New York State Education Department 



New York State Museum 



John M. Clarke, Director 



Bulletin 115 

 GEOLOGY 14 



GEOLOGY OF THE LONG LAKE QUADRANGLE 



BY 



H. P. CUSHING 



ACKNOWLEDGMENT 



A portion of the field work, on which the following report is 

 based, was done in conjunction with the topographers of the 

 United States Geological Survey, while they were mapping the 

 district. In country of this kind, where accurate location of out- 

 crops is by no means the least of the difficulties under which the 

 geologist labors, combined work of the sort is highly advantageous, 

 since the topographer locates the geologist's outcrops for him, 

 and that with a high degree of accuracy. The arrangement was 

 highly advantageous to the State Museum, as well as to the writer, 

 and he wishes to express his hearty acknowledgments to Mr H. M. 

 Wilson, whose permission made the arrangement possible, and 

 to Mr J. M. Whitman jr, and Mr A. P. Meade jr, for a vast number 

 of courtesies, and a very helpful and pleasant field season. 



SITUATION AND CHARACTER 



The Long Lake quadrangle comprises that part of the Adirondack 

 region lying between parallels 44° and 44 15' n. latitude, and merid- 

 ians 74 15' and 74 30' w. longitude, its area being slightly over 218 

 square miles. If the Adirondack region is understood to comprise 

 the entire district of the north woods, then this quadrangle lies 

 about midway, or in the heart of the district. It is however situ- 

 ated on the western border of the more rugged portion of the 

 area, that included in the Adirondack mountains proper. 



The quadrangle is noteworthy for the variety of topography 

 presented. The main axis of elevation of the region crosses it, 



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