XII, 
PLATE 
B. N. A. BOUNDARY COMMISSION. 
} 
Preponderating quartzite drift. 
Preponderating north-eastern drift. 

Figure 1-—Diagramatic section on lat 46°. ($ 528.) a, Trilutaries of the Missouri.” >, The Souris River. The arrows indicate the 
position of the watershed. 
) Preponderating quartzite drift, 
Preponderating nurth-castern drift. 

Figure 2—Diagramatic section north-east of Wood Mountain. (3531) Lettering as above. The asterisk indicates the position of 
saline lakes in the lower part of ancient vallies, 
| SECTIONS OF THE COTEAU AND EDGE OF THR THIRD PRATRIE STEPPE. 
i a Cn a a a 


Face p. 230. 
