1893.] NEW YORK ACADEMY OF SCIENCES. 231 



which I have collected or have been enabled to examine is abont 

 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 

 Avith 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 North port 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 wei'e 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 hj the continental glacier and carried 

 forward in the debris 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. Lye. Nat. Hist. 1st Ser. pp. 140, 1.50, in 

 the account of the meeting of January *J, 1871, the following 

 paragraph occurs : 



The President, Dr. J. S. 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, 



* " Palaiontology of the Cretaceous Formation on Staten Island.' (Trans. 

 N. Y. Acad. Sci. xi. 9G-103.) 



