204  PRE-CAMBRIAN   ROCKS    OF    NORTH   AMERICA.  [bull.  86. 
106 On  the  Youngest  Huronian  Rocks  South  of  Lake  Superior,  and  the  Age  of  the 
Copper-hearing  Series,  T.  B.  Brooks.  Am.  Jour.  Sci.,  3d  ser.,  vol.  xi,  1876,  pp. 
206-211. 
107  Classified  list  of  Rocks  observed  in  the  Huronian  Series  south  of  Lake  Superior. 
T.  B.  Brooks.     Ibid.,  vol.  xn,  pp.  194-204. 
108  Metasomatic  Development  of  the  Copper  Bearing  Rocks  of  Lake  Superior, 
Raphael  Pumpelly.   Proc.  Am.  Acad.  Arts  and  Sci.,  1878,  vol  xm,  pp.  253-309. 
109  First  Annual  Report  of  the  Commissioner  of  Mineral  Statistics  of  the  State  of 
Michigan  for  1877-78,  Charles  E.  Wright.     Marquette,  1879,  229  pp. 
110  Upper  Peninsula,  C.  Rominger.  Geological  Survey  of  Michigan,  vol.  iv,  pp. 
1-248,  with  a  geological  map. 
111  Report  of  N.  H.  Winchell.  16th  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  of 
Minnesota  for  1887,  pp.  13-129. 
>12  Report  of  Alexander  Winchell.     Ibid.,  pp.  133-391. 
113  A  Sketch  of  the  Geology  of  the  Marquette  and  Keweenawan  District,  M.  E. 
Wadsworth.  Along  the  South  Shore  of  Lake  Superior,  by  Julian  Ralph.  1st  edi- 
tion, 1890,  pp.  63-82. 
"4 Ibid.,  2d  edition,  1891,  pp.  75-99. 
115  On  the  Relations  of  the  Eastern  Sandstone  of  Keweenaw  Point  to  the  Lower 
Silurian  Limestone,  M.  E.  Wadsworth.  Am.  Jour.  Sci.,  3d  ser.,  vol.  xlii,  1891,  pp. 
170-171  (communicated). 
116  The  South  Trap  Range  of  the  Keweenawan  Series,  M.  E.  Wadsworth.  Ibid.,  pp. 
417-419. 
117  Geological  Report  on  the  Upper  Peninsula  of  Michigan,  exhibiting  the  progress 
of  work  from  1881  to  1884,  C.  Rominger. 
This  report  was  finished  and  transmitted  to 'the  governing  board  of  the  Michigan 
Geological  Survey  several  years  ago,  but  as  yet  remains  unpublished.  A  manuscript 
copy  was  kindly  furnished  us  for  our  use,  and  from  this  the  abstract  is  taken. 
118  On  Southern  Wisconsin,  including  the  iron,  lead,  and  zinc  districts,  with  an  ac- 
count of  the  Metamorphic  and  Primitive  Rocks,  James  G.  Percival.  Ann.  Rept.  Geol. 
Survey  of  Wisconsin,  1856,  pp.  111. 
U9The  Iron  Ores  of  Wisconsin,  Edward  Daniels.  Ann.  Re*pt.  Geol.  Survey  of  Wis- 
consin for  the  year  ending  1857,  pp.  62. 
110The  Penokee  Iron  Range,  Increase  A.  Lapham.  Trans.  Wis.  State  Agr.  Soc. ,  vol. 
V,  1858-'59,  pp.  391-400,  with  map. 
131  Geological  Report  of  the  State  of  Wisconsin,  James  Hall.  Report  of  the  Superin- 
tendent of  the  Geological  Survey  (1861),  exhibiting  the  progress  of  the  work,  pp.  52- 
»*  Physical  Geography  and  General  Geology,  James  Hall.  Report  on  the  Geologi- 
cal Survey  of  the  State  of  Wisconsin,  vol.  I,  pp.  1-72. 
123The  Penokie  Mineral  Range,  Wisconsin,  Charles  Whittlesey.  Proc.  Bost.  Soc. 
Nat.  Hist.,  vol.  ix,  1863,  pp.  235-244. 
134 On  the  Age  of  the  Quartzites,  Schists,  and  Conglomerates  of  Sauk  County,  Wis-* 
consin,  R.  D.  Irving.    Am.  Jour.  Sci.,  3d  ser.,  vol.  in,  1872,  pp.  93-99. 
126 Report  on  the  Geological  Survey  of  the  Mineral  Regions,  John  Murrish.  Trans. 
Wis.  Agr.  Soc,  1872-73,  pp.  469-494. 
126  On  the  relations  of  the  Sandstone,  Conglomerates,  and  Limestone  of  Sauk  County, 
Wisconsin,  to  each  other  and  to  the  Azoic,  James  H.  Eaton.  Am.  Jour.  Sci.,  3d  ser., 
vol.  v,  pp.  444-447. 
127Note  on  the  Age  of  the  Metamorphic  Rocks  of  Portland,  Dodge  County,  Wiscon- 
sin, R.  D.  Irving.    Ibid.,  pp.  282-286. 
126  On  some  Points  in  the  Geology  of  Northern  Wisconsin,  R.  D.  Irving.  Trans.  Wis. 
Acad,  of  Sci.,  vol.  n,  1873-74,  pp.  107-119.  See  also  on  the  Age  of  the  Copper-bearing 
Rocks  of  Lake  Superior,  and  on  the  Westward  Continuation  of  the  Lake  Superior 
Synclinal.  Am.  Jour.  Sci.,  3d  ser.,  vol.  vm,  1874,  pp.  46-56.  Ann.  Rept.  of  Progress 
and  Results  of  the  Wisconsin  Geological  Survey  for  1876,  pp.  17-25 ;  Report  of  Prog- 
ress and  Results  for  the  year  1874;  Geol.  of  Wisconsin,  vol.  n,  pp.  46-49. 
