﻿270 NEW YORK STATE MUSEUM 



this point eastward — from Norfolk street nearly to the East river — 

 the Fordham gneiss with many interbeds of limestone forms the 

 rock floor. 



As much of this detail as it is now possible to classify has been 

 included in the accompanying drawing, plate 38, in which special 

 attention has been given to the interbedded limestone occurrences. 



In view of the fact that a tunnel is finally to be constructed 

 through this section which will cut the whole series of formations 

 and structures at a depth probably between el. -600 and -700 feet, 

 it is clear that much greater accuracy of geologic interpretation 

 is soon to be attainable on many of the more obscure points. Be- 

 cause of this also it is not advisable to attempt a detailed structural 

 cross section at the present time. It can very well await the more 

 complete data to be gathered during construction of the tunnel. 



