﻿Ortmann 
  — 
  Magellanian 
  Beds 
  of 
  Punta 
  Arenas. 
  427 
  

  

  Art. 
  XLIX. 
  — 
  The 
  Fauna 
  of 
  ihe 
  Magellanian 
  Beds 
  of 
  Punta 
  

   Arenas^ 
  Chile 
  ; 
  bj 
  Dr. 
  A. 
  E. 
  Ortmann. 
  

  

  By 
  the 
  term 
  " 
  Magellanian 
  beds 
  " 
  the 
  writer 
  designates 
  the 
  

   new 
  Tertiary 
  horizons'^ 
  discovered 
  by 
  Mr. 
  J. 
  B. 
  Hatcher 
  near 
  

   Pnnta 
  Arenas, 
  and 
  described 
  in 
  a 
  previous 
  article. 
  f 
  The 
  

   introduction 
  of 
  this 
  term 
  seems 
  to 
  be 
  the 
  more 
  appropriate, 
  

   since 
  the 
  stratigraphical 
  position 
  of 
  these 
  beds, 
  and 
  their 
  rela- 
  

   tion 
  to 
  the 
  Patagonian 
  beds, 
  is 
  known, 
  and 
  since 
  they 
  differ 
  in 
  

   their 
  paleontological 
  character 
  from 
  all 
  other 
  deposits 
  found 
  in 
  

   Patagonia. 
  For 
  the 
  present, 
  the 
  writer 
  intends 
  to 
  use 
  this 
  

   term 
  only 
  for 
  the 
  marine 
  beds, 
  underlying 
  the 
  Punta 
  Arenas 
  

   coal, 
  that 
  is 
  to 
  say, 
  for 
  horizons 
  II 
  and 
  III 
  of 
  the 
  paper 
  

   quoted. 
  

  

  Since 
  these 
  beds 
  reveal 
  the 
  true 
  geological 
  position 
  of 
  the 
  

   Punta 
  Arenas 
  coal 
  (between 
  the 
  Magellanian 
  and 
  Patagonian 
  

   beds), 
  and 
  since 
  there 
  seems 
  to 
  prevail, 
  as 
  regards 
  the 
  age 
  of 
  

   this 
  coal 
  or 
  lignite, 
  quite 
  an 
  uncertainty:}:, 
  it 
  is 
  well 
  to 
  give 
  a 
  

   more 
  detailed 
  report 
  on 
  this 
  " 
  Magellanian 
  " 
  fauna, 
  in 
  order 
  

   that 
  it 
  may 
  be 
  recognized, 
  if 
  found 
  elsewhere. 
  Since 
  it 
  is, 
  

   however, 
  impossible 
  at 
  present, 
  to 
  give 
  a 
  complete 
  account 
  of 
  

   this 
  fauna, 
  and 
  since 
  an 
  elaborate 
  description 
  ilkistrated 
  by 
  

   figures 
  of 
  the 
  new 
  species 
  is 
  at 
  present 
  impossible, 
  the 
  writer 
  

   has 
  decided 
  to 
  publish 
  as 
  soon 
  as 
  possible 
  a 
  short 
  preliminary 
  

   report 
  on 
  the 
  species 
  of 
  marine 
  fossils 
  recognized 
  in 
  these 
  beds, 
  

   taking 
  pains 
  to 
  characterize 
  the 
  new 
  forms 
  as 
  exactly 
  as 
  pos- 
  

   sible 
  chiefly 
  by 
  comparing 
  them 
  with 
  well 
  known 
  species. 
  

   Tl}e 
  final 
  report 
  on 
  these 
  and 
  other 
  invertebrate 
  fossils 
  col- 
  

   lected 
  by 
  Mr. 
  Hatcher 
  in 
  Patagonia 
  will 
  be 
  forthcoming 
  in 
  due 
  

   time. 
  

  

  Ostrea 
  torresi 
  Philippi 
  (Die 
  tertiaeren 
  und 
  quartaeren 
  Yer- 
  

   steinerungen 
  Chiles, 
  188T, 
  p. 
  215, 
  pi. 
  48, 
  f. 
  8). 
  

  

  Magellanian 
  beds, 
  upper 
  division 
  (horizon 
  III). 
  ]N"umerous 
  

   specimens 
  (21 
  lower, 
  14 
  upper 
  valves). 
  

  

  * 
  Ameghino 
  (Sinopsis 
  Geologico-Palseontologioa, 
  Suplemenlo, 
  1899, 
  p. 
  12) 
  has 
  

   tried 
  to 
  correlate 
  the 
  Punta 
  Arenas 
  seciion 
  with 
  the 
  Patagonian 
  deposits, 
  and 
  

   coDsiders 
  the 
  horizons 
  liere 
  under 
  discussion 
  (II 
  and 
  III) 
  as 
  belonging 
  partly 
  to 
  

   the 
  Upper 
  Patagonian 
  beds 
  (piso 
  leonense) 
  and 
  partly 
  to 
  the 
  transitional 
  beds 
  

   between 
  the 
  Patagonian 
  and 
  Suprapatagonian. 
  It 
  is, 
  however, 
  impossible 
  for 
  me 
  

   to 
  regard 
  a 
  deposit 
  as 
  Patagonian 
  that 
  does 
  not 
  contain 
  a 
  single 
  Patagonian 
  

   fossil. 
  The 
  so-c^lled 
  '-piso 
  leonense 
  " 
  (upper 
  part 
  of 
  Patagonian), 
  with 
  an 
  

   entirely 
  different 
  fauna, 
  which 
  has 
  not 
  been 
  described, 
  is 
  not 
  represented 
  in 
  Mr, 
  

   Hatcher's 
  collections, 
  although 
  the 
  latter 
  come 
  from 
  all 
  imaginable 
  horizons 
  

   within 
  the 
  Patagoniau-Suprapatagonian 
  series. 
  

  

  f 
  This 
  Journal. 
  December. 
  1898. 
  

  

  X 
  Compare 
  0. 
  Nordenskjold, 
  Sveuska 
  Exped. 
  till 
  Magollanslanderna, 
  Bd. 
  1, 
  No. 
  

   2, 
  1898, 
  p. 
  19 
  and 
  2.i, 
  24; 
  P. 
  Dusen, 
  ibid., 
  Xo. 
  4 
  (Ueber 
  die 
  tertiaere 
  Flora 
  der 
  

   Magellanslaender, 
  1899, 
  p. 
  4). 
  

  

  