PLEISTOCENE MARINE SUBMERGENCE 4I 



the highlands. Here the upper Hudson waters built their delta, 

 the great terraced sand plain covering all the southwestern part 

 of the Glens Falls sheet and some of the Schuylerville. The 

 summit altitude of the marine waters in the Glens Falls district is 

 definitely shown by a series of strong gravel bars on the terrace 

 east of the mountain, with a height of 440 down to 415 feet. The 

 farmhouse of Mrs M. Hall stands on the terrace at 440 feet. The 

 house of Richard Denton is on a broad bar, the third below the 

 summit. 



As the land slowly lifted the Hudson extended itself to reach the 

 retiring waters, which carved the sand deposits into the cliff and 

 terrace so well shown southwest of Glens Falls, at 400, '380, 340, 

 320, 300, 280 and 260 feet. 



The latest deposits of the glacier in this district are found in 

 the moraine and kames north of Glens Falls, at the foot of the 

 highlands. During this phase of the waning ice it was faced by 

 the waters of the George valley, occupying the passes either side 

 of French mountain. The detritus from the land drainage was 

 •mingled with the glacial drift and outwash, together forming a 

 morainal tract of cobble and sand, holding kettles and lakes. Glen 

 lake and the neighboring " ponds " occupy the larger ice-block 

 kettles. These sand-cobble tracts were partially leveled by the 

 lowering glacial Lake George waters, down to about 460 feet, and 

 below that more effectively by the sea-level waters. The rolling 

 and knobby gravel tract north of Pattens Mills is typical of the 

 deposit of mixed origin. The coarser, hilly area about Glen lake 

 is more distinctly kame-moraine. The sand plain south of French 

 mountain, at 520 feet ; that about Rush Pond, at 500 and lower ; 

 and the kettle-plain at Bloody pond, west of French mountain, at 

 570 feet, represent the glacial George waters. The terraces in 

 the valley southeast of French mountain at 450 feet, and all the 

 lower plains and terraces are products of the estuary waters 

 (Woodworth's plate 14). 



The estuary, sea-level waters at their higher levels occupied the 

 valley of Lake George, through the pass east of French mountain. 

 Small deltas and other shore features will occur both sides of Lake 

 George at and below the surnmit marine plane. This plane is about 

 450 feet at Caldwell and about 540 at Ticonderoga. The features 

 are. mapped in paper 93. 



The Hudson-Champlain estuary, lay over the western part of 

 the Fort Ann quadrangle. Clifif cuttings in the shales have been 

 noted west of North Argyle. No close study has been made of 

 the rest of the area. Between Smith Basin and Fort Ann we see 



