646 II. L. ALL1NG GLACIAL LAKES OF CENTRAL ADIRONDACK^ 



Page 



Lower Jay Lake 662 



Otis Lake 663 



Rocky Branch Lake 663 



Clifford Lake 663 



Styles Lake 663 



Wainwright Lake 663 



Clintonville water level 663 



Keeseville water level 664 



Elizabethtown group 664 



General observations 664 



Rhododendron Lake - 664 



Bouquet Lake 664 



Branch Lake 664 



North Hudson Lake i 665 



Lake Pottersville 665 



Split Rock Lake , 666 



Elizabethtown Lake 666 



Black River water level 667 



Summary of the glacial lake succession 667 



Keene Valley group : 667 



Elizabethtown group 66S 



Post-lacustrine deformation 66S 



General discussion 66S 



Deformation chart for the Keene Valley group. 669 



Explanation of chart 669 



Index to chart 671 



Postscript 672 



Introduction 



In his presidential address before the Geological Society of America, 

 delivered December 28, 1912, Professor Fairchild introduced his subject, 

 "The Pleistocene Geology of New York State/' by remarking that "in 

 variety and excellence of Pleistocene phenomena New York State prob- 

 ably excels any other equal area of the earth's surface." 1 



This being so, it is regrettable that the large area occupied by the 

 Adirondacks should still be inadequately shown on our maps of Pleisto- 

 cene geology. In the central area of this region, especially the Mount 

 Marcy, the Lake Placid, the Ausable, and the Elizabethtown quadrangles, 

 have not yet received the attention they deserve; for while the mapping 

 of the rocks has, apparently, been done with considerable thoroughness, 

 the glacial geology has been generally overlooked, although in the acces- 

 sible valleys it is so clearly discernible that "he who runs may read." 



1 H. L. Fairchild : Bull. Geol. Soc. Am., vol. 24, p. 134. 



