of the North American Ice-Sheet. 83 
hundred miles. That of the northern moraine from the east 
shore of Cape Cod to the west end of the Elizabeth Islands is 
sixty-seven miles, while its total length to Port Jefferson is 
about one hundred and eighty miles. The distance between 
these series at Martha’s Vineyard and westward varies from five 
to fifteen miles, but increases eastward to thirty miles, where 
they disappear finally in the Atlantic. 
Extreme Terminal Moraine.—This series of drift-hills in 
New Jersey begins at the Delaware River, a few miles above 
Easton, and extends fifteen miles east-northeast to Townsbury ; 
then twenty miles east by Hackettstown to Dover; thence it 
turns to the south southeast fifteen miles, by Morristown; and 
next to the south-southwest five miles to the east part of Plain- 
field; where, and for ten miles southeast to Perth Amboy, it 
forms the well-known range called Short Hills. The contour 
of this series of deposits is in quite irregular hillocks, with 
frequent enclosed hollows and ponds. Its material is stated to 
be coarse unstratified drift, or clay, sand, gravel, and bowlders 
of large and small size, mixed indiscrifninately together. The 
profile of the country crossed by it rises from about 300 feet 
above sea at the west line of the State to a height of 900 feet at 
the mountain west of Townsbury, and to 1,200 feet on Schoo- 
ley’s Mountain, ten miles farther east; near Dover it has a 
height of 900 feet, from which it descends to sea-level at Perth 
mboy. 
The cntahdation of this moraine into Pennsylvania appears 
to extend southwestward, being represented by a similar series 
of drift-hills, lately traced by Pro essor Frederick Prime, Jr.,* 
in the Saucon valley, ten to twelve miles southwest from Easton. 
e also discovers at about the same distance north from Easton 
a second moraine, reaching some twelve miles from the Dela- 
ware River at Portland, west-southwest to Wind Gap in Kitta- 
tinny Mountain. The perpendicular distance between the lat- 
ter series and the west end of that which crosses New Jersey is 
about eight miles. ae 
Eastward the terminal moraine of New Jersey is distinctly 
continued across Staten Island, where its course is northeast 
twelve miles to Fort Tompkins, which is situated on its crest 
at the west side of the Narrows. On Long Island it forms the 
site of Fort Hamilton, and thence takes a quite direct east- 
northeast course for twenty-four miles to Roslyn; next it runs 
nearly due east about sixty miles to Canoe Place and the Shin- 
necock Hills; beyond which it bends northeast eight miles to 
near Sag Harbor; and thence continues, with some interrup- 
tions, in a course to the east and east-northeast twenty-five 
miles to Montauk Point. This moraine on Long Island consti- 
* Proceedings of the American Philosophical Society, vol. xviii, p. 85. 
