8 NEW YORK STATE MUSEUM 



sea-level waters grade up into those made in glacial waters, and 

 close discrimination has not A^et been attempted. A large glacial 

 lake occupied the basin of Lake George and the district south of 

 French mountain, with its outlet along the east face of Luzerne 

 mountain. The group of lakes south of French mountain occupy 

 ice-block kettles in a stretch of kame-moraine that was built at the 

 border of the ice lobe which blocked the Lake George vaUey. The 

 sea-level waters entered Lake George basin through the pass east of 

 French mountain. The kettles have been mapped by Woodworth 

 (4, plate 14). 



The Hoosic delta has been described by Woodworth (4, pages 134. 

 200, plate 10). Professor Stoller has mapped the northern part of 

 the Schenectady delta (7), and the present writer has mapped the 

 southern part (14, plate 6). 



SUMMIT SHORE LLNE 



Abundant phenomena mark the highest stand of the waters; 

 being the ordinary shore-line features, gravel bars, cliffs and deltas. 

 The beach phenomena, gravel bars and wave -cut cliffs, are not 

 commonly conspicuous, as they require for strong development a 

 combmation of conditions, and usually the stimmit waters along 

 the sides of the valley were either too shallow, too secluded, or without 

 sufficient coarse material for bar-building. A few good gravel 

 embankments are indicated on the map. A splendid summit-level 

 bar lies 5 miles southeast of Fort Edward and 2 J miles south of 

 Durkeetown. North of this great gravel bar, which carries a ridge 

 road, are several fine erosion cliffs at inferior levels. The lowest 

 cliffs and terraces, a mile south of Dtirkeetown, with an altitude 

 of 300 down to 260 feet, Woodworth took as the summit water 

 level (4, page 138, plate 12). The big bar is 425 feet above tide and 

 is over 10 feet below the theoretic summit level. The hills in this 

 district are Cambrian black slates, with northeast-southwest shaping 

 due to ice molding. They are rocdrumlins. Below the summit 

 marine plane the west exposure sides are swept clean and facetted 

 by wave wcrk, with prevailing horizontal lines. Above about 

 440 feet, or 450 at North Argyle, the surface has an aspersity or 

 roughness quite wanting below. 



Another group of rocdrtimlins lies east and northeast of Saratoga 

 lake, also ncted by Gushing (8, page 14). The northern hills of this 

 group, near Fish creek, stood as islands in the sea-level waters and 



