eae et i “a 
S OF LAKE SUPERIOR PL. XXxvIll 
Lie — 
to approad, and sometimes two or more 
sepresent the lower drvistan the orange lines the uppar VUsLON 
| tie blue tines represent the unde 
|| lines are based on observation. where broken 
The formations newer han te Kaweenawan are 
passes under therm 
For more complete explanation see chapuer Xx 
Es Lower and Upper Silurian and Devoraan Limestone 
[EY viene Cotored Cambrian (Potsdam) Sandstone 
(GHEY Reatisn SPE ria dstarie (Acronndcontinnation of 2) 
Scale avntnon orlinch= 31.565 miles. 
{ Caribou Ti 
a sar oo ee 
t/ ISLAND yg 
Light L 
‘Outer Id 
Co “= a“ 
" op voce fa. 7 
Sf Michiean 1a 
; hight, House 
{Madedrane 7” 
ir Channel 
<4 Pouite 1 House 
See} | WHLTR. vrs y. 
v - 
WAY, Hi corcapeg 
Troquas. > 
A Hoon Co, Lith Baltimare 
RUCTURE AND EXTENT OF THE KEWEENAWAN TROUGH. 
