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4-66 <br />• 5 percent stones; lime deposits on surfaces of <br />coarse fragments; coal fragments; pH 7.6; gradual <br />smooth boundary. <br />C2ca 30 to 37 inches; pale brown (lOYR 6/3) gravelly <br />sandy loam and sand, yellowish brown (lOYR 5/4) <br />moist; moderate fine granular structure; soft, very <br />friable, non-sticky and non-plastic; strongly cal- <br />careous; 25 percent gravels, 10 percent cobbles; <br />pockets of loamy sand material; pH 7.6; gradual <br />smooth boundary. <br />C3 37 to 71+ inches; pale brown (lOYR 6/3) clay loam, <br />• brown (lOYR 5/3) moist; massive structure; soft, <br />friable, sticky and plastic; calcareous; pH 7.8. <br />The A horizon has a hue of 2.SY or lOYR, value of 5 or 6, and a <br />hroma of 2 or 3. The C horizon has a hue of 2.5Y or lOYR, value <br />of 6 or 7, and a chroma of 2 through 4. It is very gravelly sandy <br />loam to very gravelly light clay loam. It contains from 35 to 70 <br />percent gravels. <br />4.7.3.4. Rivra Variant <br />The Rivra variant consists of deep, moderately textured, well- <br />drained soils, These soils formed in mixed alluvium. Elevation <br />range is 5,200 to 5,600 feet. Annual precipiation is about 10 <br />• inches. The mean annual soil temperature ranges from 40° to 47°F, <br />