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176 Cryohemists-C-ryaquolls association, O. to 12 per• t slopes DRICF MAP UNIT DESCRIPTION This association is in gentle sloping alluvium and in closed basins. The main plant association is sedge/elephant-head on the Cryohemists soils end willow/sedge on the Cryaquolls soils. Elevation ranges from 9,500 to 12,000 feet above sea level. The average annual precipitation is from 20 to 3~i inches. COMPOSITION AND INCLUSIONS This map unit is 50 percent Cryohemists soils located on nearly level and level drainages or closed basins, and 35 percent Cryaquolls soils located on gentle slopes adjacent to the Cryohemists. Included in this unit are small areas of Bowen and Quander soils on better drained slopes. Included areas make up about ~7 15 percent of this map unit. ~^-..li SOILS The Cryohemists soils are deep and poorly or very poorly drained. They 1'ormrd in wet organic materials derived dominantly from accumulated sedge plant materials. A reference pedon has a surface layer composed of dark brown interucdiately decomposed organic material with dark grayish brown mottles. It is about 38 inches thick. The upper substratum is very dark grayish brown loam with dark gray mottles. It is about ~ inches thick. The lower substratum i5 very dark gray gravelly loam with dark brown mottles. It extends to a dep::h of 60 inches or more. Depth to bedrock is more than 60 inches. °ermeabi.lity of the Cryohemists soils is rapid. Available water capacity is medium. Effective rooting depth is more than 40 inches for water-tolerant plants. Runoff is slow and the water erosion hazard is low. Frequent brief flooding occurs on these soils. Depth to seasonal high water table ranges front 6 to 18 inches. 'the Cryaquolls soils are moderately deep or deep and poorly drained. They formed in alluvium of drainages derived dominantly from mixed volcanic :sources. A reference pedon has a very dark gray silt loam surface layer with yellowish brown mottles. It is about 6 inches thick. Tl~e subsoil is very drl l•k I;ray silty clay loam with yellowish brown mottles. IC is about 11 inches thick. The substratum is yellowish brown very gravelly silt loam with dark yellowish brown mottles. It extends to a depth of 60 inches or more. Depth to bedrock ranges from 30 to more than 60 inches. CGT.OU OlCS vlllo~t. IeCpef enC gram ~ UTONCnI5T5 ~,}~1~- ~t. . a`„_ Ir ~ t ' j„he ~.. .. . ,x/n ,~L.Tg~~ , yll'4_• An .l, l~.n--'-•--f~nJGsT~V~o4M4f•Vi ~r 1 :. J1+ ~Y~IYJ~.°S~` ~D - -, o.. _ - _ u. to r T. et. - y,rtH 11> Eeca.yefe0 ~ ';i~.',` I'J erganlc ~-~`~ Vet nine re1~5e11' 'L off nt mteriel5 Figure 6. The Cryohemists soils are deep organic soils, and the Cryoborolls soils are deep mineral soils. Bo/th have high apparent water tables. K ~~,~~ ~ 1 S Ct~`-~U ~,,,-r , .~Cp9-~.e ~,.,.~,~~4R