64 PROCEEDINGS OF THE PRINCETON MEETING 



projected south and north and is found to very closely coincide with the highest 

 shoreline features. 



The marine plane in the Connecticut Valley has the same gradient as the 

 marine plane in the Hudson Valley, 2.23 feet per mile, but the altitudes in the 

 former valley are 50 feet higher than those of corresponding latitudes in the 

 Hudson Valley. The isobases lie about 20° north of west by south of east. 

 The uplifted and tilted marine plane has altitudes approximately as follows : 

 Riverhead, Long Island, 120 feet ; New Haven, Connecticut, 180 ; Middletown, 

 220 ; Hartford, 260 ; Springfield, Massachusetts, 300 ; Brattleboro, Vermont, 420 ; 

 Hanover, New Hampshire, 565 ; Wells River, Vermont, 620. 



Presented in abstract without notes. 



Discussion 



Dr. J. W. Spencer: In confirmation of Professor Goldthwait's statement 

 that the Connecticut terraces rise in steps, it may be stated that I made an 

 investigation of these, as well as the terraces of the Lemville and Sal in 1895 

 and 1898; but the work has never been published except in a short abstract." 

 These valleys radiate west, east, and south from near the same highlands, yet 

 they all show that the terraces descend by steps and do not conform to the 

 valley slope, which features are not evidence of simple deformation or recent 

 tilting, as assumed by Professor Fairchild. 



Prof. W. N. Rice: I wish to call attention to a phenomenon near Middle- 

 town, which seems to be evidence of the view held by Woodworth in regard 

 to the terraces of the Hudson estuary and by Gulliver in regard to the ter- 

 races of the estuarian portions of the Thames and the Connecticut. Just below 

 Middletown, in Portland, between the high terrace and the river, is a well 

 characterized esker, first observed by Gulliver, whose crest is 30 to 50 feet 

 below the terrace. Apparently the terrace must have been formed while the 

 ice was still present in the valley. The great abundance of boulders up to 2 

 feet or more in diameter in the irregularly stratified material of the terrace 

 seems to point in the same direction. 



Prof. J. W. GoLDTHWAiT : Some of us who have worked recently in the field 

 shown on Professor Fairchild's map feel that in raising the level of the Pleis- 

 tocene sea from 525 feet at Covey Hill, where he formerly put it, to 750 feet, 

 and from zero at New Haven, where his predecessors had it, to 180 feet, he is 

 getting into deep water. Working toward Covey Hill, Canada, from the south 

 and west, Professor Fairchild has reached the conclusion that the upper limit 

 of marine submergence at that place is at 750 feet. Working toward Covey 

 Hill from the east and north, I have been led to place the marine limit at 525 

 feet, coinciding with the Gilbert Gulf water plane of Professor Fairchild. Our 

 failure to agree appears to be due in part to differences in observation of facts 

 at Covey Hill, as well as to their interpretation. 



In the Connecticut Valley it seems to me the evidence presented by Professor 

 Fairchild is too incomplete to warrant conclusions as to marine submergence. 

 One of Prof. James D. Dana's papers, to which he alluded, presents, however, 



isproc. Am. Asso. Adv. Sci., vol. xliv, 1896, pp. 139-140. 



