May 1906] PROCEEDINGS S. I. ASSN. ARTS AND SCIENCES. 6q 



about 650 feet. On Plate II is depicted a map of Long Island and 

 vicinity on which the surface locations of the flowing wells are indica- 

 ted and those of equal depth are connected by lines, thus producing- a 

 series of curves of equal depth ; and these curves are theoretically ex- 

 tended across the lower bay and the south shore of Staten Island into 

 New Jersey, where they are connected with similar curves of known 

 equal depth. This map and the conclusions to be drawn from it are of 

 special interest to us in connection with the problem of our local water 

 supply, inasmuch as the south shore of Staten Island, from the Narrows 

 to Princes Bay, is included between the theoretical 200 and 300 feet 

 curves. It is well known that the same Cretaceous deposits, at least 

 in part, extended from New Jersey through Staten Island to Long 

 Island, and the facts now brought to light in this paper strongly indi- 

 cate that, unless some local conditions obtain which are not apparent, 

 the water-bearing Lloyd sand ought to be found in this region at a 

 depth of 200-300 feet below sea level. 



The probable presence of this water-bearing horizon has been fre- 

 quently mentioned in connection with our local water supply problem, 

 and it is interesting to recall that a calculation of its theoretical depth 

 below sea level was made some years ago, before the Long Island data 

 had been obtained, and that this calculation gave a depth of 280-312 feet 

 {Proc. Nat. Set. Ass'n S. /., vol. vii. p. 19, June 10, 1899), which is 

 exactly that now indicated under the authority of the United States 

 Geological Survey. — A. H. 



The meeting then adjourned. 



