'J2. NEW YORK STATE MUSEUM 



existence of many sand flat delta or lake deposits makes it practi- 

 cally certain that this was a very extensive lake. It extended 

 northward up the Schroon river as a long, narrow body of water 

 at least as far as North Hudson, with a branch extending eastward 

 to form an enlarged Paradox lake. Southward from Pottersville, 

 all the lowland (below the 880 foot contour) southward to South 

 Horicon and Meade pond (south of Chestertown) was occupied 

 by the lake, with a prominent branch extending northeastward 

 over the Brant lake area, and a smaller branch over Valentine 

 pond. Another branch appears to have reached northwestward 

 from Chestertown over the Loon lake area, though this is not quite 

 so certain. The dam which held this water at so high a level was 

 quite certainly one of glacial drift across what is now the deep, 

 narrow channel of Schroon river i mile south of South Horicon. 

 It is important to note in this connection that the boulder moraine, 

 above described, crosses the river here. The Schroon lake reser- 

 voir, which may some day be built by the State by means of an 

 artificial dam across the river at this same point, would largely 

 restore the former lake. 



Sand terraces around Brant lake, especially toward the east end 

 along Mill brook, prove the former higher water level of that 

 lake. Around Loon lake there are suggestions of lake deposits 

 about 10 or 15 feet above the present water level but they are not 

 very decisive. In the immediate vicinity of Chestertown and one- 

 half of a mile west of Starbuckville, there are waterlaid sands or 

 sand flats reaching altitudes of about 880 feet as nearly as can be 

 judged from the contour lines. At Pottersville the delta material 

 lies at from 880 to 900 feet; north of Schroon lake village up to 

 920 feet; and at North Hudson (Paradox lake sheet) up to 960 

 feet. Between Schroon lake village and North Hudson there is 

 an almost continuous succession of such terraces along Schroon 

 river, with gradually increasing altitudes toward the north. The 

 rate of increasing northward elevation of these old lake delta de- 

 posits is in almost perfect harmony with the figures given by Pro- 

 fessor Woodworth for the warping of the Lake Champlain ter- 

 races. As stated on page 66, the rate of northward increase at 

 the latitude of Schroon lake should be about 3^ feet a mile. The 

 altitude of the terraces at Chestertown is 880 feet; at Schroon 

 Lake village 920 feet; and at North Hudson 960 feet. This is a 

 total difference in altitude of 80 feet in the distance of 22 miles 

 from Chestertown to North Hudson, or at the rate of 3.6-f- feet 



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