LOCATION ADILIS CO+WYEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed, frigid Ustic
Torriorthents
TYPICAL PEDON: Adilis gravelly sandy loam, grassland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 4 inches; grayish-brown (10YR 5/2) gravelly sandy loam, very dark brown (10YR 3/4) when moist; moderate, fine, granular structure; soft, very friable; 15 percent gravel; neutral; clear, smooth boundary. 3 to 6 inches thick.
C1--4 to 20 inches; brown (10YR 5/3) gravelly sandy loam, brown (10YR 4/3) when moist; massive; slightly hard, very friable; 25 percent gravel; neutral; clear, smooth boundary. 7 to 18 inches thick.
IIC2--20 to 60 inches; pale brown (10YR 6/3) very gravelly sand, brown (10YR 5/3) when moist; single grained; loose; 60 percent gravel; noncalcareous; mildly alkaline.
TYPE LOCATION: Chaffee County, Colorado; 150 feet west and 40 feet north of the SE corner of Sec. 10, T. 50 N., R. 8 E.
RANGE IN CHARACTERISTICS: The Adilis soils typically are noncalcareous to depths of more than 60 inches but depth to uniformly calcareous material ranges from 40 to more than 60 inches. Depth to the very gravelly sandy IIC horizon ranges from 12 to 24 inches. The upper part of the control section is usually gravelly sandy loam, but ranges from 5 to 18 percent clay, 5 to 40 percent silt, and 42 to 80 percent sand with more than 35 percent being fine or coarser sand. Loamy fine sand or coarser textures are excluded from the above range. Rock fragments in this layer range from 0 to 35 percent by volume and range in diameter from 1/4 to 10 inches but are typically less than 3 inches in diameter. The lower part of the control section is gravelly or very gravelly loamy sand or sand. The A and C horizons range from slightly acid to mildly alkaline. Mean annual soil temperature is 46 degrees F, and the mean summer soil temperature is 63 degrees F.
The A horizon has hue of 2.5Y through 7.5YR, value of 5 through 7 dry, 3 through 6 moist, and chroma of 1 through 4.
The C horizon has hue of 2.5Y through 7.5YR.
COMPETING SERIES: These are the Baculan and Dominson series. Baculan soils have mean annual soil temperature warmer than 47 degrees F. Dominson soils have a mollic epipedon.
GEOGRAPHIC SETTING: The Adilis soils are on high terraces or gently sloping alluvial fans in mountain valleys. Slope gradients range from 0 to about 8 percent. The soils formed in polylithologic alluvial sediments derived from mixed sources and characterized by a moderately coarse textured upper part of the control section and a coarse textured lower part. At the type location the average annual precipitation is about 11 inches, with maximum periods of precipitation occurring during the spring and early summer.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Dominson soils and Gas Creek soils. Gas Creek soils have mollic epipedons and are poorly drained.
DRAINAGE AND PERMEABILITY: Well to moderately well drained; medium to slow runoff; moderate to rapid permeability. These soils have fluctuating water tables at some season of the year in some pedons.
USE AND VEGETATION: These soils are used extensively as irrigated pastureland. Native vegetation is mainly three-awn, sand dropseed, ring muhly, Indian ricegrass, and needle and thread grass.
DISTRIBUTION AND EXTENT: The mountain valleys of south-central Colorado. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Chaffee County, Colorado, 1974.
REMARKS: Last updated by the state 8/74.