Previous Opinions concerning the Drift Margin.

The terminal moraine running across New Jersey from Perth Amboy to Belvidere, and continuing thence across Pennsylvania, was first traced out under the auspices of the surveys of these states. The work in New Jersey preceded that in Pennsylvania, and was among the earliest morainic studies. In both states the terminal moraine referred to was published as representing the limit of glacial drift, and this conclusion, announced by the surveys of the respective states, was accepted by geologists as correct. Interpreting eastern phenomena by western, glacialists not intimately familiar with the eastern field regarded the southern portion of the New Jersey and Pennsylvania drift as belonging to the first glacial epoch. The fact that the glacial drift of the interior is not limited on the south by a terminal moraine was well known, and the southern limitation of the eastern drift by a terminal . . .

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