﻿TH 
  E 
  

  

  AMERICAN 
  JOURNAL 
  OF 
  SCIENCE 
  

  

  [FOURTH 
  SERIES.] 
  

  

  Art. 
  YIII. 
  — 
  Sedimentary 
  Rocks 
  of 
  Southern 
  Patagonia 
  ; 
  by 
  

   J. 
  B. 
  Hatcher. 
  With 
  Plate 
  I. 
  

  

  Since 
  publishing 
  my 
  last 
  paper 
  on 
  the 
  geology 
  of 
  southern 
  

   Patagonia,* 
  I 
  have 
  spent 
  two 
  years 
  in 
  that 
  region 
  making 
  a 
  

   further 
  study 
  of 
  its 
  geology 
  and 
  bringing 
  together 
  impor- 
  

   tant 
  additions 
  to 
  our 
  collections 
  of 
  fossil 
  vertebrates 
  and 
  inver- 
  

   tebrates. 
  The 
  results 
  of 
  these 
  two 
  additional 
  years 
  of 
  field 
  

   work, 
  together 
  with 
  the 
  more 
  advanced 
  stage 
  now 
  attained 
  in 
  

   the 
  study 
  of 
  our 
  collections 
  of 
  fossils, 
  have 
  greatly 
  augmented 
  

   the 
  observations 
  made 
  during 
  my 
  first 
  expedition 
  and 
  mate- 
  

   rially 
  modified 
  several 
  of 
  the 
  opinions 
  expressed 
  in 
  my 
  former 
  

   paper 
  regarding 
  the 
  age 
  and 
  relations 
  of 
  the 
  various 
  sedi- 
  

   mentary 
  deposits 
  of 
  Patagonia. 
  

  

  Chief 
  among 
  the 
  additional 
  observations 
  and 
  resultant 
  modi- 
  

   fications 
  of 
  the 
  former 
  views 
  as 
  expressed 
  in 
  my 
  first 
  paper 
  

   may 
  be 
  mentioned 
  : 
  First, 
  the 
  discovery 
  near 
  Sandy 
  Point, 
  

   in 
  the 
  Strait 
  of 
  Magellan, 
  of 
  an 
  entirely 
  new 
  series 
  of 
  Ter- 
  

   tiary 
  deposits 
  several 
  hundred 
  feet 
  thick 
  and 
  underlying 
  the 
  

   Patagonian 
  led*. 
  These 
  new 
  Tertiary 
  deposits 
  have 
  already 
  

   been 
  noticed 
  by 
  Dr. 
  A. 
  E. 
  Ortmann 
  and 
  have 
  been 
  named 
  by 
  

   him 
  the 
  2fagellanian 
  beds.-f 
  Second, 
  the 
  discovery 
  near 
  Lake 
  

   Pueyrredon 
  of 
  several 
  distinct 
  fossil-bearing 
  horizons 
  in 
  the 
  

   Cretaceous. 
  

  

  Chief 
  among 
  the 
  changes 
  which 
  it 
  now 
  seems 
  necessary 
  to 
  

   make 
  regarding 
  the 
  geologic 
  position 
  and 
  relations 
  of 
  the 
  vari- 
  

  

  *See 
  this 
  Journal, 
  vol. 
  iv, 
  pp. 
  327-354. 
  

  

  f 
  See 
  this 
  Journal, 
  vol. 
  vi, 
  1898, 
  pp. 
  478-482, 
  and 
  vol. 
  viii, 
  pp. 
  427-432. 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Fourth 
  Series, 
  Tol. 
  IX, 
  No. 
  50. 
  — 
  February, 
  1900. 
  

   7 
  

  

  