NEW FACTS AND REDISCTJSSION 523 



Mohawk waters that formed the valley from Grangerville to Coveville 

 which was regarded by Woodworth as an abandoned valley of the Hudson 

 Eiver. The recess at Coveville and the depression of the Coveville inlet 

 were formed by the plunging waters of the glacial Mohawk as they fell 

 over the rock wall of the Hudson gorge. 



In Woodworth's interpretation the "old hanging channel" had its 

 northern connection with the valley of the Hudson at Northumberland. 

 To the writer it seems that the depression at 220-240-foot elevation, ex- 

 tending northeasterly from Grangerville to Northumberland, was for a 

 time occupied by Iroquois-Mohawk currents, which found an exit to the 

 Hudson Valley in that course. The depression is now till-covered and 

 the hills, rising on either side to the 300-foot level, are also till-covered. 

 It appears that the glacial Mohawk waters, at that stage in the subsidence 

 of Lake Albany when the Coveville delta had emerged as land surface, 

 may have spread over this depression and established a course to the 

 Hudson Valley at Northumberland, thus lowering the surface of the till 

 and producing the present channel features. At the same time a portion 

 of the waters forced an outlet toward Coveville, and that channel was 

 eventually reduced by erosion to an extent that the northward channel 

 was undercut. The present broad depression extending southeasterly to 

 Coveville was then developed as the bed of the Iroquois-Mohawk. 



In postglacial times the course of Fish Creek has been shifted from 

 that portion of its former channel which extended southwest from Victory 

 Mills toward Coveville to its present channel, past Victory Mills to its 

 outlet in the Hudson at Schuylerville. This portion of Fish Creek is 

 clearly postglacial in origin, as is evidenced by the fact that it occupies a 

 rock gorge and by the fall of about 100 feet from south of Victory Mills 

 to its mouth, a distance of about iy 2 miles. It seems probable that this 

 change of course of Fish Creek is a case of stream piracy. A small stream 

 that flowed down the slope past Victory Mills, through headward cutting, 

 tapped and diverted to its course the Fish Creek currents at the place in 

 its bed where the sharp bend occurs, southwest of Victory Mills. 



DEVELOPMENT OF THE BOUND LAKE-ANTHONY KILL CHANNEL 



The Iroquois-Mohawk waters continued to course through the Saratoga 

 Lake-Fish Creek Channel until such time as a lower outlet to the Hudson 

 Valley by way of the Bound Lake- Anthony Kill Channel of sufficient 

 capacity to contain the entire volume of the Mohawk waters was estab- 

 lished. That the Mohawk waters flowed through the latter channel there 

 is convincing evidence. The valley which extends from the floor of 

 XXXV — Bull. Geol. Soc. Am., Vol. 33, 1921 



