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~ ~g <br />~-nv~xcE core' m <br />Duffey Series <br />Depth class: Moderately deep <br />Drainage class: well drained <br />Parent material: Colluvium, residuum from granite <br />Landscape position: Mountainsides <br />Slope: 5 to 50 percent <br />Average annual precipitation: 15 to 20 inches <br />Average annual air temperature: 38 to 42 degrees F <br />Taxonomic class: Loamy-skeletal, mixed Typic Cryoboralfs <br />Typical Pedon <br />Duffey very gravelly coarse sandy loam in an area of Duffey-Raleigh <br />complex, 5 to 50 percent slopes, about 1,050 feet east and 1,200 <br />feet north of the southwest corner of Sec. 29, T. 13 S., R. 70 <br />W. <br />Oe=1 to 0 inch; intermediately decomposed fir litter. <br />E1=0 to 7 inches; pale brown (lOYR 6/3) very gravelly coarse sandy <br />loam, brown (lOYR 4/3) moist; weak very fine subangular blocky <br />structure; soft, very friable, slightly sticky, and slightly plastic; <br />55 percent gravel; neutral; clear smooth boundary. <br />E2=7 to 12 inches; pale brown (lOYR 6/3) very gravelly sandy loam, <br />brown to dark brown (lOYR 4/3) moist; weak fine subangular blocky <br />structure; soft, very friable, nonsticky, and nonplastic; 35 percent <br />gravel; neutral; clear smooth boundary. <br />Bt=12 to 26 inches; brown (7.5YR 5/4) very gravelly sandy clay <br />loam, strong brown (7.5YR 4/6) moist; weak medium prismatic structure, <br />parting to moderate medium subangular blocky; common distinct clay <br />films on faces of peds and in pores; 50 percent gravel; neutral; <br />abrupt wavy boundary. <br />Cr=26 inches; partially decomposed granite. <br />R=41 inches; granite <br />Range in Characteristics <br />Thickness of the solum: 20 to 40 inches <br />Depth to bedrock: 20 to 40 inches <br />Content of gravel in the E and Bt horizons: 35 to 85 percent <br />Hue: lOYR or 7.5YR <br />Reaction: strongly acid to neutral <br />Gravel is dominantly subangular pebbles (grus) 2mm to 1/2-inch in <br />diameter <br />A horizon: <br />Texture=very gravelly coarse sandy loam, very gravelly sandy loam <br />Bt horizon: <br />Texture=fine-earth fraction is sandy clay loam, sandy loam, clay <br />loam <br />C horizon: <br />Reaction=moderately acid to neutral <br />Texture=fine-earth fraction is sandy loam, coarse sandy loam, loamy <br />coarse sand <br />