68 TIIK ICH A(iK IN CANADA. 



jectin,u; liills, iiiid followiiin' did lines of cdust. These nvo 

 C'-videiilly of the nature of niodeni ,i;Tiivel and sliinule 

 banks, and are distinuuished from moraines and iee-shove 

 deposits by their water-worn and sorted material. 



()u the lower St. Lawrence I have observed marine 

 shells on the terraees up to al)out GOO feet above the level 

 of the sea, but they will i)robid>ly be found by diliti'ent 

 search at higher levels. In the arctic re,t,don. Captain 

 Fielden (Journal of (ieol. Society of Lond(Jn,^^)l. XXXIV., 

 liS78, p. 5()()) rejxtrts I'leistocene sh(dls, vi/., /'ccft'ii 

 IshdidicKS, Asfid'fr Jkh'ckHx, Mija irnnrata and Sa.i'icarn 

 riif/oxa, at the height of 1,000 feet abo\e the sea. 



With the terraces and elevated banks nnist be as.sociated 

 the later boulder-drift, which has distril)uted travelled 

 stones and boulders throu<.^h ami over the Saxicava sand 

 and the moraines fif older local glaciers, and has (lej)osited 

 them at high levels on hills and n> intains far inland. 

 The assignment of siudi loose Ijouluers to their precise; 

 date is, however, often extremely ditlicult, a fact which 

 may be well seen from a study of the data accunnilated by 

 the l)oulder committee of the (Jeologieal Society of Scot- 

 land, under the })residency of my friend, Mr. David ]\Iilne 

 Home. Xeglecting altogether for the present Ixnilders 

 not far removed from their native sites, some of the far- 

 travelled boulders at high levels may have been left as 

 residue of the denudation of the more elevated sheets or 

 ])atches of boulder-clay. Others may belong to the 

 driftage of the margins and banks of the mid-glacial 

 depression of the Leda clay, l)ut these can scarcely have 

 reached higher levels than about GOO feet. Others still 

 may have been carried l)y ice in that short-lived depression 

 of very great magnitude which .seems to have innnediately 



