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<br />SOII. SIIRVEY
<br />Included with this soil in mapping are small areas of
<br />Gaynor silty clay loam, 3 to 9 percent slopes, and Reno-
<br />hill silty clay loam, 3 to 9 percent slopes. These included
<br />soils make up about 20 percent of each mapped area.
<br />Runoff is rapid on this soil. The erosion hazard is high.
<br />About 70 percent of the acreage of this soil is used for
<br />irrigated or dryland crops. The remaining third is used
<br />for pasture. (Capability units IVe-1, irrigated, and VIe-1,
<br />nonirrigated ;tree suitability group 3)
<br />Colby silty clay loam, wet, 0 to 3 percent slopes
<br />1C5B1.-This soil is in upland valleys in the northeastern
<br />part of the Area.iVfost areas are irregularly shaped and
<br />more tltalt 15 acres in size.
<br />The profile of this soil is much like the one described
<br />as representative for the series, but t]Le underlying mate-
<br />rial is n stratified calcareous silty clay loam and light
<br />silty clay that has salt accumulations. The lower part of
<br />the under]yina materiel is faintly mottled.
<br />Included with this soil in mapping are small areas of
<br />Colby silty clay loam, 1 to 3 percent slopes; and 11Teld
<br />loam, 1 to 3 percent slopes. These make up about 15 per-
<br />cent ofeach mnppedarea.
<br />Runoff is medium on this soil. The erosion ]Lazard is
<br />slight to moderate. As a result of irrigation on ]tigher
<br />lying soils, mainly during summer, a seasonal high water
<br />table is at a depth of 2 to 4 feet in this soil.
<br />hfost of the acreage of this soil is cultivated, but some
<br />areas are toed for irrigated pasture. (Capability unit
<br />IIw-1, irrigated; treesuitability group 6)
<br />Colby-Gaynor association (5 to 9 percent slopes)
<br />ICiI.-This association is on the uplands, mainly in the
<br />northeastern pert of the Area. It is about 55 percent Colby
<br />silty clay loam, and about 30 percent Gaynor silty clay
<br />loam. The Colby soil is near the tops and the bottoms
<br />of slopes, and the Gaynor is mainly in the steeper middle
<br />part. ,
<br />Included with this association in mapping nre a few
<br />small areas of Shingle loam, of Iiim soils, and of small
<br />gravel-capped knobs. These make up about 15 percent of
<br />each mapped urea.
<br />Rtmof[ is rapid on this soil association. The erosion
<br />ILazard is high. ~
<br />All of the acreage of this soil association is used for
<br />irrigated or dryland crops ar for pasture. (Capability
<br />units IVe-1, imgated, and VIe-1, nonirrigated; tree
<br />suitability group 3)
<br />Colluvial Laud
<br />Colluvial ]and (Col is in long narrow calle}~s in the
<br />western part of file Area. This ]and type varies widely
<br />in depth, texture, color, reaction, and stoniness. The sur-
<br />face layer is mainly n sandy loam that contains varying
<br />amounts of stones and cobbles. The underlying material
<br />ranges from loamy sand to clay. The soil material ranges
<br />from slLnllow to deep. Lime content ranges from strongly
<br />calcareous to noncalcareous, and reaction ranges from
<br />neutral to moderately alkaline. .Yost areas nre dark
<br />colored, but some are light colored. .
<br />Colluvial land receives runoff from adjacent slopes.
<br />The erosion hazard is ILigh. bfost Wrens of Colluvial ]and
<br />'have stones and cobbles on the surface that interfere with
<br />Cnltl VatlOn.
<br />Yost of the acreage is used for orass. Some small local
<br />areas that were once farmed hace~een reseeded to grass.
<br />These reseeded areas hate fewer stones on the surface.
<br />(Capa.bility unit VIIs-1, nonirrigated; tree suitability..
<br />group 6)
<br />ern- Cli.. 55eries~
<br />The Fern Cliff series is made up of deep, well-drained
<br />soils. These soils formed in loamy mired alluvium on
<br />short fans and valley side slopes lit the mountain area.
<br />Slopes are 15 to 60 percent. Elevations are 6,300 to 8,200
<br />feet. The native vegetation is mainly a forest of ponder-
<br />osa pine and Douglas-fir with a sparse understory of grass.
<br />Annual precipitaWon is 18 to 24 inches, dean annual air
<br />temperature is 43° to 47° F., and the frost-free season is
<br />about 30 to 12U days.
<br />In a representative profile the surface layer is dark
<br />grayish-brown stony sandy loam about 3 inches thick.
<br />The subsurface layer, about 17 inches thick, is light-gray
<br />stony sandy loam. The upper part of the subsoil, about 9
<br />inches thick, is light-gray and yellowish-brown stony
<br />sandy loam and sandy clay loam. The sandy clay loam is
<br />in thin layers and bands in the sandy loam. The lower
<br />part of the subsoil is light brownish-gray and yellowish-
<br />brown stony sandy clny_loam and sandy loam about 31
<br />inches thick. Below this is light yellowish-brown sandy
<br />loam that contains many stones.
<br />Fern Cliff 'soils have moderate to moderately rapid
<br />permeability. Available water capacity for the profile is
<br />modenfe. Roots can penetrate to a depth of 60 Inches or
<br />more.:lfoderate amounts of stone are on the surface and
<br />throughout the profile.
<br />Reaction in the tipper part of the surface layer isslightly
<br />acid, and in the subsurface layer it is medium acid. In the
<br />sulisoil and substratum it is slightly acid.
<br />These soils are used for pasture, for recreation nitd
<br />forestry, and for homesites.
<br />Typical profile of Fern Cliff stony sandy loam in Fern
<br />Cliff-Aliens Park-Rock outcrop comples, 15 to 60 percent
<br />slopes, located 1,400 feet south and 2,400 feet west of the
<br />northeast corner of sec .5, T.1 N., R. 71 `V.
<br />O1~ inches to 2, undecomposed organic material, chiefly
<br />needles, bark, and Cw(gs.
<br />02-2 inches to 0, partially decomposed organic matter like
<br />that oL the horizon stave.
<br />Alm to 3 SncLes, dark grayish-brown (lOYR 4/2) stony
<br />sandy loam, very dark brown (lOYR 2/2) when
<br />moist; strong, Hne, crumb structure; so[t, very Srl-
<br />able; 15 W 20 percent stone; slightly acid; clear,
<br />smooth boundary.
<br />A2~3 to 20 Inches, ligh[•grap (lOYR 712) sandy loam, gray-
<br />fah brown (lOYR 5/2) when moist; weak, Hne, platy
<br />structure that parts to moderate Hne grennlar; soft,
<br />very Srlable; 15 to 20 percent stone; medtum acid;
<br />gradual, wavy boundary.
<br />A&8-20 to 29 inches, Ilght-gray (lOYR 7/2) stony heavy
<br />sandy loam, grayish brown (lOYR 5/2) when moist;
<br />weal:, Hoe, subangular blocky structure; horizon con-
<br />tains thin, dtscontlnuous, yellowish-brown (lOYR
<br />5/4) sandy clay loam lamellae and seams that arc
<br />dark yellowish brown (lOYR 9/4) when moist; in
<br />some places a soft matrix and very hard lamellae,
<br />and In others every- Lrlsble matrix and friable lamel-
<br />1ae; thin, nearly contlnuous clay ftlms an pad [aces
<br />in lamellae; 20 percent o[ roll horizon Is stone; hori-
<br />zon 1s slightly acid; diC[use, wavy boundary.
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