The results of data recovery conducted at six prehistoric sites in the Hart Mine and Cibola Quarry areas are presented. The project area is located at the base of the Trigo mountains about 20 miles south of Ehrenberg, Arizona. Three of the sites are composed primarily of lithic debitage and cores. These sites are associated with an alluvial terrace upon which, among other raw materials, a substantial amount of rhyolite was deposited. The three remaining sites are all located in concealed caves in the mountains. These sites are interpreted caches that were used during the Ceramic or Protohistoric periods. The most surprising finds of the project are three packrat middens. The middens date to between 11,000 and 7,000 B.P. Although not related to cultural behavior, paleobotanical analysis of the middens reveals that this section of the Colorado River Valley supported a large, dense mesquite bosque during this period. These data are the first of this age to be obtained from a low elevation site along the lower portion of the Colorado River.
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