EOLOGICAL SURVEY 
Mineral River 
North and South 
Lake Superior 
North and South 
POR CU BEN & 
Carp Lake 
a 
a 
= —zy = —_— 
| pa i ie 46 ity ot f" thw = 
IOP ON por eee st hh fF 
-” i pyr a ef 
= af AY A ES 
pegs" 
I 
Minerval River 
Tron River 
B. branch t 
Little Iron River Tron River 
TL 
Little Tron River 
MOUNTAINS 
f LINE 
sf 
23-51-43 26-51-43 
South 334° East 
Diabase and diabase 
amygdaloid im ing 
narrow conglomerate belts 
Quartz porphyry 
and felsite 
WE ee POSITS 
9-50-43 10-50-43 
h 
“AULT ® |= > 
Sandstone and 
amygdaloid with a conglomerate. amygdaloid . 
porphyry conglomerate 
Diabase moe es 
COPPER-BEARING ROCKS OF LAKE SUPERIOR PL. xx 
Iron River 
Iron River 
| 
Diabase and diabase 
Sandstone and 
conglomerate 
OLED 
SECTIONS ARE LOCATED BY NUMBER ON MAP OF PORCUPINE MOUNTAINS 
North and South 
‘Dark grey sandstone 
Red sandstone | 
and black slate , 
7 
GEOLOGICAL SECTIONS ILLUSTRATING 
PORCUPINE MOUNTAINS. 
Scale Too OHO or 1 inch = 333 f 
ATigoCk Co Lie Balemore. 
DEES Sabo a Wee O Mu 
