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

288 EARTH'S SHIFTING CRUST
that the Mankato Advance of the ice sheet occurred only
1 1,000 years ago, and yet some deposits of Mankato age con-
tain pieces of wood that have been found to be more than
30,000 years old. These must have been included originally
in older glacial deposits.
Our theory may explain not only the earlier phases of the
Wisconsin glaciation but also why most of their traces were
destroyed. Let us assume that 50,000 years ago the previous
crust displacement started shifting the pole from southern
Greenland toward Hudson Bay. This would have started an
expansion of glaciation in North America, with the ice mov-
ing toward the west and south. We must visualize a gradual
lowering of the temperature over a period of several thousand
years, with those sudden changes resulting from volcanism
with which we are already familiar. In this case, instead of
each advance of the icecap falling short, at least in some
places, of the preceding advances, so as to leave traces in the
form of undisturbed moraines, the contrary happened. As the
crust moved, the pole was steadily advancing from the north-
east, and therefore each phase of expansion of the ice sheet
would naturally carry the ice front farther than the one be-
fore, plowing up and destroying the evidences of earlier
phases, obliterating the record and incorporating the older
glacial material with its own debris. Not until the climax of
the glaciation was reached, with the Farmdale Advance, did
a change in this situation occur. The date of this advance,
therefore, may have been the time when the Hudson Bay
region reached the pole and the crust ceased to move.