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<br />BOIILDER CODNTY AREA, COLORADO
<br />B&A-29 to 80 (aches, yellowish-brown (lOYR 5/4) stony clay
<br />loam in ~- to 2-inch thfclc discontinuous lamellae;
<br />these lamellae are dark yellowish brown (lOYR 4/4)
<br />when moist, and faterspersed between them is light
<br />brownish-gray (lOYR 4/?) heavy sandy loam mate-
<br />rial like [hat of the horizon above; dark grayish
<br />brown (lOYR 4/2) when moist; lamellae have mod-
<br />erate, medium, subangular blocky structure, end in-
<br />terspersed material 1s massfve; lamellae are very
<br />hard sad friable and interspersed material Is slightly
<br />hard and very friable; lamellae have thin, rnntinuous
<br />clay 81ms oa pad faces; this horizon is 20 percent
<br />stone; slightly acid; gradual, wavy bouada ry.
<br />C-~0 to 80 !aches, light yellowlsh•brown (25Y 8/3) very
<br />stony sandy loam, Ilght olive brown (2.5Y 5/3) when
<br />molat; massive; slightly herd, very friable; 60 per-
<br />cent stone; slightly acid.
<br />The Al hortzon ranges from 0 to 4 Snches in thlcl-ness, and
<br />In some places It Ss absent. The A2 horizon ranges from loamy
<br />~saad to sandy loam In texture. Content of coarse fragments
<br />ranges from 5 to 35 percent throughout [he solum, but reaches
<br />as hlgh~ as !i0 or 70 percent In the C horizon. Depth to bedrock
<br />Is 80 (aches or more.
<br />F~ernioliff;~111ensi~ar_mock^outcr~,kco~m~les~~,~16;,ty;
<br />60~,pe;celfttl~lopes (FcF).-Thiss c~ om`p7es is ma3e up of
<br />about 30 accent Fern Cliff stony sandy loam, about 30
<br />percent Aliens Park gravelly sandy loam, and about 20
<br />percent Rook outcrop. This complex is in the westein part
<br />of the Area. _
<br />Fern Cliff soils are on mountain side slopes and short
<br />fans. Aliens Park soils are on ridges and side slopes, and
<br />on saddles between the ridges. Rock outcrop is through-,
<br />out the Area, but mainly on rides.
<br />Included with this complex rn mapping are minor areas
<br />of Fern Cliff stony loamy sand, Juget sails, Peyton soils,
<br />and narrow bands of alluvial soils along drainngeways.
<br />These included soils make up about 20 percent of each
<br />mapped area.
<br />Runoff is medium to rapid on areas of this comples. The
<br />erosion hazard is high.
<br />Al] of the acreage of this comples is woodland. Timber
<br />cutting is soniewhnt limited by rile steep slope and the
<br />slow growth of trees. Some areas are used for grazing.
<br />Many areas are now used as sites for cabins and homes,
<br />and for recreational uses and wildlife habitat. (Capability
<br />unit VIIe-1, nonirrigated; tree suitability group 1)
<br />Gaynor Series
<br />The Gaynor series is made up of moderately deep, well-
<br />drained soils. Thest soils formed on uplarids in loamy
<br />alluvium and wind-laid materials. Slopes are 1 to 9 per-
<br />cent. Elevations are 4,900 to 5,500 feet. The native vege-
<br />tation is mainly short grasses. Annual precipitation is 12
<br />to 18 inches. bfean annual air temperature is 48° to 52° F.,
<br />and the frost-free season is about 140 to 155 days.
<br />In a representative profile the surface layer is light
<br />olive-brown silty clay loam about 6 inches thick. Below
<br />this is light olive-brown silty clay loam about 4 inches
<br />thick. The underlying material is light yellowish-brown
<br />silty clay loam about 20 inches thick. Underlying this is
<br />soft calcareous silty shale. Soil reaction is moderately
<br />alkaline.
<br />Gaynor soils have moderately slow permeability. Avail-
<br />able water capacity for the profile is moderate. Roots
<br />can penetrate to a depth of between 20 and 40 inches.
