Assigned to Phase I are three heavy points which, because of their nature, stand in contrast to the typical patinated basalt specimens; yet their association in the site deposit is such that they must be considered along with other projectile points as belonging to the Phase I period. Plate 21, _l_, illustrates a dark-brown chert blade with a concave base which was flaked either by controlled percussion or a rough-pressure technique. This specimen was found in direct association with an extended burial of the Phase I type (Treganza and Malamud, 1950, pl. 15, _f_; pl. 21, _i_), and hence has been assigned to this period. Though its presence appears out of character with the heavy basalt examples, this association is not necessarily unique, for almost an identical example may be noted for the Lake Mohave Culture (Campbell _et al._, 1937, pl. XLIV, _e_; pl. XLV, _d_). A second specimen composed of a white chert and having a broad angular stem base finds no other parallels in the Topanga area (pl. 21, _k_), yet it too occurs in the Lake Mohave area where such forms are classed as a Silver Lake type (_ibid._, pl. XLII, _d_). The third specimen is composed of a thin piece of laminated chert, leaf-shaped in form, and displays only slight marginal flaking in its original shaping. This example was recovered at a depth of 60 inches and marks the greatest depth of any projectile point recovered from the Tank Site. [Illustration: Figure 4. Projectile Points] Table 4 Projectile Points