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.
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