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BOULDER COUVTY AREA, COLORADO 2T Blt-I to ;inches, brown (lOYR 5/3) clay loam. dark brown (lOYR 3/3) when moist; weak, medium, prisms Uc structure that Parts [o moderate, medium, suhangu- lar blocky; hard. friable; tew thin clay films on vertical faces of some age egates; lU percent gravel; neutral :clear, smootlr boundary. B2t-; to ^U inches, brown (lUFR 5/3r light clay, dark brown (lOYR -k/3) when moist; moderate. medium, pris- matic SCCUMLLre Utn[ parts CD moderate. medium, angular blocky; extremely hard, firm; thin con[inu• ous clay alms on faces rap aggree [es; lU percent 4ravel; mildly alkaline; clear, wacy bnnndary. Baca-?0 [o ^_} inches, light-brown (;.SYR 6/8) gravelly else [oam, brown (;.SYR 5/3) when moist: n•eak, me- dium, prisma[1c structure that ports to moderate, me• diem, subangular blocky; vary hard. 8rm; common, thin clay films on Paces np aggregates; ]5 percent grarel: calcareous, with fea' to camman, floe to me- dium, white (lOYR 8/^_) lime seams and streak: moderately alkaline: gradual, wary !>,~undarp. IICl.:-_t ur 35 inches, pinkish-white (;.SYR S/_) verc gravell3' loam, Pink (7SYR R/.}~ when moist: mas- sive: very hard, very friable; 30 percent gravel and cobblesrones: calcareous with many One and Pew medium, white (lOYR 9/?), soft segregations o[ lime; moderately alkaline; gradual wavy lHmndarp. ILC^_ca--:5 [n 60 inches, light-brown fTSYR 6/8) verc grarel- ~~ ion m, brown (;.SYR 5/3) moist: massive; hard. ..„rp friable: 50 to 75 percent gravel and rnbble- -nnes calcareous with many. fine and medium. ^~hite (lOYR .4/?) soft segrega tints and hard cool irs nP lime nn under sides of rock Pngments; mod- erately alkaline. The Al horizon ranges from d to L" inches in thickness and Prom loam to clap loam in texnrre. Tecture ut the 8.[ horizon ranges from n heavy else loam to else Char map be gravelly ar cobble Depth to calcareous material rahges from S Co ?0 inches. Depth to underlying cvbblea7nnes and grarel ranges Prom 7U w dU inches. Content oP cobblestones and ^racel in [he A and B horizons normally ranges Prom v to 30 percent. but it may be as high as 5U percent in the surface lacer op cobbly phasb. In the C horizon. [he con[eut oP cobblestones and gravel ranges from 50 to .0 percent. Valmont clay loam, 1 to 3 percent slo);~es fVoel.-This soil is on terraces and fans mainly in the central .part of the area. In most places it occurs ns areas more than 40 acres in site. The profile of this soil is much like thy: one described as representaticp for the series, but the surface lacer is .>-bout 9 inches of cloy loam. The subsoil is abort 6 inches of clay that grades into ]imp else ]oam about 14 inches thick.- Included rcith this soil in mapping arc a fett• areas that ha~'e a srason:ll hicl] water table.:~ls;a included are small areas of Valmont cobbl}• else loam. I to 5 percent slopes: and Vann clay loam. 1 to :percent slopes. These inchltictl soils make rap about 15 percent of each mapped aI~E. Pnnoft is medium on this soil. The erasion hazard is modcrntc. hertlity is medium. Jost of the acreage of this soil is used for irrigated and dryland crops and for pasture. (Chpability units • •a-~= ..-vu~wasn rans anq terraces with Terrace escarpments in the foreground and in the sloping areas.