PREVIOUS INTERPRETATIONS 517 



plained Round Lake and Saratoga Lake as ice-block depressions. He 

 states : "The simple and entirely sufficient explanation of Round Lake is 

 that it occupies an ice-block kettle." And : "The basin of Saratoga Lake, 

 like that of Round Lake, appears to be an ice-block depression." The 

 diversion of the Mohawk River from its northward course to its present 

 channel from Aqueduct to Cohoes Fairchild explained as the effect of 

 land-tilting. He states: 



'•It is apparent that the Iromohawk in the northward flow had sufficient 

 fall to have kept that path unless some, outside force intervened. The differ- 

 ential northward uplift supplied the interference. The northward flow was 

 weakened and discouraged and was diverted from the Ballston Lake channel 

 into the present narrow channel eastward toward Cohoes." 5 



A physiographic feature evidently -connected with drainage conditions 

 in late glacial times is that of the cove at Coveville, on the west bank of 

 the Hudson River. Woodworth explained this as connected with an old 

 channel of the Hudson west of Schuylerville. Describing the present 

 aspects of the channel as a "hanging valley/' he states : 



''The cove at Coveville, in its relation to this hanging valley, shows clearly 

 that a large stream at one time Mowed southward over the wall of the gorge 

 at this place into the main gorge of the Hudson River, and was arrested after 

 a slight amount of cutting had been accomplished. . . . The Hudson River 

 must have at one time flowed through this Coveville Valley at a time when the 

 bed of the river was in this latitude approximately 100 feet higher than it 

 now is." c 



~New Facts and Rediscussion 



general statement 



Both Saratoga Lake and Round Lake occupy depressions in bedrock, 

 as is shown by the occurrence of rock outcrops at the present margins of 

 both lakes. The greatest depth of Saratoga Lake, as determined roughly 

 by soundings, is 55 feet. This depth occurs just off Snake Hill, a mass 

 of folded rock on the southeastward border of the lake. The present ele- 

 vation of the lake is 204. feet, making the lowest portion of the bed of the 

 lake 149 feet above sealevel. The greatest depth of Round Lake is 27 feet, 

 the average of 12 soundings in different portions of the lake being 23 feet. 

 The present elevation of the lake is 188 feet, and, deducting 27 feet, we 

 have 161 feet as the lowest portion of the lake bottom. The Round Lake 



5 II. L. Fairchild : N. Y. State Mus. Bull. No. 195, pp. 14, 15. 



H. L. Fairchild : N. Y. State Mus. Bull. No. 195, p. 13. 

 J. B. Woodworth : N. Y. State Mus. Bull. No. 84, p. 19G. 



