GEOLOGY OF THE WEST POINT QUADRANGLE, NEW YORK 89 



road metal, is produced at Tompkins cove in very large amount. 

 It has also been produced at Verplanck point and in former times 

 some production was furnished from the lona Island gneiss and 

 from the Storm King granite at Storm King mountain. None of 

 these is now active except the Tompkins cove plant. 



Possibilities of producing any quantity of granite gneisses and 

 similar rock are very good indeed, but it does not appear that the 

 quality of material produced for this purpose from such sources 

 can compete with the stone already in the market from the trap 

 formations and the siliceous limestones. It is possible that some of 

 the quartzites may furnish a particular quality, but these have not 

 been tried out and as far as known, they do not promise a quality 

 superior to the trap in any case. As long, therefore, as trap supplies 

 are obtained at a moderate price, it is not likely that any of these 

 possible sources will be used extensively. They undoubtedly will 

 be used locally for many purposes and especially for road building. 

 This quadrangle, in short, contains its own structural material for 

 all sorts of building and construction purposes but does not promise 

 any considerable supply to the stone market. 



Clay. Clays are developed along the Hudson river in considerable 

 quantity, hut the workable deposits are chiefly beyond the limits of 

 this quadrangle. The large Haverstraw brick plants lie just south 

 of this quadrangle and others of similar sort occur to the north. 

 One at Dutchess Junction in the northwest comer of the quad- 

 rangle is worked on a large scale. Smaller amounts occur on 

 Verplanck point on the south. The origin of these is the same as 

 the well-known Hudson River clays connected with the close of the 

 glacial period. The quality is suitable for common brick manufac- 

 ture. No large industry could be established, however, within the 

 limits of the quadrangle except such development as the deposits 

 near Dutchess Junction will afiford. 



Water, The region has a rainfall of 48 inches and the streams 

 from the mountainous and sparsely settled portion of the region 

 furnish excellent water for all ordinary uses. Some of these are 

 used locally as water supply for such places as Peekskill. Local 

 supplies for farms or individual use are not difficult to secure in 

 most districts by wells. 



No water of extraordinary quality is known within this region. 

 An occurrence of rather surprising behavior, however, has been 

 encountered on Foundry brook not far from Nelsonville above Cold 

 Spring. Here a boring put down through the drift and into rock. 



