rHK SUCCKSSIOX OK DKl'OSITS. 47 



^■reiit (|imiil.iti('s of lnnildci's were Iirou^lit dowii into it, 

 ('Specially from the Liinrenlidc hills, iiiid were drifted 

 aloiiy the \idley, [)riiieil)idly l<i the soulh-west. Ivxteiisivi' 

 erdsioii also took ]»laee Uy the eoiiiliiiied action of frost, 

 rain, niellin,i;' siiows, and the arctie cnrreiit and the waves, 

 and tinis was fnrnislu'd the liner material of the houhU'r- 

 <day. ()ii the sonth shore of the St. Lawrence, the Xotre 

 l)aine mountains, stretchinj;' ont towards cajjc (laspe, 

 uriord indications of local ^'lacialiiMi, and Mr. \l. Chalmers 

 lias shown that the niovemcnl of ice from this ek'valed 

 re^'ion has been hoth .south toward the haie dcs Ciialeurs, 

 and north toward the St. Lawrence.* I liave myself 

 seen {im])le evidence in larj^'c Iruvelled honlders of Silnrian 

 limestone on the south shore of the St. Lawrence, of drift 

 from the hills on the south intermi.xed with that from the 

 Laurentians on the north. Sinnlai' facts have heeii 

 observed Ijy Ells and Low in the hills of the Eastern 

 Townships of the province of (,^)uel)ec. 



It is further to he observed that o.scillations of land 

 must be taken into acc(juut in e.\plaiuin<i; tlie.se phenomena. 

 Elevations increasing the hei,uht and area of land might 

 increase the space occu])ied by snow and land ice. 

 Depressions, on the other hand, would bring larger areas 

 under the intluence of water-borne ice and marine 

 <leposits, and these might take ])lace either in a shallow 

 sea loaded with field and coast ice, or in deeper water in 

 which laig'e icebergs might Hoat or ground. The efleets 

 would be the greater if, as Dr. (}. ^L Daw.son has shown 

 in the ca.se of the Cordilleran chain, there was une(iual 

 elevation causing contemi)oraneous dejaession of the 



* On the (ilaciation and Pleistocene subsidence of northern New 

 Brunswick and south-eastern Quebec. Trans. R.S.C., 1880. 



