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Yampa Series (12) The Yampa series is a mamber of the fine loamy, mixed family of • Typic Haplaguolls. Typical Pedon• All 0- 4"--Dark gray (lOYR 4/1) silt loam, very dark gray (lOYR 3/1) when moist; moderate Eine granular and crumb struc- ture; soft when dry, very friable when moist; common numbers of medium sized faint 2.5Y 3/2 mottles; noncal- careous, pH 7.8; clear smooth boundary. A12 4- 9"---Grayish broom (2.SY 5/2) silt loam, very dark grayish brown (2.SY 3/2) when moist; weak to moderate, medium sub- angular blocky structure breaking to moderate, medium granules; slightly hard dry, very friable moist; many medium sized distinct IOYR 3/4 mottles; approximately 2 percent gravel; noncalcareous, pH 7.0; gradual wavy bound- ary. • B21g 9-15"--Gray (2.SY 5/I) light clay loam, dark gray (2.SY 3/1) when moist; moderate, fine subangular blocky structure; the horizon is slightly hard dry, very friable moist, but individual aggregates are very hard when dry; there are many large distinct 2.SY 4/4 mottles; noncalcareous, pH 7.2; gradual wavy boundary. B22g 15-21"--Gray (2.SY 6/1) light clay loam, dark gray (2.SY 4/1) when moist; weak, fine subangular blocky structure; the horizon is slightly hard dry, very friable moist, but individual aggregates are very hard dry; there are many large distinct 2.SY 5/6 and 4/4 mottles; noncalcareous, pH 7.0; clear wavy boundary. C , J