BULLETIN No, 17 NEW YORK. STATE MUSEUN 



ACKNOWLEDGMENT 



The boundaries of the granite and gneiss and of Ihe Calclferous-Trenton 

 bmestone in , the vicimty of the Mohawk Valley, and the outcrops of the Niag- 

 ara and Helderberg hmeslones are from the Preliminary Geologic map of 

 NewYork prepared under the direction of James Hall. LL.D..by W I McGee 



The outcrop of the Tully limestone is from the work of S. C Williams' 

 6th Annual Report. Stale Geologist of NewYork. 



The Calciferous-Trenton limestone outcrops in the St. Lawrence and 

 Champlam Valleys and in the region east of the Hudson River as well as 

 in Ulster and Orange Counties ; the areas of granite, gneiss and trap in 

 southeastern NewYork, and the north boundary of the Adirondack granite 

 and gneiss area, are from the Economic and Geologic map of New York 

 compiled by r. J. H. M — : " 



