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  8. 
  Roth 
  — 
  Some 
  remarks 
  on 
  the 
  latest 
  

  

  lies 
  above 
  the 
  classical 
  Patagonian, 
  and 
  that 
  the 
  latter 
  belongs 
  

   partly 
  to 
  the 
  Lower 
  Eocene, 
  partly 
  to 
  the 
  Cretaceous. 
  The 
  

   Tehuelche 
  formation 
  has 
  suffered 
  a 
  change 
  still 
  more 
  incom- 
  

   prehensible 
  ; 
  in 
  1889 
  (1. 
  c.) 
  we 
  find 
  it 
  on 
  top 
  of 
  the 
  Fampean 
  

   formation, 
  which 
  is, 
  according 
  to 
  him, 
  Pliocene, 
  and 
  consists 
  

   of 
  the 
  stages 
  : 
  Ensenadense 
  (Pamp. 
  inf.), 
  Belgranense 
  (Pamp. 
  

   med.), 
  Bonaerense 
  (Pamp. 
  sup.) 
  and 
  Lujanense 
  (Pamp. 
  lacus- 
  

   tre) 
  ; 
  the 
  Tehuelche 
  ought 
  to 
  be, 
  accordingly, 
  Quarternary, 
  

   which 
  is 
  the 
  opinion 
  of 
  others. 
  But 
  in 
  his 
  latest 
  paper* 
  he 
  

   puts 
  it 
  in 
  the 
  Lower 
  Miocene 
  ! 
  

  

  Ameghino 
  has 
  never 
  seen 
  any 
  Patagonian 
  deposits 
  with 
  his 
  

   own 
  eyes, 
  and 
  bases 
  his 
  divisions 
  and 
  theories, 
  which 
  he 
  pro- 
  

   pounds 
  in 
  every 
  case 
  as 
  well 
  proved 
  facts, 
  upon 
  the 
  reports 
  of 
  

   other 
  investigators, 
  chiefly 
  upon 
  the 
  alleged 
  observations 
  of 
  his 
  

   brother 
  Carlos. 
  There 
  is 
  no 
  doubt 
  that 
  his 
  present 
  division 
  

   will 
  meet 
  the 
  same 
  fate 
  as 
  all 
  the 
  rest 
  : 
  indeed, 
  it 
  will 
  be 
  shown 
  

   that 
  it 
  is 
  even 
  less 
  tenable 
  than 
  those 
  given 
  previously 
  by 
  

   him; 
  and 
  it 
  is 
  very 
  significant, 
  that 
  he 
  begins 
  already 
  new 
  

   changes 
  immediately 
  after 
  the 
  conclusion 
  of 
  his 
  latest 
  paper. 
  

  

  As 
  to 
  the 
  correlations 
  of 
  the 
  formations 
  investigated 
  by 
  

   myself 
  in 
  the 
  territories 
  of 
  Pio 
  Negro 
  and 
  Neuquen 
  with 
  this 
  

   absurd 
  division, 
  I 
  wish 
  to 
  make 
  the 
  following 
  statements. 
  

  

  1. 
  In 
  the 
  "Suplemento" 
  he 
  says: 
  " 
  Piso 
  Pyrotheriense. 
  

   Mr. 
  Poth 
  has 
  observed 
  very 
  extensively 
  the 
  beds 
  of 
  this 
  stage, 
  

   which 
  he 
  designates 
  as 
  " 
  Toba 
  (tufa) 
  cretacea," 
  in 
  the 
  terri- 
  

   tories 
  of 
  Chubut 
  and 
  Santa 
  Cruz, 
  and 
  has 
  found 
  in 
  them, 
  at 
  

   different 
  localities, 
  bones 
  of 
  Sauriansand 
  Mammals." 
  The 
  fact 
  

   is, 
  that 
  I 
  have 
  never 
  been 
  farther 
  south 
  than 
  the 
  Pio 
  Deseado, 
  

   and 
  that 
  I 
  have 
  never 
  found, 
  in 
  these 
  Cretaceous 
  tufas, 
  any 
  

   remains 
  of 
  the 
  Pyrotherium 
  fauna 
  described 
  by 
  Ameghino, 
  

   but 
  of 
  a 
  fauna 
  entirely 
  different 
  from 
  it. 
  On 
  my 
  last 
  voyage, 
  

   however, 
  I 
  found 
  representatives 
  of 
  a 
  great 
  number 
  of 
  genera 
  

   and 
  species 
  belonging 
  to 
  his 
  Pyrotherium 
  fauna 
  in 
  deposits 
  of 
  

   a 
  loess-like 
  character 
  and 
  of 
  much 
  younger 
  age, 
  but 
  so 
  far 
  no 
  

   traces 
  of 
  the 
  genus 
  Pyrotherium 
  itself. 
  I 
  have 
  long 
  doubted 
  

   that 
  the 
  genus 
  Pyrotherium 
  is 
  represented 
  in 
  the 
  same 
  beds 
  

   with 
  the 
  other 
  genera 
  of 
  this 
  fauna, 
  and 
  the 
  same 
  doubt 
  has 
  

   been 
  expresssd 
  by 
  Mr. 
  Hatcher, 
  who 
  has 
  traveled 
  several 
  years 
  

   in 
  Southern 
  Patagonia, 
  and 
  has 
  made 
  extensive 
  collections. 
  

   And, 
  indeed, 
  Ameghino, 
  after 
  having 
  met 
  Mr. 
  Hatcher, 
  

   changes 
  his 
  former 
  ideas 
  as 
  to 
  the 
  Pyrotherium 
  fauna. 
  In 
  the 
  

   conclusion 
  of 
  his 
  supplement 
  (1. 
  c, 
  p. 
  13) 
  he 
  says 
  in 
  a 
  supple- 
  

   mentary 
  note 
  : 
  " 
  According 
  to 
  information 
  sent 
  to 
  me 
  by 
  

   Carlos 
  Ameghino 
  regarding 
  the 
  explorations 
  made 
  during 
  his 
  

   last 
  voyage 
  from 
  Puerto 
  Deseado, 
  it 
  has 
  now 
  been 
  settled 
  that 
  

   what 
  we 
  have 
  called 
  the 
  Pyrotherium 
  fauna 
  consists 
  really 
  of 
  

  

  *Segundo 
  Censo, 
  etc. 
  

  

  