ISOLATED   AREAS   IN    MISSISSIPPI   VALLEY.  •     751 
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229-245.  Geological  report  of  exploration  on  the  Yellowstone  and  Missouri 
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3S  On  the  geology  and  natural  history  of  the  upper  Missouri,  by  F.  V.  Hayden. 
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and  Kansas,  based  upon  information  obtained  during  an  expedition  to  the 
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40  Geological  report  on  the  Black  Hills  of  Dakota,  by  X.  II.  Winchell.  Report 
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by  William  Ludlow,  pp.  21-66,  with  a  geological  map. 
41  Report  on  the  geology  and  resources  of  the  Black  Hills  of  Dakota,  by  Henry 
Newton  and  Walter  P.  Jenney.  TJ.  S.  Geog.  and  Geol.  Survey  Rocky  Mtu. 
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42Tin  ore  in  the  Black  Hills  of  Dakota,  by  William  P.  Blake.  Mineral  Re- 
sources U.  S.  for  1883  and  1884,  pp.  602-613. 
"Geology  of  the  Black  Hills  of  Dakota,  by  W.  <  >.  Crosby.  Proc.  Boston 
Soc.  Nat.  Hist,  vol.  23.  1884-1888,  pp.  488-517. 
"Notes  on  the  geology  of  the  Black  Hills,  by  Franklin  R.  Carpenter.  Prelim 
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Soc.  America,  vol.  1,  1890,  pp.  203  211. 
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South  Dakota  Geol.  Survey  No.  2.  1898,  pp.  27-40. 
4S  Notes  on  the  northern  Black  Hills  of  South  Dakota,  l».\  Persifor  Frazer. 
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49A  contribution  to  the  geology  of  the  northern  Black  Hills,  by  John  Duer 
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50The  laccoliths  <,f  the  Black  Hills,  hy  T.  A.  Jaggar,  jr.  Twenty  lirst  Ann. 
Rept.  U.  S.  Geol.  Survey,  pi.  3,  L901,  pp.  171   303. 
51  Economic  resources  of  the  northern  Black  Hills.  I>\  .1.  D.  Irving;  pi.  1. 
General  geology,  by  T.  A.  Jaggar,  jr.  Prof.  Paper  r.  s.  Geol.  Survey  No.  26, 
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