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amount of exposed rack and shallow soils. The high ratio of juniper to <br />pinyon pine may be due in part to elevation, aspect, and summer precipita- <br />tion levels (Tueller et al. 1979). <br />Adjacent Mapped Areas <br />Two additional vegetation types outside the surface disturbed area are <br />shown on the vegetation map (Exhibit 2.04.10-A). They are ponderosa <br />pine/Douglas-fir and aspen, neither of which will be disturbed by mining <br />operations. Stands of both occur with the oak shrub south of the North <br />Fork of the Gunnison River. In the ponder-rosa pine/Douglas-fir habitat, <br />Douglas-fir is the dominant tree and the ponderosa pine is largely absent, <br />reflecting the influence of the northern aspect of the site. Herbaceous <br />understory is sparse under the closed canopy of dense Douglas-fir stands <br />• (Costello 1954). Typical associated species are given in Table XVII.2, <br />Appendix XVII. The aspen groves here occur at the lower limit of their <br />elevational range, small, occasional patches on moist sites in canyons at <br />the edge of Douglas-fir stands. Associated species are listed in Table <br />XVII.2-1, Appendix XVII. <br />Rare and Endangered Species <br />In 1976, information concerning threatened or endangered plants <br />(Federal Register 1976) was obtained from detailed literature and herbarium <br />searches (Bureau of Land Management 1976). This research revealed that no <br />such plants are known to have occurred historically in the area of the <br /> Hawk's Nest Mine. This same study also included a detailed inventory of <br /> the area in which no proposed or candidate endangered or threatened species <br />• were found to be present. The site of the referenced study was immediately <br />2.04-47 <br />