• 



James Hall, State Geologist. 



Sik :— The accompanying paper gives a detailed account of the rock 

 sections at various localities in the West Canada creek and Mohawk river 

 valleys. The results obtained serve to show that the Calciferous sandrock 

 and Utiea slate have a much greater thickness than that noted in previous 

 descriptions of these formations. 



Respectfully yours, 



CHARLES. 8. PROSSER, 

 EDGAR R. CUMINGS. 



Union College, Schenectady, N. Y. 



617 



