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63 <br />• and these have been sorted according to only the very obvious character- <br />istics. It is risky to place too much emphasis on minor variations in <br />fragmentary artifacts. A larger sample is necessary to arrive at a more <br />definitive typology. <br />Stone Tools <br />Introduction <br />The lithic materials recovered fall into two major categories: chipped <br />stone and ground stone. The chipped stone category is then broken down <br />into sub-groups or types, depending upon morphological characteristics <br />such as outline, cross section, edge placement, flaking pattern, and <br />relative size. Ground stone tools are organized on similar principles, <br />although the criteria include treatment of the grinding surface, treatment <br />i• of the blank from which the item was manufactured, number of working <br />facets, and the direction of marks resulting from use. Additionally, the <br />size, depth, and shape of the grinding area is used to differentiate be- <br />tween types. There are several other categories which are described in <br />the typology, such as cores, hammerstones, choppers, and unique items. <br />Chipped Stone <br />Flaked or chipped stone tools deserve the greatest attention not <br />only because they are generally regarded as the most typical of artifacts, <br />but also because they are more sensitive indicators of the cultural ele- <br />ment in any given group. Changes occur through time in overall shape, <br />size, and methods of manufacture. These changes provide an indication of <br />_he ~~elative age of the site from which the tool came. <br />• <br />