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<br />orsa Series
<br />Ttvo Orsa series consists of somewhat excessively
<br />drained soils that formed in alluviten froe arkosie
<br />,e J:nentary rock. The nearly level to gently slop-
<br />ing soils are on alluvial fans. Slopes are 1 to 4
<br />Icrccnt. The wage cation is mid and tall grasses.
<br />elevations are 5,500 to 6,60D fc et. Annual precip[-
<br />tation is 15 to 19 inches. Ftean annual soil te:apera-
<br />~urc is 47° Co SO' F., and the frost-froe season is
<br />120 to 135 days.
<br />In a rep resen[ati ve profile the surface layer,
<br />,.Lout 27 inches thick, is dark grayish-brown and
<br />,;ravish-brown coarse sandy loam and gravelly coarse
<br />!oa.:.y sand. Ilve tmderlying material is pale-brown
<br />).ravclly coarse sand extending to a depth of 69
<br />riches or more.
<br />Orsa soils have rapid permeability. Available
<br />ti ..ter capacity is low- Plants can penetrate to a
<br />~:pth of 60 inches or more.
<br />'lost areas of Orsa soils are in native grasses
<br />a:td are used for grating livestock. Small arias are
<br />cultivated to dryland grain or are irrigated and
<br />producing alfalfa.
<br />Tire Orsa soils In the Arca are mapped only in an
<br />.~sociation with Bl ak eland soils. This mapping unit
<br />~s dcsc ribed under the heading "Blak el and Se ri cs ."
<br />Representative profile of an Orsa coarse sandy
<br />lua:t, 1,300 feet north and 500 feet west of the
<br />~~~utheast corner of sec. 12, T. 8 S., R. 69 W.:
<br />:1~-0 to E inches, dark grayish-brown (10TR 4/2)
<br />coarse sandy loa.•o, very dark brown (lOYR Z/?)
<br />v.hcn no is y node rate, fine, granular st ruc[ure;
<br />soft, very friable; S percent fine and very
<br />fine, angular, granitic gravel; slightly acid
<br />(pll G.4); gradual, smooth boundary.
<br />..--8 to 20 inch cs, dark grayish-brown (lOYR 4/2)
<br />light coarse sandy loam, very dark brown
<br />(lOtk 2/2) when moist; weak, medium, prismatic
<br />structure parting to weak, medium, sub angular
<br />blvcky; hard, very friable; 10 percent fine and
<br />very fine, angular, granitic gravel; newt ral
<br />(pH G.6); gradual, smooth boundary.
<br />' ,~-20 tv 27 inches, grayish -b roan (lOYR 5/?) grav-
<br />clly loamy eoa rsc sand, very dark grayish
<br />L.*wn (1 U'(R 312) when moist; very weak, made un,
<br />suL a.~gular blocky structure; hard, very fri-
<br />~Llc; 15 percent fine and vc ry fine, angular,
<br />granitic gravel; neutral (pll G.6); gradual,
<br />5cvoth boundary.
<br />[7 to GO inches, pale-brown (101'R G/3) gravelly
<br />wane loany sand, brown (lOYR 5{3) when roiat;
<br />siu;;lc grain; loose when dry or ra ist; 30 per-
<br />cent fine anJ very fine, an y-ular, granitic
<br />grr.cl; neat ral (pH G-8).
<br />l-uc Or+a soi is arc uniform to row g`iout the sun~cy
<br />~a, but they airy slightly in tcatu ce of the C
<br />~~r::on, v~hi dr raters frcm gravelly IOaR)' soars c• sarJ
<br />, g,.,rclly coarse sand. In places thr dark-c^IorrJ
<br />.r f:~~c• Dyer is r,o re [h an -'0 inches [hick.
<br />
<br />Pc rrypa rk Series
<br />The Perrypark series cunsists of well-drained
<br />soils that formed in alluvium from reddish-brown
<br />ark osie sedimentary rock. These gently sloping to
<br />agderately steep soils arc on alluvial fans and
<br />valley side slopes. Slopes arc 3 to 20 percent.
<br />Tha vegetation is mid and call grasses. Elevations
<br />are 6,000 to 7,000 feet. Annual precipitation is 17
<br />to 19 inches. 1•k an annual soil Ce mperature is 4S°
<br />to 47° F., and the frost-free season is 125 Jays or
<br />less.
<br />In a representative profile the surface layer is
<br />dark redJish-gray sandy loam about 7 inches thick.
<br />The subsoil, about 43 inches chick, 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 />Perryp ark soils havo 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 arc 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 fee[ south and 400 feet east of the northwest
<br />corner of the southwrs[ quarter of sec. 31, T. 9 S.
<br />R. 67 W.:
<br />AI--O to 7 inches, dark reddish-gray (51'R M1l21 sandy
<br />loam, dark reddish brown (SYR 2/2) when resist;
<br />moderate, fine, granular structure; soft, very
<br />friable; 5 percent Cinr, angular, granitic
<br />gravel; neutral (pH 6.8); clca r, smooth bound-
<br />s ry .
<br />81--7 to 12 inches, dark reddish-gray (SYR 4/2)
<br />heavy sandy loam, dart: reddish brown {SYR 2j2)
<br />when moist; weak, medium, prismatic structure
<br />parting [o moderate, medium, sub an gular blocky;
<br />hard, very friable; feu, thin, patchy clay
<br />files principally on vertical faces of pods; 5
<br />potent gravel; newt ral (p}I 6.B); clear,
<br />smooth holm des ry.
<br />8.'t--12 to 36 inches, reddish -b roan (2 ,SYR S/4)
<br />sandy clay loam, redJiSh brown (2.SYR 4(4)
<br />when r..oist; moderate, medium, prismatic sCruc-
<br />ture parting to nodcratc, medium and fine,
<br />sub an gular blocky; eat remelt' hard, very fri-
<br />able; thin nearly continuous clay filru on
<br />faces of pets; 5 pe reen[ gravel; neutral (pH
<br />6.8); clear, smooch boundary.
<br />B}--3G to 50 inches, re JJtsh-h roan (2.51'R 5/4) heavy
<br />sandy loan, reddish hro~.:n (2.SYR 4/4) when
<br />moist; weak, medrum, s~~b angular blocky struo-
<br />[arc; cxtrc melt' hard, ve rv friable; Fcw, thin,
<br />patchy clay films on faces of pe ds; 5 percent
<br />gravel; nc ut rnl (pll G.°); gradual, wavy bound-
<br />ary.
<br />G -SO to 6u 'tn:he~, light reddish-brown (2.SYR 6/d)
<br />sandy loam, reddish b Ntin (2.51'R 5/3) when
<br />noi,t; et~sice; ezc re Welt' hard, very friable;
<br />5 pcrernt gravel; ne•~it ral (pH G.9J.
<br />r EXHIBIT "D" - Wildlife, Water
<br />Resources, Vegetation and Soil Information
<br />Page 6
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