﻿214 
  Geological 
  Survey 
  of 
  Louisiana 
  [Sect. 
  

  

  circumference, 
  240 
  feet 
  high, 
  and 
  situated 
  a 
  few 
  miles 
  west 
  of 
  the 
  

   mouth 
  of 
  the 
  " 
  Chafalia 
  " 
  river. 
  

  

  Darby. 
  — 
  During 
  or 
  about 
  1817 
  William 
  Darby 
  visited 
  Petite 
  

   Anse. 
  This 
  is, 
  to 
  the 
  best 
  of 
  our 
  knowledge, 
  the 
  first 
  visit 
  of 
  a 
  

   man 
  of 
  scientific 
  attainments 
  to 
  a.ny 
  of 
  the 
  islands. 
  He 
  was 
  a 
  

   man 
  of 
  keen 
  insight 
  and 
  may 
  justly 
  be 
  regarded 
  as 
  the 
  first 
  to 
  

   make 
  geological 
  observations 
  of 
  importance 
  in 
  I,ouisiana 
  . 
  Darby 
  

   noticed 
  the 
  marked 
  difference 
  between 
  the 
  flora 
  of 
  the 
  island 
  and 
  

   that 
  of 
  the 
  surrounding 
  marshes 
  and 
  prairie. 
  The 
  flora 
  he 
  

   regarded 
  as 
  the 
  .same 
  as 
  that 
  on 
  the 
  Opelousas 
  hills 
  and 
  the 
  hills 
  

   further 
  north. 
  He 
  pointed 
  out 
  the 
  likeness 
  of 
  the 
  salt 
  spring, 
  dis- 
  

   covered 
  several 
  years 
  before 
  his 
  vi.sit, 
  to 
  the 
  salt 
  springs 
  of 
  

   Louisiana 
  north 
  of 
  Red 
  river.* 
  This 
  point 
  was 
  not 
  again 
  

   noticed 
  until 
  Hilgard's 
  third 
  Louisiana 
  article. 
  f 
  He 
  attributes 
  

   the 
  i.slands 
  to 
  a 
  source 
  other 
  than 
  the 
  "revolution 
  affected 
  by 
  

   alluvion." 
  % 
  

  

  Thomassy 
  s 
  first 
  visit. 
  — 
  Thomassy's 
  first 
  visit 
  to 
  Petite 
  Anse 
  

   was 
  made 
  in 
  i857.§ 
  Between 
  that 
  time 
  and 
  1859 
  he 
  visited 
  all 
  

   the 
  islands 
  but 
  Belle 
  Isle. 
  He 
  speaks 
  of 
  the 
  salt 
  springs 
  on 
  Petite 
  

   Anse 
  and 
  traces 
  their 
  origin 
  to 
  masses 
  of 
  rock 
  salt 
  " 
  scattered 
  

   through 
  the 
  strata." 
  He 
  regards 
  the 
  Five 
  islands 
  and 
  the 
  hills 
  

   along 
  the 
  Bayou 
  Teche, 
  Boeuf 
  and 
  beyond 
  the 
  Red 
  river 
  as 
  the 
  

   products 
  of 
  sort 
  of 
  mud, 
  water 
  and 
  gas 
  volcanoes 
  ; 
  in 
  a 
  word 
  they 
  

   are 
  gigantic 
  mud-lumps. 
  They 
  are 
  not 
  of 
  the 
  same 
  age, 
  C6te 
  

   Blanche 
  being 
  the 
  oldest 
  and 
  the 
  Cote 
  Gelee, 
  Opelousas 
  and 
  

   Avoylles 
  hills 
  the 
  most 
  recent. 
  They 
  have 
  probably 
  been 
  form- 
  

   ing 
  since 
  the 
  middle 
  of 
  the 
  Quaternary. 
  || 
  

  

  *The 
  Emigrant's 
  Guide 
  to 
  the 
  Western 
  and 
  Southern 
  States 
  of 
  Louisiana, 
  

   Mississippi, 
  Tennessee, 
  Kentucky, 
  Ohio, 
  etc. 
  With 
  map. 
  By 
  Wm. 
  Darby 
  ; 
  

   New 
  York, 
  1818, 
  p. 
  86. 
  

  

  f 
  Summar}' 
  of 
  Results 
  of 
  a 
  Late 
  Geological 
  Reconnaissance 
  of 
  Louisiana, 
  

   by 
  E. 
  W. 
  Hilgard. 
  Am. 
  Jour. 
  Sci.. 
  2d 
  Ser., 
  vol. 
  48, 
  p. 
  342, 
  1869. 
  

  

  % 
  A 
  Geographical 
  Description 
  of 
  Louisiana 
  by 
  William 
  Darby, 
  1816, 
  p. 
  48. 
  

  

  § 
  Supplement 
  a 
  la 
  Geologic 
  Pratique 
  de 
  la 
  Louisiana. 
  He 
  Petite 
  Anse. 
  

   Geol. 
  Soc. 
  France, 
  Bull., 
  2d 
  Series, 
  vol. 
  20, 
  1863, 
  p. 
  542. 
  

  

  II 
  Geologie 
  Pratique 
  de 
  la 
  Louisiana 
  par 
  R. 
  Thomassy. 
  New 
  Orleans, 
  

   i860, 
  Chapter 
  VIII, 
  pp. 
  72-86. 
  

  

  