POSTGLACIAL BOITA OF THE GREAT LAKES REGION 181 



D. LAKE CHAMPLAIN VALLEY 



Near Clarenceville, about four miles north of the Vermont boundary line, 

 beds of fresh water shells occur about ten feet above Lake Champlain. The 

 specimens are mixed in sandy clay as follows: 206 



Lampsilis ventricosa Macoma groeidandica 



Eurynia recta Mya arenaria 



Lymnaea species 



As Lake Champlain was first a glacial lake and later a marine estuary, it is 

 possible that the fresh water shells occupied the former and the marine shells 

 the latter body of water. Additional stratigraphical data and material are 

 needed to satisfactorily determine this point. 



The marine deposits of the Champlain Valley have not been studied as 

 thoroughly as have those of the St. Lawrence Valley. Evidences of the 

 presence of the sea have been observed in the northern part of Vermont and 

 New York, bordering Lake Champlain. Fossil shells, as well as other marine 

 life (including the bones of a whale), have been noted at the following locali- 

 ties: 1 



.207 



Vermont 



East Panton (Elgin Spring) West Milton 



Vergennes Checkerberry Village 



Shelburne (Morses and Shelburne Falls) Swanton 



Charlotte (Mutton Hill) Burlington 



Colchester (Mallett's Bay) Panton 



New York 

 Port Kent, Clinton County Norwood 



Plattsburgh, Clinton County Willsboro 



Ogdensburg Crown Point peninsula 



Freydenburg's Mills on the Saranac 

 V/i miles below Mooer's Forks, at the bend of the Big Chazy. 



E. MARINE DEPOSITS OF THE ST. LAWRENCE VALLEY 



Thruout the St. Lawrence Valley, east of Ottawa and Montreal, many de- 

 posits occur which contain the remains of an abundant and varied fauna. 

 None of these, as far as at present known, contain fresh water mollusks. The 

 most important localities at which marine fossils have been found are, 



Beauport, near Quebec. 208 



20 » Dawson, Can. Nat., V, p. 195. 



2,7 Baldwin, Amer. Geol. XIII, pp. 170-184; Woodworth, Bull. N. Y. State Museum, 

 No. 83, p. 49; No. 84, pp. 208-215. 



208 Dawson, Can. Nat., II, p. 40S; Billings, Can. Nat., I, p. 338. 



