﻿ni] 
  Special 
  Report 
  No. 
  3 
  : 
  Five 
  Islands 
  215 
  

  

  » 
  

  

  PERIOD 
  Since 
  the 
  Discovery 
  of 
  Rock 
  Salt 
  

  

  Thomassy' 
  s 
  seco?id 
  visit. 
  — 
  Shortly 
  after 
  the 
  discovery 
  of 
  rock 
  

   salt 
  (1862) 
  on 
  Petite 
  Anse 
  he 
  again 
  visited 
  the 
  island, 
  and 
  made 
  

   a 
  more 
  thorough 
  examination 
  of 
  it. 
  On 
  this 
  visit 
  he 
  found 
  

   besides 
  the 
  original 
  "crater 
  of 
  elevation," 
  which 
  he 
  mentions 
  

   in 
  his 
  earlier 
  report, 
  three 
  others. 
  His 
  report* 
  on 
  this 
  visit 
  

   entitles 
  him 
  to 
  the 
  credit 
  of 
  having 
  been 
  the 
  first 
  to 
  bring 
  the 
  

   discovery 
  of 
  rock 
  salt 
  before 
  the 
  scientific 
  world 
  and 
  of 
  having 
  

   prepared 
  the 
  first 
  and 
  most 
  accurate 
  sketch 
  map 
  of 
  the 
  topog- 
  

   raphy 
  of 
  the 
  island. 
  

  

  011)671. 
  — 
  The 
  next 
  scientific 
  observer, 
  and 
  the 
  one 
  to 
  whom 
  

   the 
  credit 
  of 
  having 
  been 
  the 
  first 
  to 
  make 
  a 
  scientific 
  investiga- 
  

   tion 
  of 
  the 
  island 
  is 
  generally 
  given, 
  f 
  Dr. 
  Richard 
  Owen, 
  visited 
  

   the 
  island 
  in 
  November, 
  1865. 
  After 
  a 
  hasty 
  examination 
  he 
  

   showed 
  that 
  the 
  island 
  is 
  not 
  of 
  volcanic 
  origin 
  ; 
  but 
  consists 
  

   entirely 
  of 
  sedimentary 
  material. 
  t 
  The 
  island 
  he 
  considers 
  a 
  

   dune-like 
  formation 
  made 
  by 
  the 
  combined 
  action 
  of 
  the 
  wind 
  

   and 
  waves. 
  

  

  Goessmann. 
  — 
  Under 
  the 
  auspices 
  of 
  the 
  American 
  Bureau 
  of 
  

   Mines, 
  in 
  November, 
  1866, 
  Dr. 
  Chas. 
  Goessmann, 
  in 
  company 
  

   with 
  Mr. 
  C. 
  E. 
  Buck, 
  made 
  a 
  careful 
  economic 
  examination 
  of 
  

   the 
  island 
  and 
  prepared 
  a 
  sketch 
  hacheur 
  map. 
  Goessmann 
  

   supposes 
  that 
  the 
  rock 
  salt 
  deposit 
  was 
  formed 
  from 
  salt 
  springs 
  

   rather 
  than 
  sea 
  water, 
  and 
  is 
  of 
  Tertiary 
  origin. 
  § 
  

  

  Hilgard. 
  — 
  The 
  following 
  year 
  Prof. 
  Eugene 
  W. 
  Hilgard, 
  

   under 
  the 
  direction 
  of 
  the 
  Smithsonian 
  Institution, 
  visited 
  the 
  

  

  * 
  Supplement 
  a 
  la 
  Geologic 
  Pratique 
  de 
  la 
  Louisiane. 
  He 
  Petite 
  Anse 
  : 
  

   par 
  M. 
  R. 
  Thomassy. 
  Carte. 
  vSoc. 
  Geol 
  de 
  France, 
  Bull., 
  2d 
  serie, 
  tome 
  

   20, 
  pp. 
  542-544, 
  1863. 
  

  

  f 
  On 
  the 
  Geology 
  of 
  Lower 
  Louisiana 
  and 
  the 
  Rock 
  Salt 
  Deposit 
  of 
  Petite 
  

   Anse 
  (abs. 
  ). 
  Am. 
  Jour. 
  Sci., 
  2d 
  series, 
  vol. 
  47, 
  p. 
  77, 
  1869, 
  by 
  K. 
  W, 
  Hil- 
  

   gard. 
  

  

  Ibid. 
  — 
  Smithsonian 
  Contr. 
  , 
  vol. 
  23, 
  separate 
  No. 
  248, 
  p. 
  i, 
  1872. 
  

  

  X 
  On 
  the 
  Rock 
  Salt 
  at 
  New 
  Iberia, 
  Louisiana 
  by 
  Prof. 
  Richard 
  Owen, 
  

   Trans. 
  Acad. 
  Sci., 
  St. 
  Louis, 
  vol. 
  2, 
  pp. 
  250-252, 
  1868. 
  

  

  Ibid. 
  — 
  Am. 
  Jour. 
  Sci., 
  2d 
  series, 
  vol. 
  42, 
  pp. 
  120-123, 
  1868. 
  

  

  § 
  On 
  the 
  Rock 
  Salt 
  Deposit 
  of 
  the 
  Petite 
  Anse, 
  Louisiana, 
  Salt 
  Company. 
  

   Report 
  of 
  American 
  Bureau 
  of 
  Mines 
  by 
  Chas. 
  Goessmann, 
  New 
  York, 
  1867. 
  

  

  