﻿396 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  los 
  

  

  was 
  the 
  first 
  to 
  point 
  out 
  that 
  certain 
  genera 
  were 
  common 
  to 
  the 
  

   Oligocene 
  deposits 
  of 
  Eastern 
  Asia 
  and 
  the 
  intermountain 
  basins. 
  

   Also 
  should 
  be 
  mentioned 
  the 
  work 
  of 
  the 
  late 
  Dr. 
  W. 
  D. 
  Matthew 
  on 
  

   the 
  fauna 
  of 
  Pipestone 
  Springs, 
  which 
  is 
  the 
  only 
  study 
  on 
  a 
  single 
  

   fauna 
  which 
  has 
  been 
  made 
  on 
  any 
  of 
  the 
  intermountain 
  basins. 
  

  

  As 
  part 
  of 
  the 
  salvage 
  program 
  being 
  carried 
  out 
  by 
  the 
  River 
  Basin 
  

   Surveys 
  of 
  the 
  Smithsonian 
  Institution 
  in 
  the 
  reservoir 
  sites 
  in 
  the 
  

   Missouri 
  Valley, 
  the 
  fossUiferous 
  localities 
  in 
  the 
  Canyon 
  Ferry 
  Reser- 
  

   voir 
  area 
  have 
  been 
  prospected 
  for 
  fossils 
  for 
  three 
  seasons. 
  In 
  1947, 
  

   the 
  first 
  season 
  of 
  work, 
  largely 
  reconnaissance, 
  I 
  was 
  assisted 
  by 
  

   John 
  C. 
  Donohoe, 
  now 
  a 
  student 
  at 
  the 
  University 
  of 
  New 
  Mexico; 
  

   in 
  1948, 
  by 
  Mr. 
  Donohoe 
  and 
  Ernest 
  L. 
  Lundelius, 
  now 
  a 
  graduate 
  

   student 
  at 
  the 
  University 
  of 
  Chicago; 
  and, 
  in 
  1950, 
  by 
  William 
  C. 
  

   Harrup, 
  Jr., 
  a 
  student 
  at 
  Columbia 
  University, 
  and 
  Prentiss 
  Shep- 
  

   herd, 
  Jr., 
  a 
  student 
  at 
  Harvard 
  University. 
  With 
  the 
  aid 
  of 
  these 
  

   sharp-eyed 
  young 
  men 
  a 
  collection 
  of 
  nearly 
  300 
  specimens 
  was 
  ob- 
  

   tained 
  from 
  the 
  several 
  localities 
  in 
  the 
  reservoir 
  area, 
  the 
  basis 
  of 
  

   this 
  study. 
  These 
  specimens 
  are 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  (USNM 
  ) 
  . 
  

   In 
  addition. 
  Dr. 
  Kay 
  has 
  given 
  me 
  free 
  access 
  to 
  the 
  material 
  from 
  the 
  

   reservoir 
  area 
  in 
  the 
  Carnegie 
  Museum 
  (CM) 
  which 
  has 
  materially 
  

   supplemented 
  the 
  collection 
  of 
  the 
  River 
  Basin 
  Surveys. 
  

  

  The 
  graphic 
  art 
  of 
  William 
  D. 
  Crockett 
  has 
  been 
  invaluable 
  in 
  por- 
  

   traying 
  the 
  characters 
  of 
  the 
  more 
  interesting 
  specimens. 
  

  

  In 
  the 
  discussion 
  of 
  the 
  specimens, 
  the 
  localities 
  from 
  which 
  they 
  

   were 
  obtained 
  are 
  indicated 
  by 
  code 
  numbers 
  according 
  to 
  the 
  system 
  

   used 
  by 
  the 
  Missouri 
  Valley 
  Project 
  of 
  the 
  Smithsonian 
  River 
  Basin 
  

   Surveys. 
  Following 
  is 
  a 
  list 
  of 
  these 
  localities. 
  

  

  Lower 
  Oligocene 
  (Chadronian) 
  Localities 
  

  

  24LC16. 
  NE}^SW}^, 
  sec. 
  3, 
  T. 
  10 
  N., 
  R. 
  1 
  W., 
  of 
  the 
  Montana 
  prime 
  

   meridian, 
  about 
  1 
  mile 
  north 
  of 
  Canyon 
  Ferry, 
  Lewis 
  and 
  Clark 
  

   County, 
  Mont, 
  This 
  is 
  a 
  small 
  area 
  of 
  badlands 
  at 
  the 
  foot 
  of 
  the 
  

   bluff 
  on 
  which 
  the 
  buildings 
  of 
  the 
  permanent 
  oflSces 
  of 
  the 
  project 
  

   are 
  built 
  (fig. 
  40). 
  About 
  130 
  feet 
  of 
  light 
  buff 
  ashy 
  clays 
  are 
  exposed 
  

   at 
  this 
  locality 
  with 
  Chadronian 
  fossils 
  in 
  the 
  upper 
  half. 
  Only 
  the 
  

   remains 
  of 
  the 
  smaller 
  mammals 
  were 
  suflSciently 
  well 
  preserved 
  for 
  

   identification. 
  

  

  24BW18. 
  NWKSEK 
  sec. 
  7, 
  T. 
  9 
  N., 
  R. 
  1 
  E., 
  of 
  the 
  Montana 
  prune 
  

   meridian, 
  about 
  1% 
  miles 
  southwest 
  of 
  the 
  south 
  end 
  of 
  Lake 
  Sewell, 
  

   Broadwater 
  County, 
  Mont. 
  This 
  locality 
  (fig. 
  41) 
  was 
  originally 
  dis- 
  

   covered 
  by 
  Dr. 
  Kay, 
  who 
  very 
  generously 
  directed 
  the 
  River 
  Basin 
  

   Surveys 
  to 
  it. 
  Lithologically, 
  the 
  deposits 
  in 
  this 
  area 
  do 
  not 
  differ 
  

   materially 
  from 
  those 
  of 
  the 
  preceding 
  locality, 
  nor 
  does 
  the 
  species 
  

  

  