l6 NEW YORK STATE MUSEUM 



originally. The subsequent sculpturing then developed its present 

 form. 



From the outlook tower at Cold Spring park on the south one 

 looks into the gorge, but from the summit on the north side the 

 most impressive view is obtained. 



Drainage. The larger features of structure which have just 

 been remarked in the review of the ph3^siography have been the 

 chief factors in locating the lines of drainage. The glacial deposits 

 have in a minor but still recognizable way also exercised an im- 

 portant influence. 



The chief streams are two, the Schroon river which drains the 

 southwestern portion and which passes to the Hudson; and the 

 Boquet and Black, rivers which drain the western and northern 

 portion, combining as the Boquet, to enter Lake Champlain. Be- 

 tween the Schroon and the Bocjuet, Mill brook with its mouth at 

 Port Henry and Hoisington brook at Westport are the chief 

 streams. Along the shore, however, a number of additional but 

 smaller ones run from the mountains directly into the lake. 



The Boquet river after its junction with the Black and after some 

 meanders across the drift, leaves our map at the 270 contour. The 

 Schroon river is higher and passes to the southward just below the 

 9C0. The divide or col between the two stands at 1130 feet. The 

 divide is a rather important one in that it marks the boundary be- 

 tween the St Lawrence and the Hudson drainages. Roughly speak- 

 ing about one fifth of the area discharges through the Schroon 

 river to the Hudson ; the remainder sends its waters to the St 

 Lawrence. 



At the headwaters of both the Schroon and the Boquet are some 

 extremely interesting features which also extend into the neigh- 

 boring quadrangles. The marked northeast and northwest struct- 

 ural lines have caused even the little brooks to follow them. We 

 may start at the source of some little tributary, such as the Moss 

 ponds, southwest of Underwood, and follow the stream around 

 three sides of a rectangle, each turn being a sharply angular one. 



This peculiar arrangement of the streams, although observed by 

 the writer at the outset of field work, also independently attracted 

 the notice of Prof. A. H. Brigham during a study of the maos, 

 so that the first mention of it in print is from his pen in an article 

 entitled '' Note on Trellised Drainage in the Adirondacks " in 

 the American Geologist, 1898, volume 21, page 219. 



The trellised drainage is believed by the writer to be due to a 

 pronounced system of block faulting which has broken up the 



