6 NEW YORK STATE MUSEUM 



Elizabelhtown next east of it and the Port Henr}', on the lake shore, 

 He betv/een. The Lake Placid sheet is north, the Santanoni west 

 and the Schroon Lake south. The geology of the area of the Mount 

 Marcy sheet has already been described in a preliminary way and 

 with small scale maps, but since these little reconnaissance maps 

 were issued, much more detailed field work has been done leading 

 to the present report. The geology of the Elizabethtown and Port 

 Henry quadrangles is described in detail in Bulletin 138 by the 

 present writer and Dr R. Ruedemann; and the Paradox Lake quad- 

 rangle lying to the southeast is covered in a preliminary way by 

 the maps and text of Bulletin 96 by Dr L H. Ogilvie. The nearest 

 quadrangle on the west which has been mapped is the Long Lake, 

 whose geology is set forth by Prof. H. P. Gushing in Bulletin 115. 

 On the south, the Schroon Lake quadrangle, has been mapped by 

 Prof. W. J. Miller in Bulletin 213-214. To the north is the Lake 

 Placid sheet mapped by Prof. W. J. Miller, in Bulletin 211-212.^ 



Physiography 



In the broad features of its relief the quadrangle embraces a 

 series of northeast and southwest mountainous ridges separated by 

 rather narrow valleys. While these features appear from a study 

 of the contour map, or better yet by observation of the country 

 from some lofty summit, yet its most important depression, the Keene 

 valley of the summer visitor, is almost due north and south, and 

 the northwestern portion, containing the historic grave of John 

 Brown, is practically a sandy and gravelly plateau on the 2000- foot 

 contour. On the south, too, the valley of Elk lake, rather broad, 

 open and flat, is continued almost due south down the course of 

 "The Branch." 



1 The field work on which the present bulletin is based was begun in ihe 

 summer of 1893 with Heinrich Ries as companion. Reconnaissance maps 

 were prepared by townships on the basis of a county atlas, and were sub- 

 mitted with brief descriptions to Prof. James Hall, then State Geologist. 

 In 1897 after preliminai^y copies of the topographic sheet were available 

 more detailed work was done under the auspices of the United States 

 Geological Survey, which later turned over the results to the New York 

 survey. Upon this latter work the writer Vv'as accompanied by Charles H. 

 Fulton. Four shorter trips have heen made into the Keene valley in the 

 intervening years to clear up obscure points. Acknovv'ledgments are due the 

 United States Geological Survey and Messrs Ries and Fulton. In 1914, 

 1915 and 1919 valuable aid was received from Harold L. Ailing, at first a 

 student at the University of Rochester and later at Columbia University but 

 a summer resident in the Keene valley. The results of Mr Alling's studies 

 of the Pleistocene lakes and deltas form a separate chapter toward the close 

 of the bulletin. A second chapter on the reaction rims of garnets has been 

 kindly contributed by Max Roesler, based on work begun under the writer's 

 direction at Columbia University and completed at Yale University. 



