Tertiary Fossils oj Canada^ ^'c» 195 



Fine gray sand (shells of Valvata, (fee.) 2 inclies 



Clay, 1 foot 



Gray sand, laminated {Tellina Greenlandica),.. 3 " 



Clay, 8 " 



Light gray sand (Valvata, Cyclas, Paludlna^ 



Planorhis and Tellina)^ 10 " 



Clay, 1 foot 2 " 



Brown sand and layers of clay, [Planorhis and 



Cyclas), 4 " 



The species were the same with those described in my previous 

 papers, and the only marine shell is Tellina Greenlandica^ a 

 species now found farther up in our estuaries than most others. 



Mr. Dickson informs me that a similar case occurs near Clar- 

 enceville, about four miles from the United States frontier, and 

 at an elevation of about ten feet above Lake Charaplain. Speci- 

 mens from this place contain large shells of Unio rectus and U. 

 venfricosus, the latter with the valves cohering, and a Lymnea. 

 Intimately mixed with these in sandy clay are valves of Tellina 

 Groenlandica and 3fya arenaria. 



I record these facts, without pledging myself to the conclusion 

 that these deposits really mark the margins or river estuaries of 

 the old Pleistocene sea of Canada ; though they will certainly bear 

 that interpretation. In farther connection with these facts, and 

 in relation also to the question why marine fossils have not been 

 found west of Kingston, Mr. Dickson informs me that fossil capelin 

 are found on the Chaudiere Lake, 183 feet above Lake St. Peters, 

 on the Madawaska 206 feet, and at Fort Colonge Lake 365 feet 

 above the same level, a very interesting indication of the gradual 

 recession of the capelin spawning grounds, from this last high 

 elevation to the level of the more celebrated locality of these fossils 

 at Green's Creek. Farther, throughout the Counties of Renfrew, 

 Lanark, Carlton and Leeds, the marine deposits rise to an ele- 

 vation of 425 feet, or nearly the same with that which they reach 

 on Montreal Mountain ; but while this elevation would with the 

 present levels of the country carry a deep sea to the head of Lake 

 Ontario, no marine fossils appear to have been found on the banks 

 of that lake. Was the depression of the later pleistocene period 

 limited to the country east of Lake Ontario, or have the marine 

 deposits of the upper St. Lawrence hitherto escap??d observation 



