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BOIILDER CO[IVTY AREA, COLORADO ~ ?'7 <br />Blt-1 Co .inches, brown (lOYR 5/8) clay loam, dark brown <br />(lOYR 3/3) when moist; weak, medium, prismatic <br />structure that pa r[s to moderate. medium, subangu- <br />Wr blocky: hard. friable; Pew thin c1aS Hlms on <br />vertical Paces oC some age ega[es: 10 percent gavel; <br />neutral: clear, smooth boundarc. <br />B2t-. to ^_U inches, brown (lUYR 5/8) light clay, dark brown <br />(lOTR i/3) when moist; moderate. medium, pris- <br />matic structure that ports to moderate, medium. <br />angular blocky; extremely hard, firm: thin continu- <br />ous c1aS films on Paces nC aggregates: 30 percent <br />gravel; mildlS alkaline; clear, wavy bnnndary. <br />Baca-_0 to o{ inches, light-brown (7aYR 6/8) gravelly clay <br />loam, brow^ (;.~Y'R i/31 when moist; weak. me- <br />dium. prismatic structure that ports to moderate, me- <br />dium, subangular blocl:S; very hard. 8rm; commov. <br />fhin cloy films nn faces nP aggregates; 15 percent <br />aveL calcareous, with few to common, fine to me- <br />dium. white IlOTR S%') lime seams and streak: <br />modes [eIS alkaline: grnduah woos Iwundarc. <br />IICir.-°_4 to 35 inches, pinkish-white (7.SYR 9/.) very <br />6rwelly loam, pink (7.SYR SN) when moist: mas- <br />sive: verS haul, verS fnable:.i0 percent gravel and <br />cobblestones; calca renns with many fine and few <br />medium, white 110YR 9/?1, soft segregations of <br />lime: mnderu[ely alkaline; gradual, wars boundary. <br />IIC^_ca-=;5 [0 60 inches. light-brown fTbTR 6/81 very gravel <br />'c Inam, hrown (7.SYR v/8) moist: massive: hard. <br />'ery Criahle; 50 to i5 Percent „ravel and rnbble- <br />-ones calca renus with mans, fine and medium. <br />'~'~Ite (lOYR 9/.) soft segrega Lions and ha tti cna[- <br />ics oP lime nn under sides of rock fragments: mal- <br />er.rely alkaline. <br />The Al horizon runges Prom i to L^ inches in thickness and <br />from loam to clay loam in texture. Texture of the B_[ horizon <br />rm~es Prom n heavy claS loam to clot that may be gracellS <br />or cobbly. Depth [o calcareous material runiles from S [o ?0 <br />inches. DePtl~ to underlSinR cobblestones acid gravel ranges <br />from '_II to dU inches. Content oP cobblestones and gravel in <br />the A and B horizons ^ormallc ranges from .-~ to 30 percent. <br />but it may be as high as SU percent in the surface lacer oC <br />cobblS Phases. In the C horizon. the content oC cobblestones <br />and grovel ranges from 50 to .0 percent. <br />Valmont clay loam, 1 to 3 percent slopes IVoBI.-This <br />soil is on terraces and fans mainly- in the central part <br />of the area. In most places it occurs as areas more than <br />-FO acres in size. <br />The profile of this soil is much like the one described <br />as rcpresentatice for the series. but the surface lacer is <br />about ~ inches of ciao loam. The subsoil is about 6 <br />inches of clay that gisdes- into limy clay :.oam about 14 <br />inches thick. <br />Included with this soil in mapping ;irr, a fete areas <br />that hate a soasnnal high water table. _llso included are <br />small areas of Galmont cobbh- clot loam. 1 to 5 percent <br />slopes::mti Vann clay loam. 1 to •", percent slopes. These <br />included soils make up about 15 percent. of each mapped <br />area. <br />Pnnoff is medium on this soil. The erosion hazard is <br />moderate. I'ertlity is medium. <br />lost of the ncrcage of this soil is used for irrigated <br />and dtyland crops and for pasture. (Capabilitc units <br />Figure 1.-Outwash fans and terraces with Terrace escarpments in the foreground and in the sloping areas. <br />