LAKE    SUPERIOR   REGION. 
32 
of  the  Lake  Superior  region. 
Crystal    Falls    dis- 
trict. 
Menominee  district. 
Keweenaw  Point. 
Michipicoten. 
Other  parts  of  On- 
tario   north,  of 
Lake  Superior. 
Middle    and    up- 
per    Keweena- 
Interbedded 
w  a  n.       Inter- 
sediments     and 
bedded      lavas 
traps      along 
and    sediments 
Lake      Superior 
grading  up  in- 
shore. 
to  sandstones. 
II  an  bury    slate, 
bearing  in  lower 
portions     calca- 
Michigamme 
reous  slates, etc., 
slate,  containing  a 
containing    sid- 
productive     iron- 
bearing    hori- 
erite    and    iron 
Animikie    group 
oxide. 
of  northwest 
zon      not      sepa- 
Vulcan formation, 
shore,    compris- 
rated in  mapping 
consisting  of 
ing  iron  forma- 
for  much  of  the 
three  members: 
tion  overlain  by 
district.      With 
Curry  iron-bear- 
slate. 
basic  volcanics. 
i  n  g       member, 
Brier  slate  mem- 
ber,    Traders 
iron-bearing 
member . 
— (Unconformity?) — 
—(Unconformity  ?)— 
Lower-midd  le 
Huronian: 
Lower-middle 
Undivided    pre- 
Huronian: 
Animikie  sedi- 
Basic erupt ives. 
Acidic     erup- 
ments,  mainly 
graywackes, 
tives. 
slates,     and 
Hemlock  formation 
Randville     d  o  1  o- 
Dorp  conglom- 
conglomer- 
(basic volcanic). 
mite. 
erate. 
ates,     much 
Randville  dolomite. 
Sturgeon    quartz- 
metamor- 
Sturgeon  quartzite. 
ite. 
phosed. 
Granite. 
Granites  and 
( i  r  a  n  i  t  e  s  and 
Granites    and 
gneisses. 
gneisses. 
gneisses. 
Eleanor  slate. 
Helen    forma- 
Greenstone   and 
tion      (iron 
iron   formation, 
Quinnesec  schist. 
bearing    and 
productive) . 
Wawa  tuff. 
similar  to  that 
of  Vermilion  dis- 
trict   of   Minne- 
Gros Cap  green- 
sota. 
stone. 
