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8 <br />evaluated under Criterion d, for their potential to • <br />Prehistoric resources are most often <br />yield information important to studies of prehistory. Significant information potential in a <br />prehistoric site requires that the site contain intact cultural deposits or discrete activity areas that <br />can be securely associated with a temporal period or named cultural group. The potential for <br />intact deposits or cultural/temporal associations may be inferred from surface evidence of <br />cultural features or undisturbed Holocene deposits, and the presence of temporally or culturally <br />diagnostic artifacts. Historic resources may be evaluated under any of the Criteria. However, in <br />the absence of structural features or documented association with significant historic events or <br />important contributions of persons significant in history, historical resources are evaluated under <br />essentially the same criteria as prehistoric resources. <br />Field/Lab Methods <br />The block was surveyed utilizing pedestrian transects at intervals spaced no more than 20 <br />m. The access road leading into the block was surveyed with zig-zag transects to a distance no <br />greater than 15 m (50 ft) from the centerline, for a corridor 100 ft wide. The subsidence zone <br />was not formally surveyed; instead, the cliff walls and large boulders were inspected for evidence <br />of rock art or inscriptions, as well as cultural use of shelters. <br />When cultural material was encountered, the immediate area was intensively examined to <br />determine the nature and extent of the resource. MAC defines sites as five or more artifacts; or a <br />feature, structure, or trail; or any combination of these elements meeting OAHP criteria in a <br />discrete location that is believed to represent the locus of patterned human activity. An isolated <br />find is defined as four or fewer artifacts without evidence of, or potential for additional cultural <br />materials or features in the immediate vicinity. An isolated find can also represent a single event <br />or many pieces of a single artifact. Once defined, resources were recorded on appropriate OAHP <br />forms. Site sketch maps were drawn on graph paper utilizing ahand-held Magellan Mobile <br />Mapper GPS unit, and all GPS readings were georeferenced to UTM meters and NAD 27, <br />WAAS corrected to 2-5 m accuracy, then post-processesd in the lab to within 1 m accuracy. <br />Sites were photographed using color film and plotted on a USGS 7.5' quadrangle map. A GPS <br />position of the datum was taken, which is a length of 1/2" white PVC pipe with an attached metal <br />tag embossed with a four digit number, used as the temporary site number. The temporary site <br />number is prefixed with the initials MM. <br />Artifacts were analyzed in the field. MAC analyzes artifacts by type and materials. <br />Lithic debitage is further characterized by placement in the reduction sequence. Primary flakes <br />have 100 % cortex on the dorsal surface and tertiary flakes have no cortex on the dorsal surface. <br />Secondary flakes fall between these two extremes. No artifacts were collected. <br />• <br />