|
26
<br />60II. SIIRVEY
<br />soils and 35 percent Craynor soils. The complex is on
<br />the nplands, mninh•in the northeastern part of the Area.
<br />Dlost areas are more than 20 acres in size and are irregu-
<br />lar in shape. Shingle soils are near ridgetops grid on
<br />steeper slopes. In most places Gaynor soils are near the
<br />base of slopes.
<br />Inchlded with this complex in mapping are areas of
<br />Renohill silty clay loam, 3 to 0 percent slopes; Colby
<br />silty clac loam. 5 to 9 percent slopes; and Samsil elac,
<br />2 to 12 percent slopes. These included soils make up about
<br />15 percent of each mapped area.
<br />Runoff is rapid on this complex. The erosion hazard
<br />is high.
<br />This complex is best suited to pasture. Because the
<br />soils are shallow over bedrock, they are used for dn-
<br />land crops and ppasture. (Capability unit \'Ie-3. nonirri-
<br />gated: tree suitabilit}- group 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 6,800 feet. The native vegetation is mainly mid
<br />grasses. Annual precipitation is 14 to 18 inches. ~D4ean
<br />annual air temperature is 48° to 52° F., and the frost-
<br />free season is about 120 [0140 daps.
<br />In a representative profile the surface ]aver, about 4
<br />inches tllicl;. is strongly calcareous. reddish-brown stony
<br />loam. The underlying material is Keay and reddish-gray
<br />light day loam about 26 inches Mick. linderlyine this
<br />is weathered shale. Soil reaction is moderately alkaline.
<br />Sixmile soils have moderate per-meabilit}•-~ Available
<br />water capacity for the profile is moderate to ]sigh. Roots
<br />can penetrate to a depth between 20 and 40 inches.
<br />These soils are used for grazing.
<br />Representative profile of Sixmile stony loam. 10 to 50
<br />percent slopes, located R50 feet west and 1.000 feet north
<br />of the southeast corner of sec. 8, T. 3 I3., R. i0 Vlr.:
<br />A1--0 to 4 inches, dark reddish-Fray (5FR 4/^_) stone loam,
<br />dart: reddish brown (5TR 3/.) when moist; modea
<br />ate, fine, granular structure; soft, verc friable: mane
<br />stones and boulders: strongly rnirrreous: moder-
<br />atelp alkaline: graduate wave botmda rc.
<br />C1--4 to ?0 inches, gray (5FR 6/1) light claS loam, dart:
<br />gmc (5TR 4)1) when moist; massive; bard, very
<br />friable; strongly ralcarmus; moderately alkaline;
<br />gradual, ways bovndary.
<br />C2-?0 to 30 inches, reddish-gray (lOTR 511) light clay
<br />loam. darl: reddish gene (lOTR 9/1) when moist;
<br />massive; hard, verS triable: stronglc calcareous;
<br />modentelS alkaline: gradual, wave boundarS.
<br />C3--30 to 60 inches, rEddish-gray (lOTR 5/1) partiallS disin-
<br />tegrated shale.
<br />The A bnrizon ranges from 3 to 6 inches in thicl:nesc and
<br />from loam to light daS loam in texture. The C horizon ranges
<br />from loam to clap loam in texture. Depth to bedrock ranges
<br />from ?0 to 40 inches.
<br />Sixmile stony loam, 10 to 50 percent slopes I$mF),-
<br />This sail is on the nplands o{t 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 />Inchlded with this soil in mapping are narrow bands
<br />of Roc)r outcrop and t-ock escarpments. Rock outcrop
<br />is throughout the area, and in most places the escarp-
<br />meats are. on ridgctops. Also included near the base of
<br />slopes arc small areas of Collucial land. Include d Rock
<br />outcrop, rock escarpment, and Collnvial ]and n.ake up
<br />about 20 percent of each mapped area..
<br />Runoff is rapid on this soil. The erosion ha:. red is
<br />high.
<br />All of the acreage of this soil is in native range. (Ca-
<br />pabilih- unit';rIIrl, nouirrigated; tree suitability _roup
<br />6)
<br />Terrace Escarpments
<br />Terrace escarpments (Tel are on side slopes of old o;rt-
<br />wash fans and terraces in the central port of the Area
<br />(fig. 4). Soil areas are long and narrow.
<br />These areas consist of undifferentiated shallow soils
<br />that ]ta.t-e mane cobbles and stones on the surface. In
<br />many places there is merely a thin l;tye.r of cobbles over
<br />sandstone or shale.
<br />Included in mapping are some deeper soils near the
<br />bottom of slopes.
<br />Runoff is rapid. and the erosion hazard is high. Terrace
<br />escarpments take in water slowl-, but in places intake
<br />of water is influenced by the anlottnt of stones and cobble-
<br />stones on the surface. Only limited moisture is available
<br />for plants because these undifferentiated soils are shal-
<br />low.
<br />Terrace escarpments is not suited f:o c»ltit-ation. It. is
<br />used for native ranee. (Capabilityy unit I%IIs-1; nonirti-
<br />gated; tree suitability group 61
<br />Valmont Series
<br />The Valmont series is made up of deep, well-drained
<br />soils. These soils fonned on old high terraces and benches
<br />in gravelly and cobbly loamy allnt-inm. Slopes are 1 to
<br />°5 percent. Elevations are 4.900 to 5.500 feet. The native
<br />vegetation is mainly tall and mid grasses. Annual precip-
<br />itation is 12 to 18~inches. Dlenn annual air temperature
<br />is 48° to 52° F., and the frost-free s~:ason is abort 140
<br />to 155 days.
<br />In a representative profile the surface layer, abort 4
<br />inches thick. i=_ a grayish-brown light clay loam that con-
<br />tains van-ing amounts of cobbles and ~ avel. The upper
<br />part of the subsoil is brown clap ]oa.m abort 3 inches
<br />thick. The middle part is brown light t;lay about 13 inch-
<br />es thick. The lower part is calcareous, light-brown grav-
<br />ellc clay loam about 4 inches thick. The underlying ma-
<br />terial is calcareous. p~nlcish-white and light-brown very,
<br />gravelly loam. In the surface layer, soil reaction is neu-
<br />tral- but with increasing depth it becomes moderately
<br />nikabne.
<br />Valmont soils have moderateh• 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 dn~land crops
<br />and for pasture.
<br />Representative profile of ~%almont cla}• loam, 3 to 5
<br />percent =_lopes, located 800 feet east. of the northwest cor-
<br />ner of sec. 7, T. 3 AT-, R- 691.
<br />AI--0 to 4 inches, grayish-brown (lOTR 5/^) IiFht clap loam,
<br />very darA grayish broom (1OT13 3/?) when moist;
<br />moderate, fine, granular structure: snit, very fri-
<br />able: 5 percent gravel; nem~ral; clear, smooth
<br />boundary.
<br />
|