[a] 
Esta 
EEE 
sine aia 
GEOLOGICAL MAP. or tHE 
KEWEENAW SERIES” 
The Wester Sandstone 
$e  2andstor 
LOWER DIVISION 
Temperance River Group 
Beaver Bay Group 
Agate Bay Group 
| Lester River Group 
Duluth Group 
St Louis River Gabbro 
and Granilie porphyry 
——_———__,_ 
HURONIAN 
Animilkie Slates {Logans Lower 
Group of the Copper Bearing Series) 
ee 
Folded Crystalline Schists.Gneiss 
and Granite 
N 
Seale 400.000. or | inch-6 315 miles 
, led tor the country mnunediately 
Topography: compiled D 
the coast. fiom Land Otice Township 
Plats” ver iy the interior. 
Plats and U.S, Lake Survey Charts;fir ri0r. 
ts of the Geological Survey of Canada Rices 
Seanad Map of Minnesota and manuscript maps 
by Prot’ AH Chester and WM. Chauvenet 
Geology sketched in tron original observations lor 
the country immediately bordering He coast, fram 
observations by W. M. Chauvenet for the country about 
BruleLake and on the upper Cloquet, trom observa 
tions by Prot’ AM. Chester for the country bordering 
the upper $8! Louts and Embarras rivers,and from 
reports of the Canadian Geological Survey (RBell) 
tor the courdry along Pigeon river and thenee northward. 
The geological boundaries, except in the tmmediate + 
vicinity of the coast, are /or the most part only appren 1 
mute being located by pouts distantly removed trom 
each other. 
5) RIOR 
LAKE SUPERUO 
= 
NoRTH WYROMST or LAKE SUPERIOR. 
~~ =" 
= " — mesh L 
ya) 
—— 
es 
Mt 
Pigeon Kis 
a : 
COPPER “BEARING ROCKS OF LAKE 
1. SUPERIOR 
ie 
—_ 
=] 
> 
