B. N. A. BOUNDARY COMMISSION. 
| 
Face p. 220. 
ad Bove Fy 
Pay SMa 
Wate Ligue vas b 
——_ 
\ ee 
Kay == — 
ji (\ * 

Figure 1—East! Fork of Milk River. (§552) a, boulder clay 
b. older river alluvium. c, newer river alluvium. d, surface 
stratum disturbed by frost, &c. 







Y 





ie 
(Pais 
Ck 


op UB, Tipe 


Ge 
is sb 
I 

a OD, Asn ose ES 
CSTE Lp ts 
he a 




‘tie 


fan 
Ky 
ail 

Figure 2—Long River (§ 502.) a, lower drift, 
chiefly local. 6, upper drift, with large travelled rocks. 
SECTIONS OF DRIFT DEPOSITS. 
PLATE XII. 



