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Exh~t H - 51te DeacriQtlon
<br />LARITtER COUNTY AREA, COLORADO
<br />dryland management it is suited to pasture and native
<br />grasses. Cnpabilit;r units IIIe-2, irrigated, and IVe-3,
<br />dryland; Loamy Plains rmtge site; windbreak suit-
<br />ability group 1.
<br />55-Kim loam, S to 9 pcrccnt elopce. This strongly
<br />sloping soil is on uplands and fans. This soil has the
<br />profile described as representative of the series.
<br />Included with this soil in mapping are small areas of
<br />soils that have a sut•face layer and subsoil of clay loam
<br />or silt loam and a few small areas of soils that have
<br />gravel on the surface. Also included are minor areas of
<br />Stoneham and Tlu:dalwtd soils.
<br />Runoff is rapid, and the hazard of erosion is severe.
<br />If irrigated, this soil is well suited to pasture xnd, to
<br />a lesser extent, barley, alfalfa, and wheat. Under dry-
<br />land management it is suited to pasture and native
<br />grasses. Capability units IVe-1, irrigated, attd VIe-1,
<br />dryland; Loamy Plains range site; windbreak suit-
<br />ability group 1.
<br />SG-Kim-Tlredalaud foams, 3 to 15 pcrccnt elopce.
<br />This complex consists of gently sloping to moderately
<br />steep soils on uplands, fans, and valleysides. It is about
<br />45 percent ICim loam and about 35 percent '1'hedalund
<br />loam. I{im loam is smoother and less sloping, and
<br />Thedalund loam is steeper. These soils have profiles
<br />similar to the ones ~iesct•ibed as representative of their
<br />respective series, but the surface layer is about 4 or 5
<br />inches thick.
<br />Included with these soils iu mapping are a few small
<br />areas of ltenohill and Midway soils, a few small out-
<br />crops and grave] ]snobs, and some small seep spots.
<br />Runo1l is rapid, and the hazard of erosion is severe.
<br />These soils are mainly used for pasture nod native
<br />grasses. Capability unit VIe-1, dryland; Loamy Plains
<br />range site; ~vindbre:dc suitability group 1.
<br />Kirtley Scrics
<br />The I{irtley series consists of moderately deep, well
<br />drained soils that formed in material weathered from
<br />reddish brown sandstone and shale. These soils are on
<br />uplands and side slopes and az•e underlain by soft shale
<br />at a depth of 20 to 90 incites. I:Icvation r:wges flora
<br />6,600 to 6,900 feet. Slopes xre 3 to 15 percent. The
<br />native vegetation i:: rnaittly blue grams, side-oats
<br />grams, western wheatgrass, yucca, and rabbitbrush.
<br />bless annual precipitation ranges from lei to 18
<br />inches, mean annual air temperature ranges from 97°
<br />to 50° F, and the frost-free season ranges from 115
<br />to 130 days.
<br />In a representative profile the surface layer is red-
<br />dish brown loam about 9 inches thick. The subsoil is
<br />reddish brown heavy loam about 14 inches thick. Be-
<br />loty this is light reddish brown loran about 8 inches
<br />thick that is underlain by soft saudstmte and shale.
<br />Permeability is moderate, and the available water
<br />capacity is medium. Iteaction is mildly alkaline.
<br />These soils are used mainly for native grasses.
<br />Representative profile of I{irtley loam fu an area of
<br />Kirtley-Purser complex, 5 to 20 percent slopes, in
<br />native grass, 70 feet south of access road in sec. 19,
<br />T. 10 N., R. 70 W.:
<br />Al-0 to 9 inches; reddish brown (~iYR 5/:3)
<br />loam, dark reddish brown (GYR 3/3)
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<br />moist; moderate fine granular struc-
<br />ture; slightly hard, friable; mildly alka-
<br />line; abrupt smooth boundary.
<br />B21t-4~to 11 inches; reddish brown (2.5YR 4J3)
<br />heavy loam, dark reddish brown i2.5YR
<br />3/3) moist; moderate very fine subangu-
<br />lar blocky structure; hard, friable; thin
<br />neatly continuous clay films; mildly al-
<br />Italine; clear smooth boundary.
<br />B221r-11 to 18 incites; t•eddish brown (2.5YR
<br />G/9) heavy loam, dark reddish brown
<br />(5YR 3/4) moist; moderate fine pt'i5-
<br />matic structure parting to moderate me-
<br />dium subangular blocky; hard, friable;
<br />thin nearly continuous clay films;
<br />mildly alkaline; clear smooth boundary.
<br />Clca-18 to 26 inches; light reddish brown
<br />(2.5YR G/4) loam, reddish brown
<br />(2.5YR 4/4) moist; massive; ]tat•d, ft•i-
<br />able; visible calcium carbonate as seams
<br />and streaks; strongly effervescent; 25
<br />percent weathered red sandstone chan-
<br />ners; moderately alkaline; abrupt
<br />smooth boundary.
<br />C2r-26 to 60 inches; red sandstone.
<br />Thickness of the moHic epipedon ranges from 7 to
<br />15 inches. The A horizon is loam or fine sandy loam
<br />3 to 6 inches thick. The B ltot•izon is loam or light clay
<br />loam 9 to 20 inches thick. 1'he A and B hm•izons range
<br />from neutral to mildly alkaline. Content of rock frag-
<br />ments ranges from 0 to 15 percent in the A and B
<br />horizons.
<br />57-Kitdcy loam, 3. to 9 Petcent elo1~Ee._This gently
<br />slopmg m• s rongly Tmg s~ is on uplands and
<br />valleysides. Phis soil has a profile similar to the one
<br />described as representative of the series, but the com-
<br />bined thickness of the surface layer ,and subsoil is
<br />about 20 inches and depth to sandstone is about 30
<br />incites.
<br />Included with this soil in mapping are some small
<br />at•eas of outcrops a»d some small areas of soils in
<br />which sandstone fragments are in the profile. Also
<br />included are small areas of soils that ate more sloping
<br />or less sloping and small areas of Harlan and Purser
<br />soils.
<br />Runoff is medium to rapid, and the hazard of ero-
<br />sion is severe.
<br />This soil is well suited to pastm•e and native grasses
<br />under dryland management. It is less well suited to
<br />wheat and barley. If irrigated, it is suited to barley,
<br />wheat, and alfalfa. It is also suited to pasture. Capa-
<br />bility units IVe-1, irrigated, and IVe-3, dryland;
<br />Loamy foothill range site; not assigned to a wind-
<br />break suitability group.
<br />58-Kirtley-Yurncr cmnplex, 5 to 20 ~erccnt eloppes.
<br />This complex consists of strongly slopmg to moder-
<br />ately steep soils on uplands and valleysides. It is about
<br />45 percent Kirtley loam and about 40 percent Purser
<br />One sandy loam. Kirtley loam is smoother and less
<br />sloping, and Purser soil is steeper. The Kirtley soil
<br />has the profile described as reptesentative of the Kirt-
<br />ley series. The Purser soil has a pt•afile similar to the
<br />one described as representative of the Purser series.
<br />included with these soils in mapping are some small
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