GLACIAL GEOLOGY OF THE SARATOGA QUADRANGLE 47 



plain south of Corinth and by the areas of sand and gravel on either 

 side of the Hudson river southeast of Palmer. 



When the ice front had receded as far as Corinth the two lakes 

 became confluent. The outlet stream of the lake which had previ- 

 ously stood at the lower level (although the difference in level 

 was not great, since the deposits have approximately the same ele- 

 vation in both, namely, 640 to 660 feet) became now the outlet of 

 the common body of waters. This condition of things lasted until 

 the ice front had further drawn back to the north as far as Luzerne. 



When, through the melting of the ice, the mouth of the Sacandaga 

 river had been opened, a great volume of the waters gathered from 

 the drainage basin of that stream and from the dissolving ice to 

 the north poured into Lake Corinth at its northern end, in the 

 locality of Luzerne. The rush of waters, sweeping through the 

 long and narrow lake, produced flooded conditions which prob- 

 ably reestablished the outlet stream of the lake which at the time of 

 the junction of the two lakes had become inoperative. The currents 

 coursing southward from Corinth washed and eroded away a 

 portion of the morainic dam and, as a flooded river, eroded a broad 

 channel through the heavy mantle of till, in places to bedrock, and 

 discharged into Lake Albany at West Milton, building the delta 

 now represented by the Milton plain. 



Two facts of general interest are deducible from the Milton 

 plain: (1) that the subsidence of Lake Albany did not begin until 

 after the ice sheet had retreated as far north as* Luzerne and such 

 time thereafter as was required to build the Milton delta; (2) 

 that postglacial deformation at the rate of 2.y 2 feet a mile, north- 

 ward uplift, has taken place, as shown by comparison of the present 

 elevations of the Milton plain and the Mohawk delta plain at 

 Schenectady. 



With the passing of the flooded conditions, the level area south 

 of the moraine became aggraded to its present level at South 

 Corinth, causing the river to follow the lower channel from Corinth 

 eastward. 



The subsidence of Lake Albany marked the closing stages of the 

 glacial period. With the emergence of the Milton plain as land 

 surface, Kayaderosseras creek developed its present channel from 

 West Milton to Ballston Spa, there discharging into Lake Albany. 

 When such further lowering of the lake waters had taken place 

 as to lay bare the sands deposited broadly in Lake Albany at the 

 320 foot level, Kayaderosseras creek further extended its course, 



