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<br />This association makes up about 4 percent of the
<br />Area. It is about 65 percent Juget soils and about
<br />15 percent Rock land. Westereek and Garber soils
<br />and a moderately deep soil with a clay and clay
<br />loam subsoil make up the remaining 20 percent.
<br />Juget soils are in the.mountainous part of the
<br />Area. They are steep, very gravelly sandy ]oams and
<br />loamy sands that are shallow over granite bedrock.
<br />
<br />Rock outcrop is made up of barren cliffs of
<br />granite.
<br />Water erosion is a moderate io severe hazard in
<br />this association. Soil slippage is common. Gullies
<br />form easily.
<br />This association is not suited to cultivation.
<br />It is used for grazing livestock, wildlife habitat,
<br />recreation, Christmas trees, and lumber for fence
<br />poles.
<br />DESCRIPTIONS OF THE SOILS
<br />This section describes the soil series and map-
<br />ping units in the Castle Rock Area. Each soil se-
<br />ries is described in considerable detail, and then,
<br />briefly, each mapping unit in that series. Unless
<br />it is specifically mentioned othen+ise, it is to be
<br />assumed that what is stated about the soil series
<br />holds true for the mapping units in that series,
<br />Thus, to get full information about any one mapping
<br />unit, it is necessary to read both the description
<br />of the mapping unit and the description of the soil
<br />series to which it belongs.
<br />An important part of the description of each soil
<br />series is the soil profile, that is, the sequence of
<br />layers from the surface downward to rock or other
<br />underlying material. Each series contains two de-
<br />scriptions of this profile. The first is brief and
<br />in terms familiar to the layman. The second, de-
<br />tailed and in technical terms, is for scientists,
<br />engineers, and others who need to make thorough and
<br />precise studies of soils. Unless it is othen+ise
<br />stated, the colors given in the descriptions are
<br />those of a dry soil.
<br />As mentioned in the section '41ow This Survey lias
<br />f•lade", not all mapping units are of a soil series.
<br />Rock land, for example, does not belong to a soil
<br />series, but nevertheless, is listed in alphabetic
<br />order along with the soil series.
<br />Following the name of each mapping unit is a
<br />symbol in parentheses. This symbol identifies the
<br />mapping unit on the detailed soil map. Listed at
<br />the end of each description of a mapping unit is the
<br />capability unit and range site in which the mapping
<br />unit has been placed. The page for the description
<br />of each capability unit and range site can be found
<br />by referring to the "Guide io Mapping Units" at the
<br />back of this survey.
<br />The acreage and proportionate extent of each
<br />mapping unit are shown in table 1. Flany of the terms
<br />used in describing soils can be found in the Glos-
<br />sary at the end of this survey, and more detailed
<br />information about the terminology and methods of
<br />soil mapping can be obtained from the Soil Survey
<br />l/
<br />~Undersco red numbers in parentheses refer to
<br />Li teraturc Cited, p. 121.
<br />EXHIBIT "D" - Wildlife, Water
<br />Resources, Vegetation and Soil Information
<br />Page 4
<br />Blakeland Series
<br />The Blakeland series consists of well-drained
<br />soils that formed in sand deposited by wind and
<br />water on uplands and alluvial fans. These soils are
<br />mostly on the east side of major drainageways in the
<br />northern part of the Area. Slopes are 1 to 15
<br />percent. The vegetation is mainly tall grasses.
<br />Elevations are 5,500 to 6,600 feet. Annual precip-
<br />itation is 15 to 19 inches. Mean annual soil tem-
<br />perature is 47° to SO° F., and the frost-free sea-
<br />son is 120 to 135 days.
<br />In a representative profile, the surface layer
<br />is dark grayish-brown light sandy loam about 13
<br />inches thick. The next layer is brown loamy coarse
<br />sand about 11 inches thick. The underlying material
<br />is stratified light yellowish-brown coarse loamy
<br />sand to sand. In plates, hard arkosic shale is be-
<br />low a depth of 40 inches.
<br />Blakeland soils have rapid permeability. Avail-
<br />able water capacity is low. Roots can penetrate to
<br />a depth of 40 inches or more.
<br />f•bst areas of Blakeland soils are in native
<br />grasses and are used for grating cattle and horses.
<br />Some areas are irrigated, and others are dryfarmed,
<br />although the soils are droughty. These soils ere
<br />suited to urban development.
<br />Representative profile of Blakeland sandy loam,
<br />in native pasture half a mile south and 300 feet east
<br />of the northwest corner of sec. 7, T. 8 S., R. 65
<br />W.:
<br />All--O to 6 inches, dark grayish-brown (lOYR 4/2)
<br />light sandy loam, very dark brown (lOYR 2/2)
<br />when moist; weak, fine, granular structure;
<br />slightly hard, very friable; pH 6.8; clear,
<br />smooth boundary.
<br />A12--6 to 13 inches, dark grayish-brown (IOYR 4/2)
<br />light sandy loam, very dark grayish brown (]OYR
<br />3/2) when moist; weak, medium to coarse, sub-
<br />angular blocky structure; hard, very friable;
<br />All 6.8; clear, wavy boundary.
<br />AC--13 to 24 inches, brawn (lOYR 5/3) loamy coarse
<br />sand, dark grayish brown (lOYR 4/?) when
<br />moist; weak, coarse, prismatic st~vcture
<br />parting co weak, coarse, subangu lar blocky;
<br />very hard, very friable; All 6.R; gradual,
<br />smooth boundary.
<br />C--24 [0 60 inches, light yellowish-brown (2.5Y 6/3)
<br />stratified coarse loamy sand to sand, light
<br />5
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