LOCATION PERCETON CO+WYEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Typic Glossocryalfs
TYPICAL PEDON: Perceton sandy loam, forested. (Colors are for dry soil unless otherwise noted.)
01--2 to 1 inch; undecomposed organic material principally needles, bark, twigs, and leaves.
02--1 inch to 0; partially decomposed organic material like that of the horizon above.
A2--0 to 10 inches; very pale brown (lOYR 7/4) sandy loam, yellowish brown (10YR 5/4) moist; weak thick platy structure that parts to fine granules; soft, very friable, nonsticky and nonplastic; 10 percent gravel with some cobbles; neutral (pH 6.8); gradual wavy boundary. (4 to 20 inches thick)
A&B--10 to 20 inches; mixed colors including very pale brown (10YR 7/4) and yellowish brown (10YR 5/4) heavy sandy loam, yellowish brown (10YR 5/4) and dark yellowish brown (10YR 4/4) moist weak coarse subangular blocky structure that parts to medium subangular blocks and coarse granules; slightly hard, very friable, nonsticky and nonplastic; some of the more clayey peds are hard, very friable; thin glossy patches on some faces of the more clayey peds and in some root channels and pores; 5 percent gravel; this horizon consists of nodules and seams of clayey material like that of the underlying horizon embedded in a light colored matrix like that of the overlying horizon; neutral (pH 6.6); gradual wavy boundary. (4 to 20 inches thick)
B2t--20 to 30 inches; yellowish brown (10YR 5/4) sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate coarse subangular blocky structure that parts to medium and fine subangular blocks; slightly hard, very friable, slightly sticky and slightly plastic; peds are very hard, firm; continuous wax-like coatings on faces of peds and in roots channels and pores; wax-like bridges between sand grains; 5 percent gravel; neutral (pH 6.6); gradual wavy boundary. (5 to 47 inches thick)
B3--30 to 34 inches; pale brown (10YR 6/3) sandy loam, brown (10YR 5/3) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few thin glossy patches on some faces of peds; 5 percent gravel; neutral (pH 6.6); gradual wavy boundary. (0 to 7 inches thick)
C--34 to 60 inches; soft noncalcareous sandstone and interbedded loamstone.
TYPE LOCATION: Jackson County, Colorado; approximately 400 feet north and 375 feet east of W1/4 corner Sec. 17, T. S N., R. 78 W.
RANGE IN CHARACTERISTICS: Mean annual soil temperature is about 40 degrees F., and mean summer soil temperature is about 51 degrees F. Base saturation ranges from 60 to 100 percent in all subhorizons of the argillic horizon. Depth to the paralithic contact ranges from 20 to 40 inches. Depth to the top of the argillic horizon is less than 24 inches and depth to the base of the argillic horizon ranges from 17 to 40 inches. Rock fragments range from 0 to 35 percent in a major part of the solum and any C horizon and these are mainly 1/4 to 10 inches in diameter.
The A1 horizon, if present, has hue of 2.5Y through 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 1 through 3. It ranges from medium acid to mildly alkaline.
The A2 horizon has hue of 5Y through 7.5YR, value of 5 through 8 dry, 4 through 6 moist, and chroma of 1 through 6. It ranges from medium acid to mildly alkaline.
The B2t horizon has hue of 5Y through 7.5YR, value of 5 through 7 dry, 4 through 6 moist, and chroma of 1 through 6. It is typically sandy clay loam but averages 18 to 35 percent clay, 5 to 30 percent silt, and 40 to 75 percent sand with more than 35 percent fine or coarser sand. This horizon ranges from medium acid to mildly alkaline.
COMPETING SERIES: These are the Edloe, Grimstone, Indart, Lick, Peeler, Sapphire, Swapps, Swifton, Tahoma, Tongue River, Trapper, Uinta, Whitefish, and Woodrock series. Edloe, Sapphire, Swapps, and Woodrock soils have a lithic contact at depths of less than 40 inches. Grimstone and Tongue River soils have argillic horizons with less than 35 percent fine or coarser mica of sufficient size to influence the soils physical character. Indart soils developed in parent material weathered from redbeds, shales, and sandstones and have lithochromic hue of 5YR or redder. Lick, Peeler, Swifton, Trapper, Uinta, and Whitefish soils lack a paralithic contact at depths of less than 40 inches. Tahoma soils lack A2 or A&B horizons and have strongly or very strongly acid B2t horizons.
GEOGRAPHIC SETTING: Perceton soils are on hills, ridges, and mountain side slopes. Slopes typically range from about 4 to 60 percent. These soils formed in moderately thin, moderately coarse textured noncalcareous material weathered from soft sedimentary sandstone and interbedded loamstone. At the type location the mean annual precipitation is about 20 inches with peak periods of precipitation in the spring and summer. Mean annual temperature is 36 degrees F., and mean summer temperature is 52 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hyannis soils and the competing Peeler soils. Hyannis soils are coarser textured and have argillic horizons in which silicate clay is accumulating as lamellae.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used for grazing or timber production. Native vegetation is lodgepole pine, spruce, fir, wild rose, and juniper.
DISTRIBUTION AND EXTENT: Mountainous areas of Colorado. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Jackson County, Colorado, 1973.
REMARKS: Last updated by the state 12/75.