The Earth's Shifting Crust by Charles Hapgood - wire of information

THE GREAT EXTINCTIONS 251
we would find a combination of plants in its stomach reflect-
ing a much warmer climate, but, of course, it is unlikely that
during that warmer period any mammoths would have been
preserved.
Just as we assume that North America subsided a thousand
feet or more relatively to sea level when the continent was
being moved equatorward, this being followed by a later
isostatic rebound of the crust, so we must logically assume a
progressive uplift of Siberia during its poleward displacement,
with subsidence since.
This uplift of Siberia, which I now suggest, is vitally im-
to the mam-
portant for the clarification of the facts relating
moths. If we assume that, previous to the displacement, the
elevation of the lands in eastern Siberia and the Arctic was
about the same as now, we can see in this moderate uplift
(which is a necessary corollary of crust displacement) sufficient
added elevation to connect both the New Siberian
Islands with the Asiatic mainland, and Asia with North
America across the Behring Strait. Thus the migrations of the
animals to the New Siberian Islands and between Alaska and
Siberia are explained, without having to have recourse to
the theory of a sea level controlled by glacial melt water.
Then, the subsidence of the area by isostatic adjustment after
the end of the displacement (let us say, between 10,000 and
3,000 years ago) would have separated America, Asia, and the
New Siberian Islands, and it provides us with a clear and
sufficient explanation for the reported dredging up of mam-
moths' tusks from the bottom of the Arctic Ocean, or of their
being thrown up, as it is said, upon
the beaches of the Arctic
Ocean during Arctic storms.
The progressive elevation of Siberia during the displacement
provides us, finally, with a very complete explanation
of the many curious, enigmatic circumstances surrounding
the discovery of the mammoths' remains, and those of other
animals. But before these problems can be explained, another
circumstance must first be briefly discussed.
I have mentioned that volcanic eruptions would be having