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Map Unit No. RL Rockland 5 to 65 percent slopes. <br />These gently to steeply sloping, sandstone/shale exposures are on <br />slope breaks, ledges and ridges. Slopes are broken. The native vege- <br />tation is very scanty with a few brush and forb species. Elevation <br />is 6800 to 7800 feet. The average annual air temperature is about <br />38° to 43°F, the average frost-free period is 70 to 90 days, and <br />precipitation is about 17-20 inches. Soil temperatures are in the <br />cryic soil zone. Individual areas of this unit are irregular in shape <br />and range from a few to several acres in size. <br />Included in mapping are small areas of shallow soils supporting <br />some vegetation. Topsoil salvage operations are not. recommended because <br />of the limiting depth to bedrock and lack of adequate, suitable topsoil <br />material. Because of shallow depths and rock exposures no soil, <br />sampling or Pedon descriptions were considered necessary for evaluation <br />of map unit. <br />-21- <br /> <br />