110 J. F. Kemp — Great Shear-zone in the Adirondachs. 



west of the lake is Mt, Mclntyre, on the east are Mt. Golden 

 and Avalanche Mts., which two are separated by the shear- 

 zone. The twin mountain is also called Mt. McMartin. The 

 lake and supposed dike were early discovered and recorded in 

 connection with the mining enterprise that was started at Lake 

 Henderson a few miles south.* The neighboring mountains, 

 Colden, McMartin, etc., were named from the promoters of 

 the mining enterprise. Redfield records that both the ex- 

 peditions were accompanied by one of the recently appointed 

 State geologists, the first by James Hall, and the second by 

 E. Emmons. 



The accompanying sketch has been traced directly from a 

 photograph, taken from a point of view across the lake. It 



sy?" — 



and the first micro-drawing were kindly made by Mr. Arthur 

 Hollick. A sketch which but remotely resembles the original 

 is given by Emmons in his report, p. 215 (also Ann. Rep. 1838, 

 Atlas, plate 1.) The two peaks are dome-shaped knobs of 

 massive rock, practically bare of vegetation and cleft from 

 base to summit by the so-called dike. The latter forms a 

 recess which is deeper at the lake than at the summit. At the 



* W. C. Rediield : Some account of two visits to the Mountains of Essex Co., N. 

 T., 1836-37, etc., this Journ., I, xxxiii. 301. Second Ann. Rep. N. Y. State 

 Survey, 1838, p. 225 ; Atlas plate IV. Emmons's Final Rep. on the 2nd Dist., 

 p. 215. 



