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13 <br />• 1. Sites are assumed to have been the geographic foci of purpose- <br />ful human activity. <br />2. That activity will have left indications in the form of more <br />than one item of portable material culture within a radius of <br />100 m. <br />3. Therefore, we have defined site as any locality in which arti- <br />facts or industrial waste materials occur within 100 m. of each <br />other. <br />4. We have also defined site as any locality with one or more <br />features (stationary objects such as firepits), whether or <br />not it yields portable items in the density specified <br />These criteria are required mainly for the separation of sites from <br />• isolated artifacts which came to rest at their points of discovery <br />~ primarily as unintentional results of past human use of the region. Iso- <br />lated occurrences of projectile points and scrapers are common, yet arti- <br />factual densities on many sites are low. Therefore, arbitrary differentiat- <br />ing criteria are the only consistent means for identification of sites <br />and isolated finds (IF's). <br />Site Types <br />Site types are differentiated primarily by the kinds of activities <br />and periods of occupation represented by the deposits. The major distinc- <br />tion is between prehistoric and historic sites. Historic period aboriginal <br />sites are not very different from late prehistoric sites (Mulloy 1958: 151), <br />with the exception of the presence of items of European manufacture such <br />as glass, metals, and trade goods. All historic sites of Euro-American <br />