﻿94 
  Hatcher 
  — 
  Sedimentary 
  Rocks 
  of 
  Southern 
  Patagonia. 
  

  

  rising 
  in 
  the 
  same 
  range 
  of 
  bluffs. 
  In 
  this 
  region 
  these 
  beds 
  

   have 
  an 
  estimated 
  thickness 
  of 
  500 
  feet. 
  They 
  also 
  occur 
  in 
  

   limited 
  areas 
  along 
  the 
  upper 
  course 
  of 
  the 
  Rio 
  Chalia 
  or 
  

   Shehuen 
  and 
  at 
  intervals 
  over 
  the 
  central 
  interior 
  region 
  lying 
  

   between 
  Port 
  Desire 
  and 
  the 
  eastern 
  base 
  of 
  the 
  Andes. 
  In 
  

   the 
  latter 
  region 
  they 
  are 
  usually 
  found 
  occupying 
  depressions 
  

   eroded 
  in 
  the 
  surface 
  of 
  the 
  variegated 
  sandstones 
  and 
  of 
  cer- 
  

   tain 
  porphyries 
  and 
  basalts 
  of 
  unknown 
  age 
  that 
  occur 
  here 
  

   over 
  considerable 
  areas. 
  

  

  The 
  Guaranitic 
  beds 
  contain 
  fairly 
  abundant 
  Dinosaurian 
  

   remains, 
  but 
  several 
  weeks 
  spent 
  in 
  them 
  at 
  different 
  times 
  

   and 
  in 
  various 
  localities 
  has 
  resulted 
  in 
  a 
  fruitless 
  search 
  for 
  

   representatives 
  of 
  that 
  rich, 
  varied 
  and 
  highly 
  specialized 
  mam- 
  

   malian 
  fauna 
  which 
  they 
  are 
  said 
  by 
  Dr. 
  Florentino 
  Ameghino 
  

   to 
  contain. 
  On 
  the 
  other 
  hand, 
  Senor 
  Carlos 
  Ameghino, 
  who 
  

   has 
  collected 
  most 
  of 
  the 
  material 
  for 
  his 
  brother 
  Florentino, 
  

   assured 
  the 
  writer, 
  during 
  an 
  interview 
  with 
  him 
  in 
  Santa 
  Cruz, 
  

   in 
  July, 
  1898, 
  that 
  he 
  had 
  never 
  found 
  either 
  Pyrotherium 
  or 
  

   any 
  other 
  representatives 
  of 
  the 
  Pyrotherium 
  fauna 
  associated 
  

   with 
  Dinosaurian 
  remains. 
  Carlos 
  Ameghino 
  was 
  very 
  posi- 
  

   tive 
  in 
  his 
  statements 
  to 
  me 
  regarding 
  this 
  matter, 
  and 
  when 
  

   shown 
  Dr. 
  Ameghino's 
  statements 
  on 
  this 
  subject 
  as 
  translated 
  

   and 
  published 
  in 
  The 
  Geological 
  Magazine 
  of 
  January, 
  1897, 
  

   in 
  an 
  article 
  entitled 
  " 
  Geology 
  and 
  Paleontology 
  of 
  Argen- 
  

   tina," 
  he 
  said 
  that 
  there 
  had 
  been 
  a 
  mistake 
  in 
  the 
  translation 
  

   or 
  that 
  his 
  brother 
  had 
  entirely 
  mistaken 
  his 
  statements 
  con- 
  

   cerning 
  the 
  manner 
  in 
  which 
  he 
  had 
  found 
  the 
  fossils 
  of 
  the 
  

   respective 
  faunas. 
  He 
  also 
  informed 
  me 
  on 
  the 
  same 
  occasion 
  

   that 
  previous 
  to 
  the 
  expedition 
  from 
  which 
  he 
  had 
  then 
  but 
  

   just 
  returned 
  to 
  Santa 
  Cruz, 
  he 
  had 
  never 
  found 
  any 
  mam- 
  

   malian 
  remains 
  whatsoever 
  associated 
  with 
  the 
  remains 
  of 
  

   Dinosaurs. 
  On 
  his 
  last 
  trip 
  however 
  he 
  said 
  he 
  had 
  found 
  a 
  

   few 
  small 
  multituberculate 
  teeth 
  associated 
  with 
  Dinosaurian 
  

   remains 
  in 
  the 
  Guaranitic 
  beds 
  on 
  the 
  upper 
  course 
  of 
  the 
  

   Rio 
  Shehuen. 
  These 
  are 
  Senor 
  Carlos 
  Ameghino's 
  statements 
  

   to 
  me 
  concerning 
  the 
  stratigraphic 
  relations 
  .of 
  these 
  Dino- 
  

   saurian 
  and 
  Mammalian 
  faunas. 
  It 
  will 
  be 
  noticed 
  that 
  they 
  

   agree 
  on 
  the 
  whole 
  with 
  the 
  published 
  statements 
  of 
  Drs. 
  

   Santiago 
  Roth 
  and 
  Alcides 
  Mercerat. 
  They 
  also 
  explain 
  why 
  I 
  

   have 
  been 
  unable 
  to 
  find 
  the 
  Pyrotherium 
  fauna 
  associated 
  

   with 
  the 
  Dinosaurs. 
  Such 
  mistakes 
  based 
  on 
  misunderstand- 
  

   ings 
  are 
  always 
  liable 
  to 
  occur, 
  and 
  are 
  excusable 
  where, 
  as 
  was 
  

   the 
  case 
  in 
  this 
  instance, 
  the 
  author 
  was 
  recording 
  not 
  his 
  own 
  

   observations 
  but 
  the 
  impressions 
  left 
  upon 
  him 
  by 
  the 
  narration 
  

   of 
  the 
  observations 
  of 
  another, 
  made 
  in 
  a 
  region 
  with 
  which 
  he 
  

   was 
  himself 
  not 
  only 
  unfamiliar 
  but 
  entirely 
  unacquainted. 
  

  

  The 
  Guaranitic 
  beds 
  are 
  referred 
  to 
  the 
  Upper 
  Cretaceous 
  

   both 
  upon 
  stratigraphic 
  and 
  paleontologic 
  evidences. 
  Just 
  

  

  