3. Spheroidal cobbles of varying sizes were encountered, especially in association with features. None appears to have been artificially shaped either by pecking or grinding, and hence we assume they represent highly selected specimens collected from the numerous conglomerate exposures found in Topanga Canyon. Circumstances surrounding their occurrence offer no clue as to their possible use.
4. Half of a biconically drilled chlorite-schist bead, 1.5 cm. long, and about 1 cm. in diameter. Both ends appear to be roughly serrated, but this feature may be accidental. That the bead was at one time worn on a string appears evident from the high luster at the juncture of the two conical drill holes.
5. A perforated tip of a fossil shark tooth, on which the enamel is largely lacking.
BONE IMPLEMENTS
It can be said with certainty that bone tools in any form were not characteristic of the Tank Site in either Phase I or Phase II.
From both season’s work were recovered a single fragment of a bone awl, a small section of polished bone containing a light drill pit, and the tip ends of six antlertine flakers. The antler specimens all occurred in the 0- to 12-inch level and probably should be assigned to Phase II since their distribution would coincide with the pressure-flaked projectile points.
This near-complete lack of bone artifacts is a pronounced contrast with later coastal and interior sites. In part it can be suggested that wooden objects were manufactured at the Tank Site as a substitute for bone.
OTHER REMAINS
Unworked Bone and Shell
The nonhuman bone recovered consisted primarily of highly fragmented cannon bones, none of which lent itself to positive identification. The total bulk of such refuse was surprisingly low. We can make no claim that mammal bone has disintegrated and disappeared in the course of time, for human bone, though by no means well preserved, was relatively abundant in small pieces (see features).