UNITED STATES GEOLOGICAL SURVEY 
COPPER-BEARING ROCKS OF LAKE SUPERIOR PL. | 
—— =a —~ - - 
| DEVONIAN KEWEERNAWAN Zo 
a Tacielibate Upper division 
(7) Hamilton group ED hier division —- 
ry 02" ae 
i 
SILURIAN. TURONIAN 
BHA tadevers exp Te igs \Canatian Haren [es 
reketl sf byBell Most 
|) GBH) onondaga Sart group Oiierareas in Gala aromas oronan Hol et 
iEca| Dut ithas nol been sanstictoridy shownthat manyor the scl 5 
I Niagara Group Here melured donot raQua belong with the older guesses 
AA 
] Ciiteinnati group, (Gg Agere or under tay slates of Ove marth shore Veemill 
Lake iron bearing series, and tron bearmd: 
eal ‘Trenton group ; 
] Gneess i idl crys tall schists Sor ft 
CAMBRIAN Doaeinn eel oun tate taedad belong eth Gan thea 
. Dal hare not been sufficiently separated ax yet for 
Lower Magnesia) Himestone i - : 
me Guciferous group mapping 
Pol iutone of the —t. Dip and strike of inclined strata 
é 4 Strata honxontal or nearly so. 
<a ——— Conjectiral position of thelne betreen Ue upper 
eee as Ud our divasian of the Kewoenine series 
The Western "Sandstone 
2.650700 OF T inch = QL S85 Mile 
BX stannarils Rock 
,TLK ISLAND 
apode Lightigs —* 
7) ae {owtec ia 
Polat Abbr Yyrem Leland Le If 
i} ) Sto id f ies : j 
tae a Stockton Jd 2 are 
cana Ut po! 
| Kant 
Whi) 
North Fax 1d 
