UNITED STATES. GEOLOGICAL SURVEY 
West Bluff 
<— N ZL 
LAKE SUPERIOR 
SSAA 
SO al 
Sy BES 
LLG Sa 
Outer: Conglomerate” “Lake Shore The Great Conglomerate '  Marvines ' “Ashbed Group” 
Trap” ‘Group C” 
k— N. 
LAKE wy 
Ae Wy < 
eZ sy “ 
" Outer “Lake Shore Trap” The Great Cong lomerate Marvines Greens 
Conglomerate” “Group C~ Grou 
Eagle River sandstones 
LZ 
17 
AEE 
: SO 
3 CES 
Z Dae ees 
Sea 
Seng Oo 
RASA OOD 
Marvines Marvines “Ashbed 
Z ry aan = TE 
SAA EES 
* Outer Conglomerate" “Lake Shore 
Trap” “Group C “Group B’ Group” 
Red Sandstone and Shale ‘Wonesuch' Red Sandstone ' 
Slate belt 
een PORTAGE LAKE = 
= = AGE LAKE eI 
DEEDES SILESIA SAS SS SSIS SISSIES ESSE SSL SS 
IDES IE II ISD ESI 
| 
ce EADELGEIS A 
Read 
Sandstone and Shale 
GEO 
