This skull was taken from a mining shaft at Altaville, at a depth of one hundred and thirty feet from the surface, beneath seven different strata of lava and gravel. Prof. Whitney was not present when it was found. He, however, made it his business to examine into the facts of the case, and he thus speaks of it: “That the skull was found in these old, intact, cemented gravels has been abundantly proved by evidence that can not be gainsaid.” And again: “So far as human and geological testimony can at present be relied on, there is no question but that the skull was found under Table Mountain, and is of the Pliocene Age.”8
This would seem to be pretty explicit, but, as we have said before, Prof. Whitney, in his formal report as the State geologist of California, reaches the conclusion that the auriferous gravels of the Pacific are all of the Tertiary Age. It is therefore not a little interesting to learn that numerous instances are recorded of the finding of human remains or the works of man in these gravels. Prof. Whitney mentions twenty such instances.9 Mr. Bancroft furnishes us a list of such discoveries, giving as his authority Mr. C. D. Voy, of the California Geological Survey, of Oakland, California. He states that Mr. Voy personally visited most of the localities where the discoveries were made, and took all possible pains to verify their authenticity, and in many cases obtaining sworn statements from the parties who made them.10
Two stone mortars and spear-heads, six and eight inches long, were found in the gravel under Table Mountain, just mentioned. These relics were found about three hundred feet from the surface. A hundred feet and more of this depth was of solid lava. At another place a stone bead was found three hundred feet from the mouth of the tunnel, under a thick layer of lava. Many other instances might be given of such discoveries, not always under lava coverings, but always in such instances that we are compelled to assign to them an immense antiquity. As, for instance, at San Andreas, according to a sworn statement in Mr. Voy’s possession, large stone mortars were taken from a layer of cemented gravel, overlain by one hundred and twenty-five feet of volcanic and gravel materials. Many similar instances are on record, but enough have been mentioned to serve the purpose of the chapter.11
As we have briefly gone over the ground on which the antiquity of man in America is, by some, referred to the Pliocene Age, it is but fair to notice some of the objections that have been raised. It is not necessary to point out that the only questions worthy to be considered are of a scientific nature.
We must deny either the age of the gravels themselves or that the objects of human handiwork were found as claimed, or else that they are of the same age as the gravels. Prof. LeConte thinks, from the nature of the gravels and the peculiar circumstances which surround them, that they are not older than the close of the Pliocene Age. He thinks they, in fact, belong to the transitory period between that age and the Quaternary.12 But as we are considering the question of Pliocene man, it makes but little difference if the gravels do belong to the very close of that period. They may still be called Pliocene.
One great trouble with those remains is that they were not discovered by professed geologists. We have to depend upon the statements of miners. But if their statements can be believed (and why should they not?), there is no doubt about their genuineness. The testimony, as Mr. Whitney says, “all points in one direction, and there has never been any attempt made to pass off on any member of the survey any thing out of keeping, or—so to speak—out of harmony with what has been already found, or might be expected to be found. It has always been the same kind of implements which have been exhibited to us, namely, the coarsest and the least finished, which one would suppose could be made, and still be implements at all.”13 This result would hardly be possible, where so many parties are concerned in furnishing the evidence, if the objects were not genuine.14
In opposition to this conclusion it has been urged that the stone mortars, pestles, etc., have become imbedded in the gravel by the action of streams, or slips from the mountain side in modern times, or are the results of interments or mining operations.15 As an illustration of how they might become buried by the action of streams, reference is made to somewhat similar discoveries in the tin-bearing streams of Cornwall (Wales). We know with considerable certainty that at a very early date the Phœnicians worked in the gravels of these streams for tin ores. Implements made use of by them and others—such, for instance, as shovels, mortars, pick-axes, stone bowls, and various dishes—have been found at all depths in this gravel, by more modern miners.16
This may explain the presence, in some instances, of similar remains in California, but it utterly fails to do so, where the remains have been buried underneath a lava flow or a bed of volcanic materials, as is the case in many of the instances we have cited. Manifestly no water has disturbed their strata since the volcanic materials were laid down. Neither can we think of a land-slide carrying these remains into the heart of a mountain, or burying them underneath a hundred feet of lava. The peculiar position in which they were often found is surely lost sight of by those who think they might have been placed there by interment. We can not think of a savage people digging a grave in such a position.
It has been urged with considerable force that these relics have been left behind by ancient miners when they mined for gold. Dr. Wilson is cited as authority for the statement that the Mexicans obtained “silver, lead, and tin from the mines of Tasco and copper was wrought in the mountains of Zacotollan by means of galleries and shafts, opened with persevering toil where the metallic veins were imbedded in the solid rock.” Prescott, the historian, also testifies to the same fact.