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<br />Orsa Series
<br />The Orsa series consists of somexhat excessively
<br />drained soils that formed in alluvium from arkosic
<br />sedimentary rock. The nearly level to gently slop-
<br />ing soils are on alluvial fans. Slopes are 1 to 4
<br />pcrce nt. The vegetation is mid and tall grasses.
<br />Elevations are S,S00 to 6,600 feet. Annual precipi-
<br />tation is 15 to 19 incites. Die an annual soil tempera
<br />ture is 47° to SO° F., and the frost-free season is
<br />120 to 135 days.
<br />In a representative profile the surface layer,
<br />about 27 inches thick, is dark grayish-brown and
<br />grayish-broxn coarse sandy loam and gravelly coarse
<br />loamy sand. The underlying material is pale-broxn
<br />gravelly coarse sand extending to a depth of 60
<br />inches or more.
<br />Orsa soils have rapid permeability. Available
<br />water capacity is low. Plants can penetrate to a
<br />depth of 60 inches or more.
<br />hfost areas of Orsa soils are in native grasses
<br />and are used for grazing livestock. Small areas are
<br />cultivated to dryland grain or are irrigated and
<br />producing alfalfa.
<br />The Orsa soils in the Area are mapped only in an
<br />association xi[h Blak eland soils. This mapping twit
<br />is described under the heading "Blakel and Series."
<br />Representative profile of an Orsa coarse sandy
<br />loam, 1,300 feet north and 500 feet zest of the
<br />southeast corner of sec. 12, T. 8 S., R. 68 W.:
<br />H11--0 to 8 inches, dark grayish-brown (lOYR 4/2)
<br />coarse sandy loam, very dark brown (lOYR 2/2)
<br />when moist; moderate, fine, granular structure;
<br />soft, very friable; 5 percent fine and very
<br />fine, angular, granitic gravel; slightly acid
<br />(pll 6.4); gradual, smooch boundary.
<br />A12--8 to 20 inches, dark grayish-brown (lOYR 4/2)
<br />light coarse sandy loam, very dark brown
<br />(lOYR 2/2) when moist; weak, medium, prismatic
<br />structure parting to weak, ne di um, suban gular
<br />blocky; hard, very friable; 10 percent fine and
<br />very fine, angular, granitic gravel; neutral
<br />(pH G.6); gradual, smooth b~>undary.
<br />t13--20 to 27 inches, grayish-broxn (lOYR SJ2) grav-
<br />elly loamy coarse sand, ve ri dark grayish
<br />broxn (lOYR 3/2) when moist; very weak, medium,
<br />sub an gular blocky structure; hard, very fri-
<br />able; 15 percent fine and very fine, angular,
<br />granitic gravel; neutral (pit 6.6); gradual,
<br />smooth boundary.
<br />---27 to 60 inches, pale-brown (IOYR 6/3) gravelly
<br />coarse loamy sand, brown (lOYR 5/3) when moist;
<br />single grain; loose when dry or Hoist; 30 per-
<br />cent fine and very fine, angular, granitic
<br />gravel; neutral (pH 6.8).
<br />The Orsa soils are uniform throughout the survey
<br />ire a, but they vary slightly in ta,x[ure of the C
<br />io ri zon, whi clt ranges from gravel:. }• loamy coarse sand
<br />co gravelly coarse sand. In places Che dark-colored
<br />.urFace layer is more than 20 inches thick.
<br />i
<br />Perrypark Series
<br />The Perrypark series consists of well-drained
<br />soils that formed in alluvium from reddish-brown
<br />arkosic sedimentary rock. These gently sloping to
<br />moderately steep soils are on alluvial fans and
<br />valley side slopes. Slopes are 3 to 20 percent.
<br />The vegetation is mid and tall grasses. Elevations
<br />~a re 6,000 to 7,000 feet. Annual precipitation is 17
<br />to 19 inches. Dlean annual soil temperature is 4S°
<br />to 47° F., and [he frost-free season is 125 days or
<br />less.
<br />In a representative profile the surface layer is
<br />dark reddish-gray sandy loam about 7 inches thick.
<br />The subsoil, about 43 inches thick, is dark reddish-
<br />gray and reddish-brown sandy clay loam and heavy
<br />sandy loam. The underlying material is light red-
<br />dish-brown sandy loam extending to a depth of 60
<br />inches or more.
<br />Perrypark soils have moderate permeability. Avail-
<br />able water capacity is high. Plants can penetrate
<br />to a depth of 60 inches or more.
<br />Most areas of Perrypark soils are in native
<br />grasses and are used for grazing livestock. A few
<br />areas have been cultivated, but most have been re-
<br />seeded to grass. Urban development has taken place
<br />in some areas.
<br />Representative profile of a Perrypark sandy loam,
<br />800 feet south and 400 feet east of the northwest
<br />corner of the southwest quarter of sec. 31, T. 9 S.
<br />R. 67 W,:
<br />AI--O to 7 inches, dark reddish-gray (SYR 4/2) sandy
<br />loam, dark reddish brown (SYR 2/2) when moist;
<br />moderate, fine, granular structure; soft, very
<br />friable; 5 percent fine, angular, granitic
<br />grave]; neutral (pH 6.8); clear, smooth boiatd-
<br />ery.
<br />B1--7 to 12 inches, dark reddish-gray (SYR 4/2)
<br />heavy sandy loam, dark reddish brown (SYR 2/2)
<br />when moist; weak, medium, prismatic structure
<br />parting to moderate, medium, sub angular blocky;
<br />hard, very Friable; few, thin, patchy clay
<br />films principally on vertical faces of peds; S
<br />percent gravel; neutral (pH 6.8); clear,
<br />smooth boundary.
<br />BZt--12 to 36 inches, reddish-brown (Z.SYR 514)
<br />sandy clay loam, reddish brown (2.SYR 4/4)
<br />when moist; moderate, medium, prismatic struc-
<br />ture parting to moderate, medium and fine,
<br />sub angular blocky; extremely hard, very fri-
<br />able; thin nearly continuous clay films on
<br />faces of peds; 5 percent gravel; neutral (pH
<br />6.8); clear, smooth boundary.
<br />B3--36 to 50 inches, reddish-brown (2.SYR S/4) heavy
<br />sandy loam, reddish brown (2.SYR 4/4) when
<br />moist; weak, medium, sub angular blocky struc-
<br />ture; extremely hard, very friable; few, thin,
<br />patchy clay films on faces of peds; 5 percent
<br />gravel; neutral (pH 6.8); gradual, wavy bound-
<br />ary.
<br />C--50 to 60 inches, light reddish-brown (Z.SYR 6/4)
<br />sandy loam, reddish brown (2.SYR S/4) when
<br />moist; massive; extremely hard, very friable;
<br />5 percent gravel; neutral (pH 6.8).
<br />30 EXHIBIT "D" -Wildlife, Water
<br />Resources, Vegetation and Soil Information
<br />Page 6
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