1988-04-29_PERMIT FILE - C1981008A (47)

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43 Established Series Rev. AJC/CJF 5/73 PERSAYO SERIES The Persayo series is a member of the loamy, mixed (calcareous), mesic�shallow family of Typic Turriorthents. Persayo soils are calcareous throughout and typically have thin, slightly darkened Al horizons and moderately fine textured C horizon. over soft shale or siltstone at d depth of 14 inches. TYL)if-Yinh P_don: Persayo silty clay loam - grassland (Culurs are for dry suit unless otherwise noted.) Al U-4"--Light yellowish brown (2.5Y 6/3) light silty clay loam, light olive brown (2.5Y 5/3) moist; moderate fine granular structure, weak platy in the upper 1/2 inch; soft, very friable; calcareous; moderately alkaline (pH 8.2); gradual smooth boundary. (3 to 7 inches thick) Cl 4-14"--Light yellowish brown (2.5Y 6/4) light silty clay loam, light olive brown (2.5Y 5/4) moist; weak medium subangular blocky structure that parts to moderate fine granules; hard, very friable; few small calcium sulfate crystals; calcareous; moderately alkaline (pH 8.2); gradual smooth boundary. (7 to 14 inches thick) C2 14"--Calcareous, gray and yellow shales and siltstones. Type Locatfun: Montrose County, Colorado; 0.1 mile north of the SF. corner of sec. 22, T.51N. , R.lOW. Rangy in Characteristics: Depth to the underlying paralithic contact ranges from 10 to 20 incles. Organic carbon in the surface 15 inches or in the soil above the bedrock is approximately .4 percent. The sand/clay ratio ranges from less than 1 to about 3. Exchangeable sodium is typically less than 3 percent, but tends to increase as depth increases and differs among pedons. Cdlciwn w rbunate equivalent ranges from about 5 to 14 percent and calcium sulfate ranges from less than 1 to about 10 percent. The series control section is typically heavy silt loam or light silty clay loam, but clay ranges from 18 to 35 percent, silt from 30 to 65 percent and sand from 5 to 45 percent. Coarse fragments are usually less than 5 percent and range from 0 to 15 percent. Mean annual soil temperature ranges from 47' to 58°F. Mean summer soil temperature ranges from 60° to 75°F. These soils are dry in all parts of the moisture control section for more than 3/4 of the time that the soil temperature is above 41°F. The A horizon has hue of 10YR through 5Y, value Of 5 through 7 dry or 4 or 5 moist, and chruma of 2 through y. It is moderately or strongly alkaline (pH 8.0 to 9.0) and is soft to slightly Bard. The C horizon has hue of IOYR through 5Y. It is moderately or strongly alkaline (pil 8.0 to 9.0). It ,untains some visible calcium carbonate and calcium sulfate which are not concentrated into a definite hurizon of secondary accumulation and are considered to be characteristics of the par.nL sediments rather than pedogentc. CumheLing Series and [heir Differentiae: These are the Birdsley, Oceanet, and Shalet series. Birdsley soils have more than 15 percent exchangeable sodium. Oceanet soils have less than 18 percent clay and more than 52 percent sand in the series control section. Shalet soils have hue of 5YR or redder. Setting: 'these soils are on moderately to steeply sloping upland hills and ridges. Slope grac!ients range from 2 to about 45 percent. The soils formed in thin sediments weathered from underlying buff sedimentary bedrock. At the type location average annual precipitation is 8 inches with peak periods of precipitation Occurring during the spring and early summer. Mean annual temperature is 53' F. and mean summer temperature is 70°F. Principal Associated Soils: These are the Chipeta and Menoken soils. Chipeta soils have mure than 35 percent clay in the series control section. Menoken soils lack bedrock above a depth of 20 inches and have cambic horizons. Drainage and Permeability: Well-drained; medium to rapid runoff; moderately slow permeability Use and Vegetation: Used almost exclusively for native pastureland. Native vegetation is salt sage, greasewood, shadscale, and scattered grasses. Distribution and Extent: Western Colorado and Wyoming, northwestern New Mexico, and eastern Utah. fire-series is of large extent. Series Established: Western Colorado Reconnaissance, W95, 1939. National Cooperative Soil Survey U. S. A.