202  PRE-CAMBRIAN   ROCKS    OF   NORTH    AMERICA.  .[bull.  86. 
6rt  Synopsis  of  the  Explorations  of  the  Geological  Corps  in  the  Lake  Superior  Land 
District  in  the  Northern  Peninsula  of  Michigan,  J.  W.  Foster  and  J.  D.  Whitney. 
Ibid.,  pp.  605, 626,  with  4  maps. 
67  Notes  on  the  Topography,  Soil,  Geology,  etc.,  of  the  District  between  Portage 
Lake  and  the  Ontonagon,  J.  D.  Whitney.  Ibid.,  pp.  649-666.  Report  of  J.  D.  Whit- 
ney.   Ibid.,  pp.  705-711. 
68  Report  of  J.  W.  Foster.  Ibid.,  pp.  766-772.  Notes  on  the  Geology  and  Topog- 
raphy of  the  Country  Adjacent  to  Lakes  Superior  and  Michigan,  in  the  Chippewa 
Land  District,  J.  W.  Foster.     Ibid.,  pp.  773-786. 
69  Topography  and  Geology  of  the  Survey  with  reference  to  Mines  and  Minerals,  of 
a  district  of  township  lines  south  of  Lake  Superior,  William  A.  Burt.  Ibid.,  pp. 
811-832.     With  a  geological  map  opposite  p.  880. 
70  General  Observations  upon  the  Geology  and  Topography  of  the  District  south 
of  Lake  Superior,  subdivided  in  1845  under  direction  of  Douglass  Houghton,  Deputy 
Surveyor,  Bela  Hubbard.     Ibid.,  pp.  833-842. 
71  Geological  Report  of  the  Survey  "  with  reference  to  Mines  and  Minerals,"  of  a 
district  of  township  lines  in  the  State  of  Michigan,  in  the  year  1846,  and  tabular 
statement  of  specimens  collected.     Ibid.,  pp.  842-882,  with  a  geological  map. 
72  Report  on  the  Geology  and  Topography  of  the  Lake  Superior  Land  District, 
part  1,  Copper  Lands,  J.  W.  Foster  and  J.  D.  Whitney.  Executive  Docs.,  1st  sess. 
31st  Cong.,  1849-'50,  vol.  IX,  No.  69,  p.  244,  with  map. 
73  Report  on  the  Geology  and  Topography  of  the  Lake  Superior  Land  District, 
part  2,  the  Iron  Region,  J.  W.  Foster  and  J.  D.  Whitney.  Senate  Docs.,  special 
sess.  32d  Cong.,  1851,  vol.  in,  No.  4,  406  pp.,  with  maps.  See  also  Apercu  de 
l'ensemble  des  Terrains  Siluriens  du  Lac  Superieur,  by  J.  W.  Foster  and  J.  D.  Whit- 
ney. '  Bull.  Soc.  G6ol.  France,  1850  (2),  pp*  89-100. 
74  On  the  Azoic  System,  as  developed  in  the  Lake  Superior  Land  District,  J.  W. 
Foster  and  J.  D.  Whitney.     Proc.  Am.  Assoc.  Adv.  Sci.,  1851,  5th  meeting,  pp.  4-7. 
75  On  the  Age  of  the  Sandstone  of  Lake  Superior,  with  a  Description  of  the  Phe- 
nomena of  the  Association  of  Igneous  Rocks,  J.  W.  Foster  and  J.  D.  Whitney. 
Ibid.,  pp.  22-38. 
76  Abstract  of  an  Introduction  to  the  Final  Report  of  the  Geological  Surveys  made 
in  Wisconsin,  Iowa,  and  Minnesota,  in  the  years  1847, 1848, 1849  and  1850,  contain- 
ing a  Synopsis  of  the  Geological  Features  of  the  Country,  David  D.  Owen.  Ibid.,  pp. 
119-132. 
77  On  the  Age,  Character,  and  True  Geological  Position  of  the  Lake  Superior  Red 
Sandstone  Formation,  David  D.  Owen.  Report  of  a  Geological  Survey  of  Wiscon- 
sin, Iowa,  and  Minnesota,  pp.  187-193. 
78 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,  - 
J.  G.  Norwood.     Ibid.,  pp.  209-418. 
79  Description  of  part  of  Wisconsin  South  of  Lake  Superior,  Charles  Whittlesey. 
Ibid.,  pp.  419-470. 
80  Local  Details  of  Geological  Sections  on  the  St.  Peters,  Wisconsin,  Mississippi, 
Baraboo,  Snake,  and  Kettle  rivers,  B.  F.  Shumard.     Ibid.,  pp.  475-522. 
81  Geology,  Mineralogy,  and  Topography  of  the  Lands  around  Lake  Superior, 
Charles  T.  Jackson.     Senate  Docs.,  1st  sess.  32d  Cong.,  1851-'52,  vol.  xi,  pp.  232-244. 
82  A  Geological  Map  of  the  United  States  and  the  British  Provinces  of  North  Amer- 
ica, with  an  Explanatory  Text,  Geological  Sections,  etc.,  Jules  Marcou.  Boston, 
1853,  p.  92.  See  also  "Reponse  a  la  Lettre  de  MM.  Foster  et  Whitney  sur  le  Lac 
Superieur,"  Jules  Marcou.     Bull.  Soc.  Ge"ol.,  France,  2d  series,  vol.  vni,  pp.  101-105. 
83  The  Metallic  Wealth  of  the  United  States,  J.  D.  Whitney.  Philadelphia,  1854, 
Henry  R.  Schoolcraft.     510  pp. 
•♦Observations  on  the  Geology  and  Mineralogy  of  the  Region  embracing  the 
