22 / 3 | eee 
fF exrtends a the Tiver 
T 42 N 
T, 41 N, 
: 9 Horizontal (Potsdam stipdstone 
| 3 | 
I z ae 
| i ee Date bc 
Mission Sta 
40 IN, 
1.39 N. 
thw 
il 
Horivantal Misdam watdsto 
A Boon $ SS. Li. Baknmcere ' 
MAP SHOWING POSITION OF THE EXPOSURES OF KEWEENAWAN ROCKS AND POTSDAM SANDSTONE 
; ALONG THE LOWER PORTIONS OF SNAKE AND KETTLE RIVERS, MINNESOTA . 
