GLACIAL GEOLOGY OF THE SCHENECTADY QUADRANGLE 



23 



transported materials (sand, gravel and small cobbles) in places on 

 the surface of the previously eroded clays, as seen in the section 

 above described. 



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Oc 



Bed rocK 



Till 



Clays 



Sands Flood gravel 



Fig. 3 Diagrams showing successive stages in the formation of Round lake depression. The 

 first diagram shows the depression as formed prior to the glacial epoch; the second diagram shows 

 the conditions after the melting of the ice when glacial till had been deposited on the floor and 

 slopes of the depression; the third diagram shows the conditions when Lake Albany was at its 

 height, clays and sands having been deposited, filling the depression; the fourth diagram shows 

 present conditions as resulting from erosion and the deposition of flood gravel. 



