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In all, 35 species were encountered in the herb quadrat samples <br />• from the two stands (Table J21). Cover by herbaceous species <br />underneath the sagebrush canopy was sparse (58), composed of <br />species listed in Table J21. <br />RELATIONSHIP OF VEGETATION TO SOIL TYPES <br />Tiedman and Terwilliger (1978) have classified the vegetation <br />and soils units of the Piceance Basin into 18 phyto-edaphic units <br />(PEU) based on a study of the vegetation and soils in relation <br />to landform, geological material and climate. Eight of Tiedman <br />and Terwilliger's (1978) PEUs are relevant to the Colony permit <br />areas. <br />Phyto-Edaphic Unit 1 - Aspen Forest/Pachic Dark Brown Loams (Aspen <br />Woodland in the areas) <br />• Soils of the Aspen Woodland type are moderately deep with a thick <br />(more than 16 inches) dark brown loam surface layer rich in organic <br />matter. Soils may or may not contain accumulation of clay in <br />the subsoil. Soils are more than 30 inches deep to bedrock or <br />to very gravelly layers with more than 60 percent gravel, cobbles <br />and stones. <br />The representative soil profile for this unit is a member of <br />the loamy-skeletal mixed family of Argic Pachic Cryoborolls. <br />Typically, these soils have dark grayish brown, fine sandy loam <br />and loam surface layers to 23 inches. Subsoil is grayish brown <br />loam and very gravelly sandy loam to 30 inches. Substratum is <br />dark grayish brown gravel and cobbles to 60 inches. <br />Phyto-Edaphic Unit 2 - Douglas-fir Forest/Dark Brown Gravelly <br />Loams <br />n <br />~J <br />J-11 <br />