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26 <br />SOII. SIIRVEY <br />soils and J5 percent ('rnynor soils. The comples is on <br />the nplands, mainly in the northcastetm part of the Area. <br />D1ost areas are more than °_0 acres in size and are irree r- <br />lar in shape. Shingle soils are near ridgetops and on <br />steeper slopes. In most places Gaynor soils are near the <br />base of slopes. <br />Included with this comples in mapping are areas of <br />Renohill silty clay loam, .', to 9 percent slopes; Colby <br />silty day loam. 5 to 9 percent slopes; and Samsil clay, <br />3 to ]4 percent slopes. These included soils make up about <br />]5 percent of each mapped area. <br />Runoff is rapid on this comples. The erosion hazard <br />is high. <br />This complex is best suited to pasture. Iiecallse the <br />soils are shallop- over bedrock, they are used for dre- <br />land crops and pasture. (Capnbili[y~unit PIe-3, nonirri- <br />gated:tree suitability ~ oup 6) <br />Sixmile Series <br />The Sixmile series is made up of moderately deep, <br />well-drained soils. These soils formed on upland ridges <br />and side slopes in calcareous loamy residuum weathered <br />from shale. Slopes are 10 to 50 percent. Elevations are <br />5,800 to 6,fi00 feet. The native vegetation is mainly mid <br />grasses. Anneal precipitation is 14 to 18 inches.~Alean <br />annual air temperature is 4S° to 52° F., and the frost- <br />free season is about 1~0 to 140 da}~s. <br />In a representative profile the surface laver, about 4 <br />inches tllicl;, is strongly calcareous, reddish-brown stony <br />loam. The underlying material is n-ra}}• and reddish-gray <br />light clay loam about ~6 inches Mick. Ilnderlyino this <br />is weathered shale. Soil reaction is moderately alkaline. <br />Sixmile soils have moderate permeabilitc.~ Available <br />water capacity for the profile is moderate to lti~h. Roots <br />can penetrate to a depth between ?0 and 40 inches. <br />These soils are used for grazing. <br />Representative profile of Sixmile stony loam. 10 to 50 <br />percent slopes.]ocnted 650 feet west and 1A00 feet north <br />of the southeast. corner of sec. 8, T. 3 AT., R. 'r0 R'.: <br />Al--0 to 4 inches, dart: reddish-Fray (5TA 4/2) 9[onr loom, <br />dnrL• reddish brown (5TR 3/2) when moist; moder- <br />ate. Hnc, granular struMUre; soft. very friable; many <br />stones and boulders: stronglS calcareous; moder- <br />ately alkaline; gradual, wary bovndarc. <br />Cl-4 to 20 inches, gray (5TR 6/1) light clac Inam, darl: <br />gray (5TR 4/1) when moist; massive: hard, eery <br />trlnble; stronglT calcareous; moderately alkaline; <br />gradual, wavy boundary. <br />C2-20 to 30 inches, reddish-grnc (IOTA 5/1) light clap <br />loam, dark reddish grac (IOTA 411) when moist; <br />massive: hard, very friable; stronglc calcareous; <br />modentelp alkaline; gradual, wary boundary. <br />C3-30 to 60 Inches. reddish-gray (10TR 5(1) partially disin- <br />tegrated shale. <br />The A horizon ranges from 3 to 6 inches in thicl:nesc and <br />from loam to light clac loam in tectnre. The C horizon ranges <br />from loam to clay loam in texture. Depth to Ledrock ranges <br />from 20 to 40 inches. <br />Sixmile stony loam, 10 to 50 percent slopes fSmFl.- <br />This soil is on the nplands on the western side of steep <br />ridges in the western part of the Area. In most places <br />it is in areas more than 100 acres in size. <br />Included with this soil in mapping are narrow bands <br />of Rocl: outcrop and rock escarpments. Rock outcrop <br />is throughout the area, and in most places the escarp- <br />meats are on ridgetops. Also included near the base of <br />slopes arc small areas of Collllvial land. Include d Rock <br />outcrop, rock escarpment. and Colluvial land n.ake up <br />about °_0 percent of each mapped area. <br />Runoff is rapid on this soil. The erosion ha:. trd is <br />high. <br />All of the acren~e of this soil is in native range. (Ca- <br />pability unit':%IIrl, nonirrigated; ~;ree suitability - coup <br />6) <br />Terrace Escarpments <br />Terrace escarpments ITeI are on side slopes of old o~;t- <br />wash fans and terraces in the central part of the Area <br />(fig. 4). Soil areas ore long and narrow. <br />These areas wnsist of undifferentiated shallow soils <br />that here many cobbles and stones on the surface. In <br />mane places there is merely a thin layer of cobbles over <br />sandstone or shale. <br />Included in mapping are some daeper soils near the <br />bottom of slopes. <br />Runoff is rapid, and the erosion ha::ard is high. Terrace <br />escarpments take in venter slowly. tut in places intake <br />of venter is influenced be the amount of stones and cobble- <br />stones on the surface. Onlc limited moisture is available <br />for plants because these undifferentiated soils are shal- <br />low. <br />Terrace escarpments is not suited to clltivation. It is <br />used for native range. (Capability unit ~rIIs-1, nonirri- <br />gated; tree suitability group 6) <br />Valmont Series <br />The t%almont series is made up of deep, well-drained <br />soils. These soils formed on old high terraces and benches <br />in gravelly and cobble loamy allurinm. Slopes are 1 to <br />25 percent. Elevations are 4.900 to 5.500 feet. The native <br />vegetation is mainly tall and mid grasses. Annual precip- <br />rtatlon is 12 to 18~inches. \Ican annual air temperature <br />is 4R° to 52° F., and the frost-free season is abort 140 <br />to 155 days. <br />in a representative profile the surrace laver, abort 4 <br />inches thick. is a grayish-brown light ,Inv loam that con- <br />tains varc-ing amounts of cobbles and gravel. The upper <br />part of the subsoil is brown clay loam abort 3 inches <br />thick. The middle part is brown light clay about 13 inch- <br />es thick. The lower part is calcareous. light-brown grav- <br />elly clay loam abort 4 inches thick. The underlying ma- <br />terla] is calcareous. pinkish-white arc'. light-brown very <br />gracelh• loam. In the surface ]nyer, soil reaction is neu- <br />tral, bilt with iucrensing depth it b~;comes moderately <br />alkaline. <br />nalmont. soils have moderately slow permeability. <br />Available water capacity for the profile is moderate. <br />Roots can penetrate to a depth of fi0 inches or more. <br />These soils are used for irrigated and drpland crops <br />and for pasture. <br />Representafiive profilr. of ~%almont clay loam, 3 to 5 <br />percent slopes, located S00 fart cast of the northwest cor- <br />nerofsec. i,T.3N.,R.69T'V.: <br />Al--0 ro 4 inches, grncish-brown (IOTA 5/2) light clay loam, <br />very dark grncish brown (]OTR 3/°) when moist; <br />mnderste, fine, granular s[ruclure; soft, very fri- <br />able; 5 tiercrnt gravel; neutral: clear, smooth <br />boundary. <br />