LOCATION GLENDO WYEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, mesic Aridic Haplustepts
TYPICAL PEDON: Glendo silt loam -- on a south-southeast facing slope of 2 percent, utilized as irrigated pasture. (Colors are for dry soil unless otherwise stated.)
A-- 0 to 3 inches; very pale brown (10YR 7/3) silt loam, yellowish brown (10YR 5/4) moist; weak coarse platy structure parting to weak very fine and fine platy; soft, very friable, slightly sticky and slightly plastic; many very fine and common fine roots; common very fine and few fine continuous irregularly shaped pores; strongly effervescent; calcium carbonate disseminated; moderately alkaline (pH 8.2); abrupt smooth boundary. (3 to 7 inches thick)
Bw1-- 3 to 8 inches; very pale brown (10YR 7/3) silt loam, yellowish brown (10YR 5/4) moist; weak coarse prismatic structure parting to weak moderate and coarse subangular blocky; hard, very friable, slightly sticky and slightly plastic; many very fine and common fine roots; common very fine and few fine continuous irregularly shaped pores; strongly effervescent; calcium carbonate disseminated; moderately alkaline (pH 8.2); clear smooth boundary.
Bw2-- 8 to 14 inches; yellowish brown (10YR 5/4) silt loam, dark brown (10YR 3/3) moist; weak coarse prismatic structure parting to weak moderate and coarse subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and common fine roots; common very fine and few fine continuous irregularly shaped pores; strongly effervescent, calcium carbonate disseminated; moderately alkaline (pH 8.2); clear wavy boundary. (Combined thickness of the Bw horizon is 10 to 20 inches)
C1-- 14 to 27 inches; very pale brown (10YR 7/3) silt loam, yellowish brown (10YR 5/4) moist; massive; hard, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine and few fine continuous irregularly shaped pores; violently effervescent,
calcium carbonate disseminated; 10 percent siltstone gravel; strongly alkaline (pH 8.7); gradual wavy boundary.
C2-- 27 to 60 inches; very pale brown (10YR 7/3) loam, yellowish brown (10YR 5/4) moist; massive; very hard, very friable, slightly sticky and slightly plastic; few very fine and fine continuous irregularly shaped pores; violently effervescent, calcium carbonate disseminated; strongly alkaline (pH 8.7); gradual wavy boundary.
TYPE LOCATION: Platte County, Wyoming; about 20 feet south and 1850 feet east of the northwest corner of Section 19, T. 29 N, R. 68 W. Sibley Peak Quadrangle. 42 degrees 28 minutes 37 seconds north latitude and 105 degrees 3 minutes 37 seconds west longitude.
RANGE IN CHARACTERISTICS: Glendo soils are typically effervescent throughout but may be leached as deep as 10 inches in some pedons. Rock fragments range from 0 to 10 percent throughout. The particle size control section averages 70 to 85 percent silt, 5 to 18 percent clay, and 5 to 15 percent fine and coarser sand. The moisture control section is usually dry. It is usually moist in April May and early June and dry for 60 days or more during the 90 day period following the summer solstice. The mean annual soil temperature is 47 to 51 degrees F.
The A horizon has value of 5 through 7 dry and 3 through 5 moist and chroma of 2 through 4. Texture is very fine sandy loam or silt loam. It is slightly alkaline or moderately alkaline.
The Bw horizon has value of 5 through 7 dry and 3 through 5 moist and chroma of 2 through 4. Texture is very fine sandy loam, loam or silt loam. Some pedons have a Bk horizon with the same basic properties as the Bw horizon. it is moderately alkaline or strongly alkaline.
The C horizon has hue of 2.5Y or 10Yr, value of 5 through 7 dry, and chroma of 2 through 4. Texture is very fine sandy loam, loam or silt loam. The reaction is moderately alkaline or strongly alkaline.
COMPETING SERIES: These are the Angora and Hidvalle series. The Angora soils formed in loess on ridges and interfluves. Hidvalle soils are intermittently moist in July through September, and driest in May and June.
GEOGRAPHIC SETTING: Glendo soils are on alluvial fans, terraces, and hills. They formed in alluvium derived from siltstone and fine grained sandstone. Slopes are 0 to 6 percent. Elevations are 4300 to 6700 feet. The average annual precipitation is 12 to 15 inches. The average annual air temperature is 46 to 48 degrees F. The frost-free season is 110 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Anvil, Clarkelen, Mitchell and Norka soils. Anvil soils have a stratified sandy-skeletal control section. Clarkelen soils have a stratified coarse-loamy control section. Mitchell soils lack a cambic horizon. Norka soils have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Well drained; low to medium runoff; moderate permeability.
USE AND VEGETATION: These soils are utilized for wildlife habitat, grazing by domestic livestock and irrigated hayland and pasture. The native vegetation is mainly western wheatgrass, green needlegrass, blue grama, and sagebrush. The principle irrigated crop is alfalfa.
DISTRIBUTION AND EXTENT: Glendo soils occur in eastern Wyoming. The series is of limited extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES PROPOSED: Platte County, Wyoming; 1987.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 3 inches (A)
Cambic horizon - 3 to 14 inches (Bw1, Bw2)
SIR- WY1010
MLRR- G