206 TIIK ICE ACiK IX CANADA. 



iViralk'l and in l)i,s paper on the Sui)erHcial Deposits of 

 the I'hiins. To tliese reference may he made for details. 



The sections j^dven in the iif^ures re})resent some features 

 of these deposits, and are interestin<:f as showing its 

 massive character in some places, and the fact of an 

 underlyin<^' dei)Osit of water-sorted material. The general 

 structure, however, a]i])ears to he that stated in Cliap. II., 

 namely, an under and ujtper Ijoulder-deposit, separated 

 hy heds of stratified silt, and sometimes liolding vegetahle 

 matter. 



I do not propose to extend these local details into the 

 vast regions lying in the Arctic l)asin, north of the 

 Laurentian water-shed and west of the l)asin of the great 

 lakes in ]\Ianitoha and the Xorth-west and in l>ritish 

 Columhia. These regicjns have Ijcen descril)ed, the lattei', 

 from i)ersonal knowledge, and hoth, with reference to all 

 the available authorities, l)y my son. Dr. (}. M. Dawson, 

 F.li.S., aiul I may refer to his two memoirs : " Xotes on 

 the CJeology of the Northern Part of the Donunion of 

 Canada," IJeports Geological Survey of Canada, 1887 ; 

 and " On the Later Physiographical (iJeology of the IJocky 

 Mountain IJegion in Canada," Transactions of IJoyal 

 Society of Canada, 1890. In these papers will also be 

 found co])ious references to all previous explorations and 

 sources of information. 



