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Taxonomic <br />Group <br />Common Name <br />Scientific Name <br />Federal <br />Status <br />Colorado <br />. Status <br />BLM <br />Sensitive <br />Razaorback sucker <br />Xyraychen texanus <br />Endangered <br />Endangered <br />Mammals <br />Black- footed ferret <br />Mustela nigripes <br />Endangered <br />Endangered <br />Canada lynx <br />Lynx canadensis <br />Threatened <br />Spotted bat <br />Euderma maculatum <br />Yes <br />Townsend's big -eared bat <br />Corynorhinus townsendii <br />pallescens <br />Special <br />Concern <br />Yes <br />1 <br />1 <br />1 <br />Wa1th <br />Environmental Scientists and Engineers, LLC <br />Table 8 Federal, Colorado State, and BLM Sensitive Species in Moffat County (continued) <br />3.10 Rangeland Management <br />Public rangelands administered by the BLM in the proposed lease area are used for <br />livestock grazing and wildlife habitat. The proposed lease area falls within the ColoWyo <br />Common Allotment. There are 173 animal unit months (AUM) of forage available for <br />sheep use from June lst through October 31 There are 347 AUMs of forage available <br />for cattle from May 1 through October 31 Grazing management must adhere to BLM's <br />Standards for Public Land Health and Guidelines for Livestock Grazing Management' in <br />Colorado (BLM 1995). Wildlife habitat is discussed in Section 3.8 <br />3.11 Cultural Resources <br />The Yampa and Williams Fork River area was occupied by a succession of prehistoric <br />cultures beginning about 11,000 years before present and continuing until historic contact <br />with Ute and other Native American tribes (Reed and Metcalf 1999, Husband 1984). <br />Prior to about 8,000 years before present, this area of North America was occupied by <br />people adapted to the hunting of large game animals such as ancient forms of bison. The <br />Colorado Mountains and plateaus were used seasonally by these cultures, but current <br />evidence shows that this use was not intensive. During the interval between about 7,000 <br />years and 5,000 years before present, a combination of factors brought about the end of <br />the highly nomadic big game hunting tradition, and prehistoric cultures turned to a <br />broader base of foodstuffs by focusing on the diverse resources found within more <br />localized territories, a life style termed by archaeologists as the Archaic. The Archaic <br />Period, as it is known, lasted from over 8,000 years before present to perhaps 1,500 years <br />before present. <br />During certain periods, such as a warm interval that culminated about 6,000 before <br />P..PP.WF-CT Culow■u.61814 EA FinnI HL \I - -E.\ Coll.•m 08 2)1 <br />38 <br />