392  PRE-CAMBRIAN    GEOLOGY   OF    NORTH    AMERICA. 
109  Geology  of  central  Wisconsin,  by  R.  1).  Irving.  Geology  of  Wisconsin,  vol. 
2,  1873-1877,  pp.  409-036,  with  2  atlas  maps. 
110  On  the  geology  of  northern  Wisconsin,  by  R.  D.  Irving.  Ann.  Rept.  Wis- 
consin Geol.  Survey  for  1877,  pp.  17-25. 
111  Report  on  the  eastern  part  of  the  Penokee  range,  by  T.  C.  Chamberlin. 
Idem,  pp.  25-29. 
112  General  geology  of  the  Lake  Superior  region,  by  R.  D.  Irving.  Geology  of 
Wisconsin,  vol.  3,  1880,  pp.  1-24.  Geology  of  the  eastern  Lake  Superior  district. 
Idem,  pp.  51-238,  with  6  atlas  maps.  Mineral  resources  of  Wisconsin.  Trans. 
Am.  Inst.  Min.  Eng.,  vol.  8,  18S0,  pp.  478-508,  with  map.  Note  on  the  stratigraphy 
of  the  Huronian  series  of  northern  Wisconsin,  and  on  the  equivalency  of  the 
Huronian  of  the  Marquette  and  Penokee  districts.  Am.  Jour.  Sci.,  3d  ser.,  vol. 
17,  1879,  pp.  393-398. 
113  Huronian  series  west  of  Penokee  Gap,  by  C.  E.  Wright.  Geology  of  Wis- 
consin, vol.  3,  1880,  pp.  241-301,  with  an  atlas  map. 
114  Geology  of  the  western  Lake  Superior  district,  by  E.  T.  Sweet.  Idem,  pp. 
303-362,  with  an  atlas  map. 
115  Geology  of  the  upper  St.  Croix  district,  by  T.  C.  Chamberlin  and  Moses 
Strong.     Idem,  pp.  363-428,  with  2  atlas  maps. 
116  Geology  of  the  Menominee  region,  by  T.  B.  Brooks.  Idem,  pp.  430-599, 
with  3  atlas  maps. 
117  Geology  of  the  Menominee  iron  region  (economic  resources,  lithology,  and 
westerly  and  southerly  extension ) ,  by  Charles  E.  Wright.     Idem,  pp.  666-734. 
118  The  quartzites  of  Barron  and  Chippewa  counties,  by  Moses  Strong,  E.  T. 
Sweet,  F.  H.  Brotherton,  and  T.  C.  Chamberlin.  Geology  of  Wisconsin,  vol.  4, 
1873-1879,  pp.  573-5S1. 
119  Geology  of  the  upper  Flambeau  Valley,  by  F.  H.  King.     Idem,  pp.  583-615. 
120  Crystalline  rocks  of  the  Wisconsin  Valley,  by  R.  D.  Irving  and  C.  R.  Van 
Hise.    Idem,  pp.  623-714. 
121  General  geology  (of  Wisconsin),  by  T.  C.  Chamberlin.  Geology  of  Wis- 
consin, vol.  1,  1883,  pp.  3-300,  with  an  atlas  map. 
122  Lithology  of  Wisconsin,  by  R.  D.  Irving.     Idem,  pp.  340-361. 
123  Transition  from  the  copper-bearing  series  to  the  Potsdam,  by  L.  C.  Wooster. 
Am.  Jour.  Sci.,  3d  ser.,  vol.  27,  1SS4,  pp.  463-465. 
124  Geology  of  the  St.  Croix  Dalles,  by  C.  P.  Berkey.  Am.  Geologist,  vol.  20, 
1897,  pp.  345-383 ;  vol.  21,  1898,  pp.  139-155,  270-294. 
125  Preliminary  report  on  copper-bearing  rocks  in  Douglas  County,  Wis.,  by 
IT.  S.  Grant.    Bull.  Wisconsin  Geol.  and  Nat.  Hist.  Survey  No.  6,  1901. 
126  The  pre-Potsdam  peneplain  of  the  pre-Cambrian  of  north-central  Wiscon- 
sin, by  S.  Weidman.     Jour.  Geology,  vol.  11,  1903,  pp.  289-313. 
127  Unpublished  thesis,  Univ.  Wisconsin,  1905. 
128  The  geology  of  north-central  Wisconsin,  by  S.  Weidman.  Bull.  Wisconsin 
Geol.  and  Nat.  Hist.  Survey  No.  16,  1907.  Summary  furnished  by  author  in 
1905. 
129  Summary  furnished  by  S.  Weidman,  1908. 
130  Account  of  a  journey  to  the  Coteau  des  Prairies,  with  a  description  of  the 
red  Pipestone  quarry  and  granite  bowlders  found  there,  by  George  Catlin.  Am. 
Jour.  Sci.,  1st  ser.,  vol.  38,  1840,  pp.  138-146. 
131  Report  of  J.  G.  Norwood.  Senate  Docs.,  1st  sess.  30th  Cong.,  1847,  vol.  2, 
No.  2,  pp.  73-134. 
132  Description  of  the  geology  of  middle  and  western  Minnesota ;  including  the 
country  adjacent  to  the  northwest  and  part  of  the  southwest  shore  of  Lake  Supe- 
rior;  illustrated  by  numerous  general  and  local  sections,  woodcuts,  and  a  map,  by 
