20 NDW YORK STATE MUSEUM 



COLOR SCHEME 



The colors and patterns used for the expression of the geo- 

 logic formations are as nearly as possible those adopted by the 

 United States Geological Survey in its geologic maps. The 

 adjustment of these conventions to so large a map has proved 

 quite difficult, yet it is sufficiently close to be clearly intelligible 

 to those familiar with the system in question. 



ACKNOAVLEDGMENTS FOR MATERIAL, USED 



The space necessary for a detailed acknowledgment of 

 material used in the present edition of the geologic map of New 

 York is so great that it was found impracticable to engrave it 

 all on the map itself. In the following pages, therefore, a de- 

 tailed acknowledgment is made for all material used. 



LIST OF COXTRIBLTING GEOLOGISTS AVITH COUNTIES I\ WHICH 



THEIR CONTRIBUTIONS LIE 



New York 

 Bishop, I. P. Erie. 



Clarke, J. M. Albany, Allegany, Broome, Cattaraugus, Cay- 

 uga, Chautauqua, Chemung, Chenango, Columbia, Cortland, 

 Genesee, Herkimer, Livingston, Madison, Monroe, Oneida, Onon- 

 daga, Ontario, Otsego, Schuyler, Seneca, Steuben, Tioga, Tomp- 

 kins, Wyoming and Yates. 



Cumings, E. R. Schenectady. 



Cushing, H. P. Clinton, Franklin, Herkimer and St Lawrence. 



Dale, T. N. Rensselaer and Washington. 



Dana, J. D. Columbia and Rensselaer. 



Darton, N. H. Albany, Greene, Ulster, Orange, Saratoga, 

 nerkinier, Fulton, Hamilton and Montgomery. 



Davis, W. M. Columbia and Ulster. 



Dwight, W. B. Dutchess and Columbia. 



Eckel, E. C. Westchester, Putnam, Dutchess, Rockland, 

 Orange, Oneida, Seneca and Yates. 



Finlay, G. I. Essex. 



Ford, S. W. Columbia. 



