1893. ] NEW YORK ACADEMY OF SCIENCES. 231 
which I have collected or have been enabled to examine is about 
forty. Of these, some are too fragmentary for exact determina- 
tion, others, require further examination and comparison, and 
the remainder are such as have been identified satisfactorily 
with previously described cretaceous species. These latter are 
the only ones which it is proposed to include in this contribu- 
tion, 
The greater portion of the material was personally collected 
on or near.the shore of Hempsted Harbor, at Glen Cove. The 
late Dr. John I. Northrop and other collectors also found speci- 
mens at the same locality and on the near-by Dosoris island. A 
few came from Lloyd’s Neck and Brooklyn, and the remainder 
from Northport and Cold Spring Harbor. All, with the excep- 
tion of a few in the possession of the Long Island Historical 
Society are now in the geological museum of Columbia College. 
The specimens from Glen Cove, Northport and Cold Spring 
Harbor were found in the clays or else intimately associated 
with them. All the others were found in the drift, in ferrugi- 
nous clay concretions or sandstones, exactly as I had previously 
found them to occur in parts of the drift on Staten Island*, 
These concretions and blocks of sandstone may be found every- 
where in the drift to the south of former cretaceous areas. 
They represent fragments of cretaceous clays and sands which 
have been torn up by the continental glacier and carried 
forward in the débris of the moraine, where they have become 
hardened by the infiltration and oxidation of ferruginous matter 
or by the accumulation of limonite on the outside. They are so 
abundant in the drift, wherever this has crossed any cretaceous 
outcrop, that they must have been known for a long time, but 
they failed to attract attention until it was noticed that they 
occasionally contained impressions of leaves and stems of plants, 
when their derivation became an interesting problem. No such 
rock as that in which they were found was known to the north 
of the moraine, and when it began to be appreciated that the 
leaves contained in them were of dicotyledonous plants the 
problem became of still greater interest. Dr. Newberry was 
one of the first to recognize their importance, 
In the Proc. N. Y. Lyc. Nat. Hist. Ist Ser. pp. 149, 150, in 
the account of the meeting of January 9, 1871, the following 
paragraph occurs : 
The President, Dr. J. 8. Newberry, exhibited a piece of red sand- 
stone, containing impressions of leaves, found in excavating the founda- 
tion for the gas office in Williamsburgh [Long Island]. This, he said, 
* “ Paleontology of the Cretaceous Formation on Staten Island.” (Trans. 
N. Y. Acad. Sci. xi. 96-103.) 
