Till': srccKssioN or dki'osits. 89 



• 'laciiilnl Imiips uf I'liiii sliali- ;iii«l nilifi' sul't incUs, wliirh 



hocttiiic tlisiiitfiiraird ai umcc wlicii cNiM.scd to wcallicnii^'. 



The till.' l.i.iild.'i-clav is ill all (.r.liiiary cas.'s the (.Mcst 



UH'IIiImT ..I' the I'jcisluccli.' .l.'l-osils. ail.l it is lint l.ussil.lr 



to (lividr it iiitn disliiirt iMuildfr-clavs (.f dilU'iviii 

 a<,'('s, siiiM'iiiiiiMis.'d nil niif aiintlicr. It may 1m' nliscivt'd, 

 linwcMT, that ill sn till' as tilt' linuldcr-clay is a iiiai'iin' 

 doposil, tliiil wliicli nccurs at InwiT ifxt'ls is in all pm- 

 hal.ility lU'Wcr iliaii ilial wliirli .icciiis at lii-la-r IfV.'ls. 

 It is alsn In lie nlisclNcd that l-nuldds Willi layt'i's n|' 

 sioiu's (K'C'asi(»iially ncciir ill tlic l.cda clay : and llial tlm 

 suiM-rlicial samls and .i-ravrls sninctiiiirs cniitain iari^n^ 

 Wniildcrs, and cv.'ii cniistitntc an iii.ikt nr ncwrr hnnld.T 

 I'nnuatinii; hut Llu-sc appearances arc n<.t usually snlli- 

 cicntly iniiinrtant In ciiusc any cxpcriciu'cd nhscrvcr tn 

 Miislakc such nvcilyin;4 deposits t'nr the Inwer hniilder-clay. 

 They hclnii-' tn the second nr newer pail i)i the pelind. 



Ill some Inealities the stniies ill the hniildcr-clay aro 

 almost oxchisivi^ly those of the iiei;/lihomiii.y' rock t'onna- 

 Lious, and this is espiicially the case at the hase ol" dills or 

 proiiiinent outcrops, whence a lar^c ((uaiitity of material 

 would he easily (U'rived. In other eases, tliou»,di k'ss 

 t'rciiueiitly, material travelled fi.an a distance lartrely 

 predominates. Throu;,diout the valley of the Lower St. 

 Lawrence, the .uiieiss and other hard metamorphie rocks 

 of the Laureiitian hills to the north-east are very 

 ahuiidant.and iu Ixmlders of larue si/e and much roundetl. 

 Occasional instances also occur where large houlders iiave 

 heeu transported to the northwards ; hut these are com- 

 paratively rare, excei>t in the second or upper drift. I 

 have mentioned some examjjles of this in "Acadian 

 Geology," p. 01. Similar instances are mentioned in the 

 " Geology of Canada," p. H9:>. 



