520 J. H. STOLLER HISTORY OF MOHAWK-HUDSON REGION 



area of sand at the same elevation west of Saratoga Lake and separated 

 from the Saratoga plain by a broad water-swept depression. In its origi- 

 nal eastward extension the delta probably covered the area which now in- 



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7V»-.-.v.*.-.v.,.).i-li'/ 



3alls"fco« 5b«v? 



Figure 1. — Sketch Map of the lower Mohaivk- middle Hudson Region 



Showing the present drainage features and indicating the several courses of the Iro- 

 quois-Mohawk River in late Pleistocene times and the deltas formed. The deltas at Sche- 

 nectady, north of Ballston Spa and at the mouth of Hoosic River were formed when Lake 

 Albany was at its greatest development. The other deltas were formed at successive 

 stages in the subsidence of the lake waters, as explained in the text. 



