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EVIDENCES OF GLACIATION 211
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" Though not of glacial origin, the Pensauken formation was probably contemporaneous with one of the early glacial formations."
There
is a small area of land on Staten Island directly in front of the
moraine which seems devoid of this drift deposit. It forms a bare
patch, as it were, and the moraine recedes behind it in a re-entering
curve (Fig. 51). It lies around and behind New Dorp. Professor
Salisbury, corn-
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menting
on this, says: " The study of the position of the moraine in its
relation to topography shows that this bend in the moraine occurs
southeast of the highest point on the island. These relations are in no
way accidental. The effect of the high land was to retard the movement
of the ice, and the highest land retarded it most. In the lee of the
highest point, therefore, the advance was least. It is significant that
the ice surmounted the summit and started down its southern slope,
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