206  PRE-CAMBRIAN  .ROCKS    OF    NORTH    AMERICA.  [bull.  89. 
lft6  Ueber  die  Krystallinischen  Gesteine  von  Minnesota  in  Nord-Amerika,  A.  Streng 
and  J.  H.  Kloos.  Leonhard's  Jahrbuch,  1877,  pp.  31, 113,  225.  Translated  by  N.  H. 
Winchell  in  11th  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  of  Minn.,  pp.  30-85. 
166  Sixth  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  of  Minn,  for  1877,  N.  H.  Winchell, 
pp.  226. 
157  Sketch  of  the  Work  of  the  Season  of  1878,  N.  H.  Winchell.  Seventh  Ann.  Rept. 
Geol.  and  Nat.  Hist.  Survey  of  Minn,  for  1878,  pp.  9-25. 
168  The  Cupriferous  Series  at  Duluth,  N.  H.  Winchell.  Eighth  Ann.  Rept.  Geol. 
and  Nat.  Hist.  Survey  of  Minn,  for  1879,  pp.  22-26. 
169  Preliminary  Report  on  the  Geology  of  Central  and  Western  Minnesota,  Warren 
Upham.  Ibid.,  pp.  70-125. 
i6°  Report  of  Prof.  C.  W.  Hall.    Ibid.,  pp.  126-138. 
i6i  Preliminary  List?  of  Rocks,  N.  H.  Winchell.  Niuth  Ann.  Rept.  Geol.  and  Nat. 
Hist.  Survey  of  Minn,  for  1880,  pp.  10-114. 
16iThe  Cupriferous  Series  in  Minnesota,  N.  H.  Winchell.  Proc.  Am.  Assoc.  Adv. 
Sci.,  29th  Meeting,  pp.  422-425.  See  also,  Ninth.  Ann.  Rept.  Geol.  and  Nat.  Hist.  Sur- 
vey of  Minn,  for  1880,  pp,  385-387. 
163  Preliminary  List  of  Rocks,  N.  H.  Winchell.  Tenth  Ann.  Rept.  Geol.  and  Nat. 
Hist.  Survey  of  Minnesota  for  1881,  pp.  9-122. 
164  Notes  on  Rock-outcrops  in  Central  Minnesota,  Warren  Upham.  Eleventh  Ann. 
Rept.  Geol.  and  Nat.  Hist.    Survey  of  Minn,  for  1882,  pp.  86-136. 
105  The  Iron  Region  of  Northern  Minnesota,  Albert  H.  Chester.    Ibid.,  pp.  154-167. 
16,Note  on  the  Age  of  the  Rocks  of  the  Mesabi  and  Vermilion  Iron  District,  N.  H. 
Winchell.  Ibid.,  168-170.  See  also  Proc.  Am.  Assoc.  Adv.  Sci.  1884,  33rd  Meeting,  pp. 
363-379. 
167  The  Geology  of  Minnesota,  N.  H.  Winchell  and  Warren  Upham.  Vols.  I  and  n  of 
the  Final  Report,  pp.  697,  695. 
168  Notes  of  a  trip  across  the  Mesabi  Range  to  Vermilioa  Lake,  N.  H.  Winchell. 
13th  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  of  Minn,  for  1884,  pp.  20-24.  The  Crys- 
talline Rocks  of  Minnesota,  N.  H.  Winchell.     Ibid.,  pp.  36-38. 
169  Fossils  from  the  Red  Quartzite  at  Pipestone,  N.  H.  Winchell.     Ibid.,  pp.  65-72. 
,7° Notes  on  the  Geology  of  Minnehaha  County,  Dakota,  Warren  Upham.     Ibid.,  pp. 
88-97. 
171  The  Crystalline  Rocks  of  the  Northwest,  N.  H.  Winchell.     Ibid.,  pp.  124-140. 
172  Report  of  Geological  Observations  made  in  Northeastern  Minnesota  during  the 
Season  of  1886,  Alexander  Winchell.  15th  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  of 
Minn,  for  1886,  pp.  5-207. 
173  Geological  Report  of  N.  H.  Winchell.     Ibid.,  pp.  209-399,  with  a  map. 
174  Report  of  N.  H.  Winchell.  16th  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  of  Min- 
nesota for  1887,  pp.  13-129. 
175  Report  of  Alexander  Winchell.  Ibid.,  pp.  133-391.  See  also  The  Unconformities 
of  the  Animikie  in  Minnesota.  Am.  Geol.,  vol.  I,  pp.  14-24;  Two  Systems  Confounded 
in  the  Huronian.  Ibid.,  vol.  ill,  pp.  212-214,  339-340.  Systematic  Results  of  a  Field 
Study  of  the  Archean  Rocks  of  the  Northwest.  Proc.  Am.  Assoc.  Adv.  Sci.,  37th 
Meeting,  p.  205;  The  Geological  Position  of  the  Ogishki  Conglomerate.  Ibid.,  1889, 
38th  Meeting,  pp.  234-235. 
176 Report  of  H.  V.  Winchell.  Sixteenth  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey 
of  Minn,  for  1887,  pp.  395^62,  with  map. 
177  A  Great  Primordial  Quartzite,  N.  H.  Winchell.  Am.  Geol.,  vol.  I,  pp.  173-178.' 
See,  also,  Seventeenth  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey  of  Minn,  for  1888,  pp. 
25-56. 
178  Report  of  N.  H.  Winchell.  Seventeenth  Ann.  Rept.  Geol.  and  Nat.  Hist.  Survey 
of  Minn,  for  1888,  pp.  5-74 ;  see  also  The  Animikie  Black  Slates  and  Quartzites,  and 
the  Ogishki  Conglomerate  of  Minnesota,  the  equivalent  of  the  "  Original  Huronian." 
Am.  Geol.,  vol.  i,  pp.  11-14;  Methods  of  Stratigraphy  in  Studying  the  Huronian. 
Ibid.,  vol.  iv,  pp.  342-357. 
