GLACIAL GEOLOGY OF THE SARATOGA QUADRANGLE 



25 



the melting ice bore a part in the distribution and sorting of the 

 finer materials. In places they transported the sands beyond the 

 edge of the ice, building outwash plains. 



The difference in composition between the western portion of the 

 morainic belt and that farther east may possibly be accounted for 

 as follows : North of the western end lies the old erosion channel 

 now forming the general valley of the Hudson from Corinth north- 

 ward. The soils and materials of sedimentary origin which had 

 accumulated on the floor of this channel in preglacial times were 

 dragged or inclosed and transported by the glacial ice and contrib- 

 uted to the materials of the moraine. The portion of the belt far- 

 ther east was beyond the range of accession from this source. Its 

 materials were the soils and broken fragments of rock from the 

 uplands region to the north of this portion of the moraine. The 

 rugged surface of this region was favorable to the detachment of 

 fragments of the bedrock and many of these as indicated by their 

 angularity, were derived from not distant localities. 



The outwash plains. South of the western end of the moraine 

 and marginal to it is a broad plain traversed by Sturdevant creek 

 and extending southward to beyond South Corinth station.. This is 

 unquestionably a plain of aggradation. Its materials are sands and 

 gravels more or less stratified in arrangement. At a point a short 

 distance south of South Corinth station, Kayaderosseras creek has 

 eroded its bed to a depth of 12 feet below the general surface. The 

 materials of the plain thus exposed consist of definitely stratified 

 sands and fine gravels. In places, layers of coarse gravels are seen 

 with some pebbles an inch in diameter. The layers are of uneven 

 thickness and limited in horizontal extent. In places, a cross-bedded 

 structure is seen. 



2000. 



mm 



Bedrock 



Till 



Kame Terrace 



Outwash Plain 



Fig. 3 Cross-section in the locality of South Corinth. Horizontal scale, 

 1 inch = 1 mile; vertical scale, 1 inch ^1600 feet. The surface line is 

 drawn to- scale; the thickness of the deposits is theoretical. 



