizozo, Skyvillage, Travessilla, Travson, and Zukan series. Bigmon, Hideout, Rizno, Skyvillage, Travessilla, and Travson soils have less than 18 percent clay in the particle-size control section. Redspear, and Rizozo soils have hues of 5YR or redder. Kenzo soils have hues of 7.5YR or redder and have less than 18 percent clay in the particle-size control section. Zukan soils are over limestone bedrock and have a horizon of carbonate accumulation.
GEOGRAPHIC SETTING:
Parent material: colluvium, slope alluvium, residuum derived from interbedded shale, loamstone, sandstone and limestone
Landform: structural benches, ledges, hills, mesas, and ridges
Slopes: 0 to 65 percent
Elevation: 4,700 to 6,800 feet
Mean annual temperature: 45 to 56 degrees F
Mean annual precipitation: 9 to 13 inches
Frost-free period: 120 to 150 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Shavano soils and the competing Travessilla soils. Shavano soils have a lithic contact at depths greater than 20 inches and Travessilla soils contain less than 18 percent clay in the particle-size control section.
DRAINAGE AND PERMEABILITY: well drained, low to high runoff, moderate permeability
USE AND VEGETATION: These soils are used principally as native pastureland. Native vegetation is galleta grass, cactus, greasewood, and snakeweed.
DISTRIBUTION AND EXTENT: The foothill areas of western and southwest Colorado and adjacent parts of Wyoming; central Utah. LRR D, MLRA 34B and 35. This series is extensive.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Delta County, (Paonia Area) Colorado. 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 4 inches. (A horizon)
Lithic contact: The zone at 14 inches. (R horizon)
Secondary carbonates usually coat the surface of the bedrock.
Particle-size control section: The zone from 0 to 14 inches. (A and C horizons)
Last updated by the state: 3/04.
Soil Taxonomy Second Edition, 1999