I02 NEW YORK STATE MUSEUM 



By others, the lower level at the north has been attributed to 

 erosion accompanying elevation, and the coarser sediments to the 

 same cause. 



C. E. Peet^ has made the observation that, if the valley between 

 the low terrace just south and north of Carthage Landing and the 

 slightly higher one on the west of the river at Roseton and Dans- 

 kammer were filled with ice, the latter was stagnant, and may have 

 stood on the lower terrace at the east. He also admits the possibility 

 that the terraces may have been continuous and that the lower one 

 on the east is the product of the erosion of higher deposits. 



Later, in discussing the history of the " Hudson water body and 

 the successive positions of the ice as it retreated through the Hud- 

 son valley, Peet- states that the ice front appears to have assumed 

 two distinct phases in difi^erent parts of the valley. In some parts, 

 notably the narrower ones, it is believed that the ice protruded down 

 the valley and that accumulations took place at the edge of this 

 ice-tongue, or between it and the valley wall. The deposits at 

 Carthage Landing and New Hamburg might represent such con- 

 ditions, but the valley ice was probably not an active contributor, 

 although at the latter place waters from the valley ice may have 

 been active in the early stages of the plateau building. In the 

 broader parts of the valley the deposits were probably deposited in 

 an embayment of the ice front. 



Peet cites many facts to show that the Hudson water body may 

 have been a lake made by a barrier at the south, or a succession of 

 lakes made by a succession of barriers or by a migrating barrier, 

 and, on the whole, leans toward the lake hypothesis as against a 

 salt water body. The reader is referred to the original paper 

 (see loc. cit. p. 640-56). 



It is probable that a series of glacial lacustrine basins at the south 

 would have allowed both for open water and the many characteristic 

 glacial phenomena in connection with the deposition of this 

 material. 



On the submergence hypothesis an elevation of between 100 and 

 150 feet was necessary for the bisection of the delta at New Ham- 

 burg, and at this time the deposits in the gorge of the Hudson may 

 have been dissected, although to a greater extent in the case of the 

 main river. The moot point seems to be the extent to which the 

 gorge was submerged by the sea. 



1 Journal of Geology. 12 :445. 



2 loc. cit., p. 618-21. 



