1981-11-13_PERMIT FILE - C1981013 (29)

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2.04.9 Page 11 of 46 Q F--Midnight- Rombo' complex, 35 to 50 percent slopes. This map unit is on mountainsides below basalt dikes. Slope is 35 to 50 percent. The native vegetation is grass, brush, and a few widely spaced trees. Elevation is 7,000 to 8, 500 feet. The average `annual precipitation is about 18 to 23 inches, the average annual air temperature is 42 to 46 degrees F. , and the average frost-free season is 80 to 105 days.' This unit is 45 percent Midnight channery and flaggy silty clay loam and 45 percent Rombo channery and flaggy silty clay loam. Midnight soils are near the top of the mountainside adjacent to basalt dikes,. Rombo soils are on the lower part of the mountainsides. Included in this unit are b,nsalt dikes at the crest of the mountain. Also included are small areas of rock outcrop on lower slopes. The midnight soil is shallow and well drained. If formed in residuum and colluvium derived dominantly from shale. Typically the surface layer is channery or flaggy silty clay loam 4 inches thick. The subsurface layer is very shaley silty clay loam over weathered shale bedrock at a depth of 16 incnes. The soil is neutral. The shale Vedrock is calcareous between the seams. Permeability of the Midnight soil is moderately slow. Available water CAPOCity is very low. EffecLlve ronuinr depth is Is to 20 inches. Annoff is v-rw rapid and the hazard of water erosion is very high. :he Nomho s: it is moderntel; Opp and well AraLned. It formed in stony . :i "m ana _ -idqu , ' -'* . .'d domin nt v _rcm Ailthtnne, sink , and bnsalL. Typically the surface layer is channery and flaggy silty clay loam 4 inches thick. :he upper 20 inches of the subsoil is very shnley and channery silty clay loam. The lower 10 inches is very shaley silty clay loam over gray shale. The soil 1 is neutral throughout. This unit is used for livestock grazing and wildlife habitat.