REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1901 rll 



irregularities of the ice may have been such as to make tem- 

 porary lakes along the ice front between the ice and the 

 moraine. The failure of anything like wave action on the sea- 

 exposed side of the moraine at Staten island at the 35 to 40 

 foot level is presumptive evidence that the water body existed 

 only on the north side and thus favors the temporary lake view. 

 The decided falling off in level of these sand plains stage by 

 stage from Perth Amboy to Englewood and next at Tappan in 

 New York indicates either a progressive rise of the land as the 

 ice retreated or a lowering of impounded water by the down 

 cutting of the morainal barrier and the melting of outlying ice 

 masses in the present kills communicating across the moraine. 



A further examination of the sand pits near Roslyn on Long 

 island disclosed in the till bed beneath the moraine certain 

 glacially transported boulders which appear without doubt to 

 have journeyed from the Adirondacks. These fragments so far 

 as now known afford the evidence of longest transportation in 

 the eastern part of the State. 



An examination was also made of certain fine silty deposits 

 in the Bronx and within the built up district of New York city 

 to determine their origin and if possible the time of their deposi- 

 tion. While their subaqueous deposition must be admitted as 

 possible, it seemed to Professor Woodworth, from the character 

 of their topography and the occasional scattering over their sur- 

 face of glacial erratics, that these deposits belong to a time prior 

 to the retreat of the glacier and thus are not to be correlated 

 with the so called Champlain depression which followed the dis- 

 appearance of the ice. 



In the area of the Schuylerville and Saratoga atlas sheets 

 numerous facts were obtained concerning the altitude of the 

 Albany clays, the deltas of streams and the position of the melt- 

 ing ice sheet and its minor moraines, all of which observations 

 served to make more definite the history of the ice retreat and 

 thus the knowledge of the extent of open country covered by 

 water during the deposition of the clays. It was ascertained 

 for instance that the Adirondack portion of the Hudson 



