LAKE   SUPERIOR   REGION.  387 
7  Report  of  J.  D.  Whitney.  Senate  Does.,  2d  sess.  30th  Cong.,  1848-49,  vol.  2, 
No.  2,  pp.  154-159. 
8  Report  of  J.  W.  Foster.     Idem,  pp.  159-163. 
9  The  Lake  Superior  copper  and  iron  district,  by  J.  D.  Whitney.  Proc.  Boston 
Soc.  Nat.  Hist.,  vol.  3,  1849,  pp.  210-212. 
10  On  the  geological  structure  of  Keweenaw  Point,  by  Charles  T.  Jackson. 
Proc.  Am.  Assoc.  Adv.  Sci.,  1849,  2d  meeting,  pp.  288-301. 
11  Report  on  the  geological  and  minera logical  survey  of  the  mineral  lands  of 
the  United  States  in  the  State  of  Michigan,  by  Charles  T.  Jackson.  Senate 
Docs.,  1st  sess.  31st  Cong.,  1849-50,  vol.  3,  No.  1,  pp.  371-935,  with  14  maps. 
Contains  reports  by  Messrs.  Jackson,  Dickenson,  Mclntyre,  Barnes,  Locke,  Foster 
and  Whitney,  Whitney,  Gibbs,  Whitney,  jr.,  Hill  and  Foster,  Foster,  Burt, 
Hubbard. 
12  Idem,  pp.  371-503. 
13  United  States  geological  survey  of  public  lands  in  Michigan ;  field  notes,  by 
John  Locke.     Idem,  pp.  572-587. 
14  Synopsis  of  the  explorations  of  the  geological  corps  in  the  Lake  Superior 
land  district  in  the  Northern  Peninsula  of  Michigan,  by  J.  W.  Foster  and  J.  D. 
Whitney.     Idem,  pp.  605-326,  with  4  maps. 
15  Notes  on  the  topography,  soil,  geology,  etc.,  of  the  district  between  Portage 
Lake  and  the  Ontonagon,  by  J.  D.  Whitney.  Idem,  pp.  649-666.  Report  of 
J.  D.  Whitney.     Idem,  pp.  705-711. 
"Report  of  J.  W.  Foster.  Idem,  pp.  766-772.  Notes  on  the  geology  and 
topography  of  the  country  adjacent  to  Lakes  Superior  and  Michigan,  in  the 
Chippewa  land  district,  by  J.  W.  Foster.       Idem,  pp.  773-786. 
17  Topography  and  geology  of  the  survey  with  reference  to  mines  and 
minerals,  of  a  district  of  township  lines  south  of  Lake  Superior,  by  William 
A.  Burt.     Idem,  pp.  811-832,  with  a  geological  map  opposite  p.  880. 
18  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.     Idem,  pp.  833-842. 
19  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.  Idem,  pp.  842-882,  with  a  geological 
map. 
20  Report  on  the  geology  and  topography  of  the  Lake  Superior  land  district ; 
part  1,  Copper  lands,  by  J.  W.  Foster  and  J.  D.  Whitney.  Executive  Docs.,  1st 
sess.  31st  Cong.,  1849-50,  vol.  9,  No.  69,  p.  244,  with  map. 
21  Report  on  the  geology  and  topography  of  the  Lake  Superior  land  district ; 
part  2,  The  iron  region,  by  J.  W.  Foster  and  J.  D.  Whitney.  Senate  Docs., 
special  sess.  32d  Cong.,  1851,  vol.  3,  No.  4,  406  pp.,  with  maps.  See  also  Apergu 
de  l'ensemble  des  terrains  Siluriens  du  Lac.  Superieur,  by  J.  W.  Foster  and 
J.  D.  Whitney.     Bull.  Soc.  geol.  France,  vol.  2,  1850,  pp.  89-100. 
22  On  the  Azoic  system,  as  developed  in  the  Lake  Superior  land  district,  by 
J.  W.  Foster  and  J.  D.  Whitney.  Proc.  Am.  Assoc.  Adv.  Sci.,  1851,  5th  meeting. 
pp.  4-7. 
23  On  the  age  of  the  sandstone  of  Lake  Superior,  with  a  description  of  the  phe- 
nomena of  the  association  of  igneous  rocks,  by  J.  W.  Foster  and  J.  D.  Whitney. 
Idem,  pp.  22-38. 
24  Geology,  mineralogy,  and  topography  of  the  lands  around  Lake  Superior,  by 
Charles  T.  Jackson.  Senate  Docs.,  1st  sess.  32d  Cong.,  1851-52,  vol.  11,  pp. 
232-244. 
25  Age  of  the  Lake  Superior  sandstone,  by  Charles  T.  Jackson.  Proc.  Boston 
Soc.  Nat.  Hist.,  vol.  7,  1860,  pp.  396-398. 
