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BOD'LDER COIINTY AREA, COLORADO
<br />B,tA-29 to 60 (aches, yellowish-brown (lOYR 5/4) stony clay
<br />loam In y.- to 2-inch tLlck discontinuous lamellae;
<br />- these lamellae are dark yellowish brow^ (lOYR 4/4)
<br />when moist, end Snteispersed between them is light
<br />brownish-gray (lOYR 4/2) heavy sandy loam mate-
<br />- rial like that of the horizon above; dark grayish
<br />- brown (lOYR 4/2) when moist; lamellae Lave mod-
<br />= crate, medium, subangular blocky structure, sad fa-
<br />~~~ terspersed materiel is massive; lamellae are very
<br />hard and frtable and interspersed material Is slightly
<br />_~ hard and very hlable; lamellae have thin, continuous
<br />clay films oa pad faces; this horizon 1s 20 percent
<br />atone; slightly aMd; gradual, wavy boundary.
<br />C-60 to 80 Snches, light yellowish-brown (25Y 8/3) very
<br />stony sandy loam, light olive brown (2.5Y 5/3) when
<br />moist; massive; slightly Lard, very friable; 60 per-
<br />cent atone; slightly acid.
<br />The Al Lorizon ranges from 0 to 4 inches In thickness, sad
<br />Sa some places St 1s absent. The A2 horizon ranges from loamy
<br />. sand to sandy loam In texture. Content of coarse fragments
<br />ranges Crom 5 to 35 percent throughout the solum, but reaches
<br />as hlgh~ as 80 or 70 percent la the C horizon. Aepth to bedrock
<br />is e0lnches or more.
<br />F4ernsGlifE~lilensi~ark=Rock-outcrop4eo~m,~le~-~15; tq;
<br />60~pe[ce~ttirlopes~(FcFI.-Thiss comp7es is-ma3e up of
<br />about 30 percent Fern Cliff stony sandy loam, about 30
<br />percent Aliens Park gravelly sandy loam, and about 20
<br />percent Rock outcrop. This complex is in the western 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 nd~es.
<br />Included with this complex In mapping are minor areas
<br />of Fern Cliff stony loamy sand, Juget soils, 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 complex. The
<br />erosion hazard is high.
<br />All of the acreage of this complex is woodland. Timber
<br />cutting is sonlewhnt limited by rho steep slope and the
<br />slow growth of trees. Some areas are used for grazing.
<br />1lfany 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. These soils formed on uplands 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. Mean annu¢1 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 1,550 feet south and 1,050 feet
<br />east of the northwest corner of sec. 23, T. 2 N., R. 69 '4V.:
<br />Al--0 to 6 inches, light olir•e-brow^ (2.5Y 5/3) heavy silty
<br />clay loam, olive brown (2.5Y 4/3) when moist;
<br />strong, one, granular structure; soft, very friable;
<br />calcareous; moderately elkauae; clear, smooth
<br />boundary.
<br />ACS to 10 inches, light olivebrown (2.5Y 5/3} heavy silty
<br />clay loam, olive brown (2.5Y 4/3) when moist; week,
<br />medium, subaagular blocky structure; extremely
<br />Lard, drm; calcareous; moderately alkaline; gradual,
<br />smooth boundary.
<br />Clca-10 to 30 inches, light yellowish-brawn (25Y 8/3) Leavy
<br />aDty clay loam, light olive brown (2.5Y 5/3) when
<br />moist; massfve; very Lard, Hrm, plesttc; calcareous
<br />with some discontinuous accumulation of sernndary
<br />calcium carbonate end calcium sulfate ae soft segre-
<br />ga[loas and crystals; moderately alkaline; gradual,
<br />wavy boundary.
<br />IIC2~0 to 80lnches, soft. calcareous silty shale.
<br />The A horizon ranges from 4 to 8 Inches 1n thickness. TLe
<br />C horizon ranges from silty clay loam to clay In texture.
<br />Depth to underlying shale or sandstone ranges from 20 to 40
<br />Inches.
<br />Gaynor silty clay Ioam, I to 3 percent slopes fGoBi.-
<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 ~vitll this soil in mapping are small areas of
<br />Samsil 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 rnclusions malre 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 IVs-1, irrigated, and
<br />IVe-1, nollirngated; tree suitability group 3)
<br />Gaynor silty clay loam, 3 to 9 percent slopes IGoDi.-
<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 />Samsil cloy, 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 n 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 water 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 for pasture. A few small areas are used
<br />for dryland crops. (Capability units I4e-1, irrigated, and
<br />VI~1, nonirrigated; tree suitability group 3)
<br />Goldvale Series
<br />The Goldvale series is mado 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-#ree
<br />season is about 100 to 120 days.
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