The American Geologist, Vol. XXXV. 
HS7 
Plate Xir 
1.5 fc 
[Map of the Pembina region, North Dakota. The stippled area is delta 
deposit. To the west of this deposit the underlying formations are 
Cretaceous shales; to the east are the typical silts of the Red 
River Valley. See cross sections, Figs. 1 and 2.] 
