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It would also appear that so far as the topography permitted, the ice sheets ought to move out uniformly in all directions; hence the ice sheet ought to be as prominent to the north of the Keewatin and Labradorean centers as to the south, which is by no means the case.

Thus there would be an increase in precipitation in about the latitude of the Keewatin and Labradorean centers of glaciation.

The southwestward advance of the European ice sheet and the southeastward advance of the Labradorean sheet in America were stopped by the Atlantic.

On the other hand, Salisbury estimates that perhaps a third of the Labradorean drift in eastern Wisconsin is crudely stratified, about half of that in New Jersey, and more than half of the drift in western Europe.

The ice spread out from two great centers in North America, the Labradorean east of Hudson Bay, and the Keewatin west of the bay.