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Altogether, miners found hundreds of stone implements - mortars,
pestles, platters, grinders, and so forth. Many of the specimens found
their way into the collection of Mr. C.D. Voy, a part-time employee of the
California Geological Survey. Voy's collection eventually came into
the possession of the University of California, and the most significant
artifacts were reported to the scientific community by J.D. Whitney, then
the state geologist of California.
J.D. Whitney thought the geological evidence indicated the auriferous--or gold-bearing-- gravels, and the sophisticated stone tools found in them, were at least Pliocene in age. But modern geologists think some of the gravel deposits, which lie beneath volcanic formations, are much older. |
