TABULATION AND DRSCRTPTION OF NEW DATA 



209 



For Vermont some new data is given below, descrij^tion of the details 

 being reserved for the report of the State Geologist. At Bradford massive 

 clay reaches np to 600 feet, to within 50 of the summit sand-plains. The 

 features here, as at man}^ other points in the valley — Brattleboro, White 

 River Junction, Norwich, Lewdston, and Hanover, New Hampshire — are 

 on the sides of the open Connecticut Valley, with no relation to any 

 possible glacial waters by lateral ponding. 



In New Hampshire several localities have been examined with definito 

 results. Good bars and other features along the south side of Lake Win- 

 nepesaukee definitely locate the 600-foot isobase. Through the Saco 

 Valley the sealevel waters reached into the White Mountains as far as 

 Bartlett, where clear features are found south, west, and northwest of 

 the village (see plate 10). 



Eastern Massachusetts and Ehode Island have not yet been examined 

 by the writer. Most of the area is beneath the summit marine plane, as 

 shown by the topographic sheets, but a few hills should preserve records 

 of the highest wave-work, and a few streams from higher ground will 

 probably exhibit the summit deltas. The topographic sheets lack suffi- 

 cient relief expression to indicate the summit sand-plains. As a whole, 

 the region must be difficult for this stud}^, one proof of which is the fail- 

 ure of students to recognize the initial or summit marine level. Prob- 

 ably the delta plains, which have been attributed to glacial waters (70, 

 71, 73, 75), were mostly built in the lower levels of the marine waters. 

 The fine succession of sand-plains in the Sudbury Valley described by 

 Goldthwait (75) is the condition to be expected in the slowly falling 

 marine waters, but is very unusual in glacial lakes. The later level of 

 Crosby's glacial waters in the Nashua Valley (370 feet) probably repre- 

 sents the summit marine level. 



Altitudes of the earliest and highest Marine Levels 













Location. 



o c 



Obser 



-ed altit;- 



(l-s. 



Stream valley and station. 



o— ' 



Defi- 

 nite. 



Ap- 

 I)r()K. 



Mini 

 mnni. 



MASRACHU.^ETTS 











Dcerlield Rivor Sir Ihnni-^ Fnll - 



4'.0 



400 







Connectiont R'.ver Xoi-tlili- Id and i:-\st 





Nortliliold. 











(See Emerson's papers) 











Mill(M-s Rivoi- Farley 



risf) 





^80 



no') 



North Nashua River. . . . F:tcld)nrg 



:\m 





400 





