As to these investigations on the Pacific slope of the
United States, the discoveries of Whitney and others in
California had been so made and announced that the judgment of
scientific men regarding them was suspended until the visit of
perhaps the greatest living authority in his department, Alfred
Russel Wallace, in 1887. He confirmed the view of Prof. Whitney
and others with the statement that "both the actual remains and
works of man found deep under the lava-flows of Pliocene age show
that he existed in the New World at least as early as in the
Old." To this may be added the discoveries in British Columbia,
which prove that, since man existed in these regions, "valleys
have been filled up by drift from the waste of mountains to a
depth in some cases of fifteen hundred feet; this covered by a
succession of tuffs, ashes, and lava-streams from volcanoes long
since extinct, and finally cut down by the present rivers
through beds of solid basalt, and through this accumulation of
lavas and gravels.
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