Skates, Thornbacks, and other fish.
No traces of cannibalism have been detected. Most of the hollow bones of larger mammals, and even the smaller bones of the foot, were found to have been split to get at the marrow.[[31]]
Fireplaces.—These were generally known by beds several feet in length consisting of charcoal and yellowish ashes. They occurred in many spots throughout the mound. Numberless scattered bits of charcoal[[32]] and pebbles, mostly about the size of one’s fist and blackened by fire, were further evidences of the continuous use of fire in the preparation of food. In no instance were there any stones set in rows for fireplaces, such as have been observed elsewhere, as in a shellmound near Sierra Point, where stones are plentiful.[[33]] A very peculiar feature of this mound is a yellowish layer of ashes comprising the entire depth of stratum II in [pl. IV], and tapering towards the edge of the mound. Above it lies only the uppermost stratum (I), that of vegetable soil. Though calcined shells[[34]] occurred elsewhere in the mound, they were especially numerous in this ash stratum, and in some spots all shells were calcined. The origin of this ash stratum will be explained later. A similar bed is to be seen in a central layer of the shellmound at West Berkeley, and another one of similar thickness but shorter in a mound near Sausalito.
Human Remains and Relics.—A large part of the Emeryville mound consists of remains which have been deposited here by man. Among these are molluscan shells with bones of fish and mammals, used as articles of food. In the narrower sense the human relics consist of the bones of man, graves, and artifacts, which are all found in greater or less abundance throughout the whole thickness of the mound. Actual human bones were not found to be common in this part of the mound except in stratum II, and in the graves of stratum VII. The artifacts obtained were only those of very resistant material, such as stone or shell. All other kinds, such as textiles of plant fibre, baskets, and implements of wood, which doubtless have also existed, had disappeared. The more resistant artifacts were distributed throughout all layers of the mound.[[35]]
About 200 cubic meters of earth were removed and sifted during the excavations, and yielded 600 artifacts of various kinds, averaging three specimens to one cubic meter. The volume of the whole mound we computed to be about 39,000 cubic meters, and it may be assumed that by excavating the entire mound the yield would be about 100,000 specimens, which indicates that many generations must have lived here to deposit such a large number of objects of imperishable material alone.[[36]]
The same computation was applied to each separate layer in the mound, and it was shown that the yield differed according to the section and the stratum explored. The open cut A yielded one specimen to .75 cb. m., and the tunnel B and the pits h to m, six per cb. m. Section C yielded three artifacts to one cb. m. This computation shows that sections nearer the center of the mound yielded the greater number, those toward the edge a smaller number. It also appears that the lower strata contained a larger percentage of artifacts than the upper ones. If, however, the number of flaked chert fragments were subtracted from the yield of the lower strata, their percentage would be much the same as that of the higher layers. The following are the contents of the various strata:
Stratum I had 20 artifacts per 15-1/2 cb. m. = 1.3 per cb. m.
Stratum II, 30 cb. m—133 objects = 4.4 per cb. m.
Stratum III, 20-2/3 cb. m—27 objects = 1.16 per cb. m.
Stratum IV, 11-3/4 cb. m.—41 objects = 3.5 per cb. m.