it, 
ithe Western fo rikontel Sandstone 
‘The Eastern Horizontal Sandstone 
KEWEENAW = SERIES 
The Main Body of Sandstone 
The Black Shales 
| 
E The Outer Conglomerate 
Sendstone and Conglomerate 
Diabase, Diabase daloid, Melaphyr, 
with a few coarse imbedded thin Conglom- 
erates 
Ge GE EB 
Coarse grained Gobbro 6 | 
} Felwite and Quarts porphyry 
LOWER > DIVISION 
Granitic porphyry 
Granite penetrating the Coarse 
| Gabbro and Huronian Schists 
HURONIAN 
Mica- schists, Slates, Magnetic rocks ete 
HBB 
LAURENTIAN 
Os Sneins, Mica gneiss ae 
Gi € 
mite ete 
Scale snoiomo or Linch « 4735 miles 
UNITEO STATES BEOLUGICAL SURVEY 
mae Dh es 
soeaiae 
al 
5 guaeeaaue 
atts 
Yin 
yy 
Yj 
ee 
areeeuaras 
Vs 
o 
ae 
SY 
Bea. 
L i 
. Gg Aha os 
_~ mee 
COPPER~BEARING ROCKS OF LAKE SUPERIOR PL.xxit 
i; ) “A UT ie i ~ m = 2 ‘ ; IVER ‘ . S Fae " 
GEOBOGICAL MAP OF THE REGION BETWEEN THE ONTONAGON RINE MICHIGAN anp NUMAKAGON LAKE WISCONSIN 