<br />II
<br />These soils are used for irrigated and dryland crops
<br />and for pasture.
<br />Representative profile of Gaynor silty clay loam, 1 to
<br />3 percent slopes, located 1,S50 feet south and 1,050 feet
<br />east of the northwest corner of sec. 23, T. 2 N., R. 69 tiP.:
<br />Alm to 6 !aches, tight olive-brown (?.SY 5/3) heavy silty
<br />clay loam, olive brown (?.SY 9/3) whew moist;
<br />strong, one, granular structure; soft, very friable;
<br />calcareous; moderately alkaline; clear, smooth
<br />boundary.
<br />AC-8 to 10 Inches, light olive-brown (2.5Y 5/3) heavy sllty
<br />clay loam, olive brown (2.5Y 4/3) when molat; weak,
<br />median[, subangular blocky structure; extremely
<br />hard, Hrm; calcareous; moderately alkaline; gradual,
<br />smooth boundary.
<br />Cica-10 to 301aches, light yellowish-brown (25Y 8/3) heavy
<br />sLLty clay loam, light olive brown (2.5Y 5/3) when
<br />mots[; massive; very hard, Ilrm, plastlc; calcareous
<br />with some discontinuous accumulatlon of secondary
<br />calcium carbonate sad calcium sulfate ae soft segre~
<br />gatioas end crystals; moderately alkaline; gradual,
<br />wavy boundary.
<br />IIC2~0 W 60 lathes, soft, calcareous silty shale.
<br />The A horizon ranges from 4 to 8 inches in thickness. The
<br />C horizon ranges from silty clay loam to clay la texture.
<br />Depth to underlying shale or saudstoae ranges Lrom 20 to 90
<br />!aches.
<br />Gaynor silty clay loam, 1 to 3 percent slopes IGoel.-
<br />This soil is mainly in the northeastern part of the Area.
<br />In most places it occurs as areas more than 6 acres in size.
<br />This soil has the profile described as representative for the
<br />series.
<br />Included ivitli this soil in mapping are small areas of
<br />Semsil clay, 3 to 12 percent slopes; Colby silty clay loam,
<br />1 to 3 percent slopes; and Gaynor silty clay loam, 3 to 9
<br />percent slopes. These inclusions make up about 15 percent
<br />of each mapped area.
<br />Runoff is medium on this soil. The erosion hazard is
<br />slight to moderate.
<br />All of the acreage of this soil is used for irrigated and
<br />dryland crops. (Capability units IPs-1, irrigated, and
<br />IVe-l, noliirrlgnted; tree suitability group 3)
<br />Gaynor silty clay loam, 3 to 9 percent slopes (GaDI.-
<br />This soil is in the northeastern part of the Area. In most
<br />places it occurs as areas more than 20 acres in size.
<br />Included with this soil in mapping are small areas of
<br />Semsil clay, 3 to 12 percent slopes; Colby silty clay loam,
<br />5 to 9 percent slopes; and Renohill silty clay loam, 3 to 9.
<br />percent slopes. Also included are a few small areas that
<br />have gravel spots. These included soils make up about 20
<br />percent of each mapped area.
<br />Runoff is rapid on this soil. The hazard of ivatar ero-
<br />sion and soil blowing is high.
<br />Almost all of the acreage of this soil is used for irri-
<br />gated crops and fat pasture. A few small areas are used
<br />for dryland crops. (Capability units IVe-1, irrigated, and
<br />VIe-1, nonirrigated; tree suitability group 3)
<br />Goldvale Series
<br />The Goldvale series is made up of deep, well-drained
<br />soils that formed on mountainsides in loamy alluvium.
<br />Slopes are 9 to 55 percent. Elevations are 5,900 to 6,700
<br />feet. The native vegetation is mainly ponderosa pine and
<br />Douglas-fir. Annual precipitation is 18 to 22 inches. Mean
<br />annual air temperature is 43° to 47° F., and the frost-free
<br />season is about 100 to 120 days.
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