1884.] NEW YORK ACADEMY OF SCIENCES. 31 



East and south of Tottenville there is a stretcli of sandy 

 country, in all of about one square mile, which is occupied by 

 the Pre-glacial Drift. There is here comparatively little gravel 

 to be seen. Aljout Kreischerville, where the plastic clay series 

 of the Cretaceous comes to the sm'face, the yellow sand and 

 gravel may be seen in limited quantity over an area of several 

 lumdred acres. At times I have seen the two drifts in contact 

 in the clay pits of this locality, the Glacial invariably upper- 

 most. 



The Geological Age of the Pre-glacial Drift. — The Pre- 

 glacial Drift of New Jersey has been exhaustively described in 

 the reports of the Geological Survey.* Over nearly all of this 

 State, south of the moraine, the yellow sands and gravels are 

 distributed in variable quantity, uniformly non-conformable to 

 the underlying strata. My interest in the formation has been 

 excited during work with Prof. Cook, and the reference to me 

 for examination of a group of fossil plants found in it. The 

 leaf-prints referred to are found near the city of Bridgeton, 

 Cumberland County, and have received considerable study. 

 The stratum bearing these leaf-impressions is a rather coarse, 

 soft sandstone — so coarse indeed, that the margins of the leaves 

 are often very indistinctly preserved, making it dithcult to 

 determine the outline. The primary venation, however, and 

 sometimes the finer subdivisions of the veins are easily seen. 



The identification of the species represented is not yet com- 

 pleted. Among the genera we have Liquidamhar, the sweet 

 gum, represented by several specimens of leaves resembling 

 those of the living species (Z. styraciflxia^ L.), but only three- 

 lobed, as occasionally seen on young shoots of that tree, and 

 thus resembling one of the Japanese species. Numerous speci- 

 mens of a Vih^irmiin, as showTi by the venation, which I have 

 called V. Bridgetonense, fragments of a broad-leaved grass, per- 

 haps Zizania ; serrated leaves of species of Vlmas and Car- 

 pinus ; leaves of one or more species of Oak, resembling 

 Quercus imhricaria,, two species of Magnolia., one of them 

 apparently identical with M. glauca^ the sweet bay ; one oi- 

 two specimens with the venation of Ceayiothus, and others yet 

 undetermined.! 



* Report on Clays, 1878 : Annual Rep., 1880, pp. 87-97, and Annual Rep., 

 1884, incl. 



t See Proc. A. A. A. S., 1882, Montreal Meeting, p. 357-359. 



