The fundamental principles of isostacy are well established. The origin of regional elevations and depressions of the earth’s strata has been definitely associated with tangential pressures set up by planetary shrinkage and the transfer of loads from land to sea. Long ranges of mountains paralleling the shore lines of our great oceanic areas and showing the effects of thrusts set up in a landward direction, bear testimony to the fact that the rocks of the earth are pliable and periodically adjust themselves. Every land stream of the globe from the smallest to the largest is constantly engaged in the work...

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