Certain elements in the Topanga Culture might be viewed as "_index artifacts_" when they occur as associates. To have comparative value it is the combination of traits which create the cultural pattern and not the isolates. Phase I is characterized by a combination of extended burial with the head south, reburial of long bones under metate, fractional burial, percussion-flaked projectile points and blades, dominance of flake and core tools, dominance of milling stones with wide variation in the hand stone (mano), crescentic stones, stone cogs, and stone discoidals. The latter two may occur late in this first phase. Phase II has flexed burials with no specific orientation, an occasional rock cairn in association, pressure-flaked projectile points constituting several types, and dominance of the cobble mortar and pestle as milling implements, though the latter may occur toward the end of Phase I. Through lack of clear-cut stratigraphic evidence, all other artifacts described for the Tank Site will have to be considered either as late Phase I or early Phase II. Unless subsequent excavations at LAn-2 produce data of a nature different than that already described, this latter site should represent the type site for Phase II of the Topanga Culture. Following the first published Topanga report, two village sites along the adjacent coast have been excavated, both of which share comparative traits with the two phases of Topanga Culture (Wallace, 1954, 1955; Peck, 1955). Both authors were handicapped in making comparisons, since this final report was not available. With future comparisons to be made, a clarification of some statements might be in order. Wallace (1955, Table I, p. 220) in presenting "milling stone horizon cultural assemblages" uses nine broad comparative categories for five different geographical areas in which each area is known by one or more excavation sites. The traits listed by Wallace under the heading of Topanga are those characteristic of Phase I with the possible exception of the mortar and pestle. "Few clam disk beads" are also listed. The only shell artifact found in the Tank Site was a single massive clam-disk bead which, because of its shallow occurrence (4 inches), is probably a Phase II artifact.