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<br />Runoff is rapid. In most places the erosion haz-
<br />ard is moderate, but in cultivated areas the erosion
<br />hazard is high. Gullies have formed in drainage-
<br />ways where these soil are cultivated. Rills are
<br />common after moderate amounts of rainfall. Shale is
<br />exposed in some areas [hat are severely eroded.
<br />Most areas of these soils are in native grass and
<br />are used for grazing livestock. A few areas are
<br />cultivated. (Capability unit VIe-1; Clayey Foothill
<br />range site)
<br />Renohill Series, Reddish Variant
<br />The Renohill series, reddish variant, consists of
<br />well-drained soils that formed in material weathered
<br />from noncalcareous red shale. These sloping to mod-
<br />erately steep soils are on uplands. Slopes are 5 to
<br />20 percent. The vegetation is mid and tall grasses.
<br />Elevations are 5,700 to 6,200 feet. Annual precipi-
<br />tation is 15 to 17 inches. Mean annual soil temper-
<br />ature is 49° to S1° F., and the frost-free season is
<br />120 to 135 days.
<br />In a representative profile the surface layer is
<br />dark-brown sandy loam about 8 inches thick. The sub-
<br />soil is reddish-brown and weak-red clav about 24
<br />inches thick. Weak-red, soft sands [one and shale
<br />are at a depth of about 32 inches.
<br />These soils have slow permeability and moderate
<br />available water capacity. PLants can penetrate to
<br />a depth of 20 to 40 inches.
<br />Most areas of these soils are in native grasses
<br />and are used for grazing livestock. These soils
<br />are a source of clay material used in manufacturing
<br />brick and tile, and clay pits are common.
<br />Representative profile of a Renohill sandy loam,
<br />reddish variant, 500 feet south and 100 feet west of
<br />the northeast corner of sec. 27, T. 6 S., R. 66 W.:
<br />Al--0 to 8 inches, dark-brown (7. SYR 4/4) sandy
<br />loam, dark brown (7. SYR 3/3) when moist;
<br />weak, medium, sub angular blocky structure;
<br />slightly hard, friable; neutral (pH 6.8);
<br />clear, smooth boundary.
<br />821t--8 to 18 inches, reddish-brown (SYR 4/4) clay,
<br />reddish brown (SYR 4/4) when moist; moderate,
<br />medium, prismatic structure parting [o strong,
<br />medium, angular blocky; very hard, firm;
<br />nearly continuous clay films on horizontal and
<br />vertical faces of peds; neutral (pH 6.8);
<br />clear, smooth boundary.
<br />B22t--18 to 32 inches, weak-red (lOR 4/3) clay, weak
<br />red (lOR 4/3) when moist; weak, medium, pris-
<br />matic structure parting to moderate and strong,
<br />medium, angular blocky; hard, firm; thin
<br />patchy clay films on vertical faces of peds;
<br />neutral (pH 7.0); gradual, smooth boundary.
<br />R--32 to 46 inches, weak-red (lOR 4/3), weathered,
<br />noncalcareous shale.
<br />The A horizon ranges from S to 10 inches in thick-
<br />ness and from loam to sandy loam in texture. The B
<br />horizon ranges from S to 30 inches in thickness and
<br />from heavy clay loam to clay or silty clay in tex-
<br />ture. Weathered shale and sandstone are at a depth
<br />of 20 to 40 inches.
<br />Renohill sandy loam, reddish variant, 5 to 20 oer-
<br />cent slopes (Ro E:).--This sloping to moderately steep
<br />soil is on uplands in the northern part of the Area.
<br />Most mapped areas are less than 40 acres. They are
<br />long, narrow bands at an elevation of about 6,000
<br />feet.
<br />Included with this soil in mapping are areas of
<br />Newlin gravelly son dy loam, 8 to 30 percent slopes,
<br />and Satanta loam.
<br />Runoff is- medium to rapid. The erosion hazard is
<br />moderate.
<br />Most areas of this soil are in native grass and
<br />are used for gracing livestock. This is a source
<br />area of clay for the manufacturing of brick and the
<br />in the Denver area. (Capability unit VIe-1; Sandy
<br />Foothill range site)
<br />Rock Land
<br />Rock land-Lonetree complex, 30 to 100 percent
<br />slopes (RtG), is an intricate intermingling of
<br />about 40 percent Rock land and about 25 percent
<br />Lonetree loamy sand. This moderately steep to very
<br />steep complex is on hogback areas in the western
<br />pact of the Area along the front range. Rock land
<br />consists of a ver~~ shallow soil and rock outcrops of
<br />red sandstone that in many areas stand as monuments
<br />and sentinels.
<br />The Lonetree soil has a profile similar to that
<br />described as representative for the series, but it
<br />is a gravelly son d~- loam. Red sandstone or shale is
<br />between depths of 40 and 60 inches. The north-
<br />facing slopes have a darker colored surface layer
<br />than the south-facing slopes.
<br />Included with these areas in mapping are small
<br />areas of Garber gravelly sandy loam, 5 to 30 percent
<br />slopes, Tinytown soils, and a few small areas of
<br />pink and red limestone. Taken togethe r, these areas
<br />make up 35 percent of each mapped area.
<br />Runoff is rapid. The erosion hazard is moderate,
<br />and soil slippage is common.
<br />Most areas of this complex are covered with brush.
<br />In most places mountain-mahogany is on south-facing
<br />slopes and Cambel oak is on north-facing slopes.
<br />Some mid and tall grasses are present. Grazing is
<br />limited. This complex is well suited to wildlife
<br />habitat and recreation. (Both parts of complex:
<br />capability unit Viie-1. Lonetree soils: Shallow
<br />Foothill range site; Rock land not placed in a range
<br />site)
<br />Sampson Series
<br />The Sampson series consists of well-drained
<br />soils [hat formed in alluvium derived from weath-
<br />ered, ark osic, sedimentary rock. These gently
<br />sloping soils are on stream terraces and alluvial
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