180 TRANSACTIONS OF THE [may 13, 
but that is as far as we can go at present. ‘There are ledges of 
rock from which they might have been derived in Morris County, 
N. J.,' but the abundance of silicified fossils in the Preglacial 
Drift would seem to require some less remote source. 
A remarkable feature of these gravel-beds is their immediate 
proximity, at all the known outcrops, to beds of the very finest 
mechanical sediments. Dr. Newberry was especially impressed 
with this occurrence at Glen Cove. It is the same at this new 
locality on Staten Island, and in the exposures at Fish House 
Station, near Camden, N. J., where I obtained a single silicified 
Aitrypa reticularis when examining the clay-pits at that place 
with Professor Cook, in 1883. The gravel does not appear to 
form strictly continuous strata, and must vary greatly in thick- 
ness within very narrow limits of space. 
QUATERNARY. 
The Ferruyinous Quartz and ‘‘ Jasperoid Rock” overlying the 
Serpentine at Hoboken and Staten Island. 
This material appears to be of the same age as the limonite 
with which it is associated. The rock from Hoboken has been 
alluded to by Professor Cook in the ‘‘ Geology of New Jersey ” of 
1868, but the exposures seen by him were not sufficient to af- 
ford any certain indication of its geological position. It may 
have been previously mentioned, but I have at present no earlier 
references. Professor Cook hazarded the supposition that ‘‘ it 
was a part of the Red Sandstone (Triassic) formation, changed 
at its contact with the serpentine,” and described it as silicious 
and hard. Mr. I C. Russell, in his paper on the ‘‘ Geology of 
Hudson County,” ’® briefly describes it under the name ‘‘ Jasperoid 
rock,” which he states was given it by Professor Henry Wurtz 
some ten years before, or about 1870; but I have no other refer- 
ence to Professor Wurtz in the matter. Mr. Russell referred it 
to the Archean. but added, ‘‘ We can offer little information con- 
cerning it.” Professor Kemp visited the locality with me in 
1886, and I recognized in some of the material then exposed an 
apparent identity with the ferruginous quartz rock of the hills 
on Staten Island. Here it is found in loose masses nearly all 
over the serpentine area. Sometimes it is very finely crystal- 
line, and occasionally I have seen crystals nearly half an inch in 
1 See Merrill in Ann. Rep. State Geol. N. J., 1886, 134, where is 
shown the existence of silicified fossils in the Green Pond Mountain 
system, and the possibility of this source for some of the Preglacial 
gravel is briefly discussed. 
* ANNALS of this Academy, II., 32 (1880). 
