It emerges from New York Bay on Staten Island and
enters New Jersey at Perth Amboy. A well -formed
moraine covers the northern part of Staten Island, and
upon the mainland marks the boundary from Perth
Amboy, around through Earitan, Plainfield, Chatham,
Morris, and Hanover, to Eockaway, and thence in a
southwesterly direction to Belvidere, on the Delaware
Eiver. That portion of New Jersey lying north of this
serpentine line of moraine hills is characterised by the
presence of transported boulders, by numerous lakes of
evident glacial origin, and by every other sign of glacial
action, while south of it all these peculiar characteristics
are absent. The observant passenger upon the railroad
trains between New York and Philadelphia can easily
recognise the moraine as it is passed through on the
Pennsylvania Eailroad at Metuchen and on the Bound
Brook Railroad at Plainfield. Near Drakestown, in Mor-
ris County, there is a mass of blue limestone measuring,
as exposed, thirty-six by thirty feet, and which was quar-
ried for years before discovering that it was a boulder



84 MAN AND THE GLACIAL PERIOD.
brought with other drift material from many miles to the
northwest and lodged here a thousand feet above the sea.
