vanhisk.]  LAKE    SUPERIOR    REGION.  207 
179  Report  of  Eield  Observations  made  during  the  season  of  1888  in  the  Iron  Regions 
of  Minnesota,  H.  V.  Winchell.  SeA^enteenth  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey 
0f  Minn,  for  1888,  pp.  77-145;  see  also  The  Diabasic  Schists  Containing  the  Jaspilyte 
Beds  of  Northeastern  Minnesota.     Am.  Geol.,  vol   HI,  pp.  18-22. 
180  Report  of  Geological  Observations  made  in  Northeastern  Minnesota  during  the 
summer  of  1888,  Uly  S.  Grant.  Seventeenth  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey 
of  Minn,  for  1888,  pp.  149-215. 
181  Conglomerates  Enclosed  in  Gneissic  Terranes,  Alexander  Winchell.  Am.  Geol., 
vol.  in,  pp.  153-165,  256-262. 
182  Some  Thoughts  on  Eruptive  Rocks  with  Special  Reference  to  those  of  Minnesota, 
N.  H.  Winchell.     Proc.  Am.  Assoc.  Adv.  Sci.,  1888,  37th  Meeting,  pp.  212-221. 
183  The  Stillwater,  Minn.,  Deep  Well,  A.  D.  Meads.    Am.  Geol.,  vol.  in,  p.  342. 
184  On  a  Possible  Chemical  Origin  of  the  Iron  Ores  of  the  Keewatin  in  Minnesota, 
N.  H.  and  H.  V.  Winchell.  Ibid.,  vol.  iv,  pp.  291-300,  382-386.  Also  Proc.  Am. 
Assoc.  Adv.  Sci.,  1890,  38th  Meeting,  pp.  235-242. 
l8>Some  Results  of  Archean  Studies,  Alexander  Winchell.  Bull.  Geol.  Soc.  of 
America,  vol.  i,  pp.  357-394. 
186  The  Taconic  Iron  Ores  of  Minnesota  and  of  Western  New  England,  N.  H.  and 
H.  V.  Winchell.     Am.  Geol.,  vol.  vi,  pp.  263-274. 
187  Record  of  Field  Observations  in  1888  and  1889,  N.  H.  Winchell.  18th  Ann.  Rept. 
Geol.  and  Nat.  Hist.  Survey  of  Minn,  for  1889,  pp.  7-47. 
188 The  Iron  Ores  of  Minnesota,  N.  H.  and  H.  V.  Winchell.  Bull.  No.  6.  Geol.  and 
Nat.  Hist.  Survey  of  Minn.,  pp.  430;  with  a  geological  map. 
189  Geological  Age  of  the  Saganaga  Syenite,  Horace  V.  Winchell.  Am.  Jour.  Sci., 
3d  ser.,  vol.  xli,  1891,  pp.  386-390. 
190  Sketch  of  the  Geology  of  Northeastern  Dakota,  with  a  notice  of  a  short  visit  to 
the  celebrated  Pipestone  Quarry,  F.  V.  Hayden.  Am.  Jour.  Sci.,  2d  series,  vol.  xliii, 
pp.  15-22. 
191  The  Copper-Bearing  Rocks  of  Lake  Superior,  R.  D.  Irving.  U.  S.  Geol.  Survey 
Monograph  v,  pp.  464, 15  1.,  29  pi.  and  maps.  See  also  the  Copper-Bearing  Rocks  of 
Lake  Superior,  R. ,  *\  Irving.  Third  Ann.  Rept.  U.  S.  Geol.  Survey  1881-'82,  pp. 
89-188;  15  pi.  and  j  iaps.  The  Copper-Bearing  Rocks  of  Lake  Superior,  R.  D.  Irv- 
ing. Science,  vol./  ,  pp.  140,  359  and  422.  The  Copper-Bearing  Rocks  of  the  Lake 
Superior  Region. B Am.  Jour.  Sci.,  3d  ser.,  vol.  xxvin,  p.  462,  vol.  xxix,  pp.  67-68, 
258-259,  339-340/ 
192 The  Copper-Bearing  series  of  Lake  Superior,  T.  C.  Chamberlin.  Science,  vol. 
I,  pp.  453-455. 
193  On  Secondary  Enlargements  of  Mineral  Fragments  in  Certain  Rocks,  R.  D.  Irv- 
ing and  C.  R.  Van  Hise.     Bull.  U.  S.  Geol.  Survey,  No.  8,  56  pp.,  6  pi. 
194  Observations  on  the  Junction  between  the  Eastern  Sandstone  and  the  Keweenaw 
Series  on  Keweenaw  Point,  Lake  Superior,  R.  D.  Irving  and  T.  C.  Chamberlin 
Bull.  U.  S.  Geol.  Survey,  No.  23,  124  pp.,  17  pi. 
195  Divisibility  of  the  Archaean  in  the  Northwest,  R.  D.  Irving.  Am.  Jour.  Sci.,  3d 
series,  1885,  vol.  xxix,  pp.  237-249. 
i9b Preliminary  Paper  on  an  Investigation  of  the  Archaean  Formations  of  the  North- 
western States,  R.  D.  Irving.  Fifth  Ann.  Rept.  U.  S.  Geol.  Survey,  1883-84,  pp. 
175-242,  10  pis. 
197  Origin  of  the  Ferruginous  Schists  and  Iron  Ores  of  the  Lake  Superior  Region. 
R.  D.  Irving.     Am.  Jour.  Sci.,  3d  ser.,  vol.  xxxn,  pp.  255-272. 
198  Report  of  a  Trip  on  the  Upper  Mississippi  and  to  Vermilion  Lake,  Bailey  Willis. 
10th  Census  Report,  vol.  xv,  pp.  457-467. 
199 Is  there  a  Huronian  Group?  R.  D.  Irving.  Am.  Jour.  Sci.,  3d  ser.,  vol.  xxxiv, 
1887,  pp.  204-216,  249-263,  365-374. 
v00On  the  Classification  of  the  Early  Cambrian  and  Pre-Cambrian  Formations,  R. 
D.  Irving.  Seventh  Ann.  Rept.  U.  S.  Geol.  Survey,  1885-'86,  pp.  365-454,  with  22  pis. 
and  maps. 
