PLEISTOCENE MARINE SUBMERGENCE 5 1 



Toward and at Shelter's Corners, northwest of West Beekman- 

 town, the delta stuff is shaped into a fine display of bar ridges. 

 Northeast of the corners the summit ridge is over 700 feet, and 

 between that crest and the three corners below 12 to 15 bars may 

 be counted in the drop to 580 feet. A mile north of Shelter's 

 Corners is a long ridge carrying a road, and wave action is shown 

 to the summit, 700 feet. Behind this ridge, on the west, is a smooth 

 hollow, over 20 feet deep, which was apparently a channel for the 

 latest flow when the ice front was building the ridge. Such smooth 

 channels somewhat beneath the static water level are to be expected 

 near the summit level where the glacier front was piling coarse 

 moraine stuff in bold ridges, that the waves could not later 

 demolish. Where there was little moraine drift, or drift of finer 

 material, the frontal stream channels might be more or less 

 obliterated. 



One and one-half miles west of West Chazy on the east-facing 

 slope the cobble bars are well developed. On the highway, the 

 Basset road, 10 to 12 bars are counted in the fall from 500 to 400 

 feet. This lower series of bars has about the relative vertical 

 position of the Franklin Center series in Canada, previously 

 mentioned. 



Cobblestone hill. This hill, described and illustrated by Wood- 

 worth (81, pages 32-35), is a good example of a moraine ridge 

 modified in form by wave work. Lying detached, a mile north of 

 the Basset road, and with conspicuous, bare, cobble bars crossed by 

 the road, it was the subject of special notice. The top and east 

 slope were handsomely shaped into bars of well-rounded cobble. 

 The summit bar was 665 feet altitude, the lower bars ranging down 

 to 580 feet. The summit was at least 50 feet beneath the highest 

 stand of the Champlain waters. In recent years a reservoir has 

 been built on the west of the hill and the summit cobble bar has 

 been entirely destroyed for concrete material. This removal shows 

 that the cobbles were only a veneer for a block moraine ridge (see 

 plate 19). Cobblestone hill is not unique, but an example of 

 the moraine ridges more or less modified by wave action. The 

 occurrence of such a large quantity of uniform cobble on the 

 detached hill is, however, a puzzle, and suggests that there may be 

 some unknown factor in the history of the ridge. 



The character of the Altona channels suggests a larger stream 

 flow than merely that of the local waters, the Chazy rivers and the 

 glacial outflow. The eastward position of the Altona highland 

 seems to make it quite certain that the Altona channels carried the 



