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Luhon series <br />The Luhon series consists of deep, well drained soils <br />that formed in mixed alluvium. Luhon soils are on alluvial <br />fans and terraces. Slopes are 1 to 9 percent. Mean <br />annual precipitation is about 10 inches, and the mean <br />annual air temperature is about 41 degrees F. <br />Luhon soils are near the Cumbres, McGinty, Garita, <br />Monte, Stunner, and Travelers soils. Cumbres soils have <br />a B2t horizon and are more than 35 percent coarse <br />fragments. McGinty soils are coarse-loamy. Garita soils <br />are more than 35 percent gravel and cobbles throughout <br />the profile. Monte soils have no concentrated zone of <br />secondary calcium carbonate accumulation. Stunner <br />soils have a clay loam 82t horizon. Travelers soils have <br />bedrock at depths of leas than 20 Inches, and are more <br />than 35 percent coarse fragments. <br />Typical pedon of Luhon loam, 3 to 9 percent slopes, in <br />SE1 /4SW 1 /4 sec. 1, T. 34 N., R. 7 E.: <br />A1-0 to 8 inches; pinkish gray (7.5YR 6/2) loam, dark <br />brown (7.5YR 4/2) moist; moderate fine granular <br />structure; soft, very friable; few pebbles and cob- <br />bles; calcareous; moderately alkaline; clear wavy <br />boundary. <br />C1ca -8 to 20 inches; light yellowish brown (10YR 6/4) <br />gravelly loam, dark yellowish brown (10YR 4/4) <br />moist; massive; slightly hard, friable; 15 percent <br />gravel and 5 percent cobbles; calcareous, with cal- <br />cium carbonate visible as finely divided marl-like <br />forms; moderately alkaline; clear wavy boundary. <br />C2ca -20 to 60 inches; pink (7.5YR 7/4) loam, brown <br />(7.5YR 5/4) moist; massive; slightly hard, friable; 10 <br />percent gravel and cobbles; calcareous; calcium car- <br />bonate visible in finely divided forms, but less than <br />in the layer above; moderately alkaline. <br />Content of rock fragments ranges from 0 to 35 per- <br />cent. Depth to calcareous material ranges from 0 to 5 <br />inches. Depth to the calcic horizon ranges from 5 to 35 <br />inches. <br />Shawa series <br />The Shawa series consists of deep, well drained or <br />moderately well drained soils that formed in alluvium <br />derived primarily from latite, rhyolite, and breccia (fig. <br />15). Shawa soils are on alluvial fans and terraces. <br />Slopes are 0 to 5 percent. Mean annual precipitation is <br />about 14 inches, and the mean annual air temperature is <br />about 41 degrees F. <br />Shawa soils are near the Dunul soils. Dunul soils are <br />over 35 percent gravel throughout the profile and are <br />less than 20 inches thick over sand and gravel. <br />Typical pedon of Shawa loam, 0 to 1 percent slopes, <br />about 1,600 feet south and 2,550 feet east of the west <br />quarter comer of sec. 23, T. 32 N., R. 8 E.: <br />AP-0 to 4 inches; dark grayish brown (10YR 4/2) loam, <br />very dark grayish brown (10YR 3/2) moist; weak fine <br />subangular blocky structure parting to moderate fine <br />granular; slightly hard, friable; calcareous; mildly al- <br />kaline; gradual smooth boundary. <br />A11-4 to 15 inches; dark grayish brown (10YR 4/2) <br />clay loam, very dark grayish brown (10YR 3/2) <br />moist; moderate fine subangular blocky structure; <br />slightly hard, friable; mildly alkaline; gradual smooth <br />boundary. <br />Al2 -15 to 24 inches; brown (10YR 5/3) loam, dark <br />brown (10YR 3/3) moist; weak fine subangular <br />blocky structure parting to weak fine granular; hard, <br />friable; mildly alkaline; gradual smooth boundary. <br />C -24 to 60 inches; pale brown (10YR 6/3) loam, dark <br />brown (10YR 4/3) moist; weak medium and fine <br />granular structure in the upper part and massive <br />below; hard, friable; thin sand strata; mildly alkaline. <br />Texture ranges from loam to clay loam. The soil is <br />normally leached of lime but can be slightly calcareous <br />in places. Wormholes and worm casts are common to <br />depths of 2 feet. <br />Page 11 of 73 <br />