The two phases of the Topanga Culture are derived primarily through differences in projectile points and burial customs. Phase I is characterized by large percussion-flaked blades and points (pl. 21) which occur in the Tank Site (LAn-1) from the surface to 60 inches in depth with the greatest frequency below 18 inches (see table 4), and no similar type points or blades have been found in LAn-2. Phase II projectile points are smaller, varied in type, and are pressure flaked (pls. 22, 23, _f-m_). These points are confined to the upper 18 inches of the Tank Site and are exclusive to LAn-2. There are three forms of interment in the Tank Site, all of which characterize Phase I: (1) primary inhumation, extended, prone or supine, head southerly; (2) reburial, segments of long bones only, generally under an inverted metate; and (3) fractional burial with interment of long bones only. By virtue of its deep occurrence the reburial is the most ancient in the Tank Site (Treganza and Malamud, 1950, p. 135, burial 8). Phase II burials are flexed, with no specific orientation, and occur both with and without rock cairns. These burials were all limited to LAn-2. Since clear-cut stratigraphic evidence is lacking it is difficult to assign other classes of artifacts as being definitely associated with any one specific phase of the Topanga Culture. Some general statements can be made. The large quantity of basalt core tools, especially scraper planes, occur deep in the Tank Site and are far less common in LAn-2. Manos and metates bear out the same relationship; however, both these types of artifacts span the time gap from early occurrences to the historic period. It is only when one or both of these elements characterize or dominate a site, such as in LAn-1, that they have diagnostic or comparative value in so far as the Topanga Culture is concerned. Cog stones, discoidals, and crescentic stones, or "amulets," are unique types of artifacts, and when found in the right association with other artifacts may prove to be valuable horizon indicators. Cog stones and discoidals occur most commonly along the interior margin of the southern California littoral, and, where documented, the mano and metate are also present. Crescentic stones, as an artifact type, have been most objectively associated with the San Dieguito of the San Diego coast and the San Dieguito-Playa (Lake Mohave) Culture of the eastern desert. However, the crescentic stone in its various forms expresses considerable latitude in time and space.