VAN.msE.l  LAKE  SUPERIOR  REGION.  199 
in  other  districts,  but  that  it  will  be  possible  to  subdivide  these  various 
series  into  fifteen  or  twenty  or  more  members,  as  was  done  by  the  early 
authors,  and  to  correlate  these  small  divisions  with  each  other  through- 
out the  lake  Superior  region,  there  is  not  the  least  probability. 
While  perhaps  more  has  been  done  in  pre-Cambrian  stratigraphy  in 
the  lake  Superior  region  than  in  any  other  region  in  America,  this  very 
fact  opens  before  us  numerous  and  difficult  problems. 
NOTES. 
1  Notes  on  the  Geography  and  Geology  of  Lake  Superior,  John  J.  Bigsby.  Quart. 
Jour.  Sci.,  Lit.  and  Arts,  vol.  xvm,  pp.  1-34,222-269;  with  map. 
3  Outlines  of  the  Geology  of  Lake  Superior,  H.  W.  Bayfield.  Trans.  Literary  and 
Historical  Soc.  of  Quebec,  vol.  i,  1829,  pp.  1-43. 
3  On  the  Junction  of  the  Transition  and  Primary  Rocks  of  Canada  and  Labrador, 
Capt.  Bayfield.     Quart.  Jour.  Geol.  Soc,  London,  vol.  i,  1845,  pp.  450-459. 
4  On  the  Geology  and -Economic  Minerals  of  Lake  Superior,  W.  E.  Logan.  Rept. 
of  Prog.  Geol.  Survey  of  Canada  for  1846-'47,  pp.  8-34. 
6  On  the  Geology  of  the  Kaministiquia  and  Michipicoten  Rivers,  Alexander  Mur- 
ray.   Ibid.,  pp.  47-57. 
6  On  the  Age  of  the  Copper-Bearing  Rocks  of  Lakes  Superior  and  Huron,  and 
various  facts  relating  to  the  Physical  Structure  of  Canada,  W.  E.  Logan.  Rept.  of 
British  Assn.  for  the  Adv.  Sci.,  1851,  21st  meeting,  pp.  59-62,  Trans. ;  see  also,  On 
the  Age  of  the  Copper-Bearing  Rocks  of  Lakes  Superior  and  Huron,  William  E. 
Logan.     Am.  Jour.  Sci.,  2d  ser.,  vol.  xiv,  1852,  pp.  224-229. 
I  On  the  Geology  of  the  Lake  of  the  Woods,  South  Hudson s  Bay,  Dr.  J.  J.  Bigsby. 
Quart.  Jour.  Geol.  Soc,  London,  vol.  vin,  1852,  pp.  400-406.  With  a  geological  map 
of  the  Lake  of  the  Woodd. 
8  On  the  Physical  Geography,  Geology,  and  Commercial  Resources  of  Lake  Su- 
perior, John  J.  Bigsby.     Edinburgh  New  Phil.  Jour.,  vol.  liii,  1852,  pp.  55-62. 
9 On  the  Geology  of  Rainy  Lake,  South  Hudsons  Bay,  Dr.  J.  J.  Bigsby.  Quart. 
Jour.  Geol.  Soc,  London,  vol.  x,  1854,  pp.  215-222.  With  a  geological  map  of  Rainy 
Lake. 
10  On  the  Geological  Structure  and  Mineral  Deposits  of  the  Promontory  of  Ma- 
mainse,  Lake  Superior,  John  W.  Dawson.  Can.  Nat.  and  Geol., vol.  n,  1857,  pp.  1-12. 
With  a  section. 
II  Report  of  Progress  of  the  Geological  Survey  of  Canada  from  its  Commencement 
to  1863,  W.  E.  Logan;  pp.  983.     With  an  atlas. 
12  On  the  mrentian,  Huronian,  and  Upper  Copper-Bearing  Rocks  of  Lake  Su- 
perior, Thongs  Macfarlane.  Rept.  of  Prog.  Geol.  Survey  of  Canada  for  the  year 
1863  to  1866L>p.  115-164. 
1:5  On  thefw  Jeological  Formations  of  Lake  Superior,  Thomas  Macfarlane.  Can. 
Nat.,  2nd  (  ,r.,  vol.  in,  1866-'68,  pp.  177-202,  241-257. 
14  On  the  Geology  and  Silver  Ore  of  Woods  Location,  Thunder  Cape,  Lake  Superior, 
Thomas  Macfarlane.     Can.  Nat.,  2d  series,  vol.  iv,  pp.  37-48,  459-463;  with  a  map, 
15  On  the  Geology  of  the  Northwest  Coast  of  Lake  Superior  and  the  Nipigon  Dis- 
trict, Robert  Bell.  Rept.  of  Prog.  Geol.  Survey  of  Canada  from  1866  to  1869,  pp.  313- 
364;  with  a  topographical  sketch-map. 
16  Report  on  the  Country  North  of  Lake  Superior,  between  the  Nipigon  and  Michi- 
picoten Rivers,  Robert  Bell.  Rept.  of  Prog.  Geol.  Survey  of  Canada  for  1870-71,  pp. 
322-351. 
17  Report  on  the  Country  between  Lake  Superior  and  the  Albany  River,  Robert 
Bell.     Rept.  of  Prog.  Geol.  Survey  of  Canada  for  1871-72,  pp.  101-114. 
18  Notes  of  a  Geological  Reconnaissance  from  Lake  Superior  to  Fort  Garry,  A.  R.  C. 
Selwyn.     Rept.  of  Prog.  Geol.  Survey  of  Canada  for  1872-73,  pp.  8-18. 
