Man and the Glacial Period. 185 
border of the later drift, but that the}' constitute one of the 
clearest proofs of an earlier glacial epoch. 
1. The farther south these deposits are detected, the greater 
is the likelihood that they were independent of the later ice-sheet. 
Everything south of the moraine is treated as belonging to one 
category. A series of deposits is enumerated, beginning with 
Oxford Furnace and J^ittle York, N. J., three miles south of the 
moraine, which all will concede are true land-ice deposits, and 
continuing on, without break, to -'glacially striated boulders' at 
Monmouth Junction, N. J., thirty miles south of the moraine, "a 
subdued terminal moraine " eastward from Trenton, forty miles, 
"drift closely resembling till," at Falsington, just west of Tren- 
ton, and '-drift' at Bridgeport, opposite Xorristown, Pa., fifty 
miles south of the moraine, "the southernmost point at which 
glaciall}' striated material has been seen. " 
Since it was pointed out* thatthese southernmost deposits are all 
within 100 feet above tide and have doubtless been transported by 
water and floating ice from the glaciated area, the author quoted 
has, as I understand, relinquished any claim that he may seem to 
have made, that an ice-sheet ever.extended further south than High 
Bridge and Pattenburg, X. J., about thirteen miles south of the 
moraine. This simplifies the problem, and greatlj' reduces the 
area which needs discussion. 
2. The claim is still maintained that the glacial deposits south 
of the moraine exhibit such superior oxidation as to prove their 
vasth' greater age. This is a -more difficult question to decide. 
The claim should rest upon an extensive series of comparisons, * 
and it should be shown (1) that the oxidation took place in situ, 
and (2) that it was post-glacial and not pre-glacial. The deposit 
at High Bridge, X. J., upon which stress is laid, certainly exhib- 
its a high degree of oxidation and ferrugination, but it must be 
clearly differentiated from the deposits nearer the moraine, (a) in 
that it contains little or no material that has been In'ought from as 
far north as Kittatinny mountain, (A) in that it rests in a cradle of 
decomposing, ferro-magnesian, Archaean gneiss, into which its 
finer elements almost seem to graduate at the eastern end of the 
cut, thus suggesting that its material is mostly- local and its oxi- 
dation pre-glacial. 
3. The general composition of the deposits between the mo- 
*Amkri('ax Gk(>i>()gist, x, 207. Am. .Tour. Sci., xltv, 351. 
