56 THK UK AdH IN' CANADA. 



l(j him lli(.' hoiildiT-diii'L is llicrc llic iipix'r iiieinber of 

 the scries. More recently Prof. Xcwherrv has given a 

 suiiiinary of the facts in his llepoi'L of tlic ( Jciolo^'ical 

 Survey of ()hio for ISOi). From these sources I condense 

 tlie followinii' statements : 



The lowest, memher of the we.gtern drift, eurrcspoiiding 

 to the Krie elavs of the Canadian I{ei)ort, is verv widelv 

 distriltuteij, and tills up the old hollows of the country, in 

 some easc.s hcinn' two hundiiMl feci or more in thickness. 

 Toward the noi'th these (days contain hoidders and stones, 

 liut do not constitute a tiue lioulder-clay. They rest, 

 however, on the glaciated rock siu'faces. They have 

 afforded no fossils e.\'c(>])t drifted \e,uetahle remains, which 

 appear to occur in an " intcrglacial "' or forest bed between 

 lower and ui)])cr boulder-deposits. 



Abovi! these (days are sands of \arial)le thickness. 

 Tliey contain beds of gravel, and near tla; surface teeth 

 of elephants ha\'e been fouml. (hi the surface are scat- 

 tered boulders and Idocks of northern origin, often of 

 great size, and in some cases trans[)orte(l two hundred 

 miles from their original })laces. More recent than all 

 these deposits are the " Lake Ilidges," marking a former 

 extension of the great lakes. 



I believe the Leda (days throughout Canada to consti- 

 tute in the main one contemporaneous fornuition. Of 

 cour.se, however, it must be admitted that tlu^ deposit at 

 the higher levels mav have ceased and been laid dry 

 while it was still going on at lower levels nearer the sea, 

 just as a similar deposit still continues in the gulf of 8t. 

 Lawrence. On the whole, then, while we regard this as 

 one bed, stratigraphically, we may be prepared to find 

 that in the lower levels the upper layers of it may be 

 somewhat more modern than tho.se portions of the 



