﻿Ill] 
  Special 
  Report 
  No. 
  3 
  : 
  Five 
  Lslands 
  219 
  

  

  of 
  the 
  great 
  mountain 
  chain 
  made 
  of 
  fractured, 
  faulted 
  and 
  folded 
  

   strata 
  ; 
  while 
  Vaughan 
  thinks 
  that 
  they 
  owe 
  their 
  origin 
  entirely 
  

   to 
  erosion 
  in 
  pre-Eocene 
  time.^ 
  

  

  Clende7un. 
  — 
  W. 
  W. 
  Clendenin, 
  formerly 
  geologist 
  to 
  the 
  State 
  

   Experiment 
  Station, 
  visited 
  all 
  the 
  islands 
  during 
  1895. 
  He 
  

   concludes 
  that 
  the 
  foundation 
  of 
  these 
  islands 
  is 
  Cretaceous 
  and 
  

   that 
  the 
  Cretaceous 
  ridge, 
  of 
  which 
  the 
  islands 
  are 
  remnants, 
  

   owes 
  its 
  origin 
  to 
  differential 
  elevation 
  in 
  pre-Lafayette 
  time 
  ; 
  

   which 
  differential 
  elevation 
  was 
  continued 
  in 
  the 
  later 
  part 
  of 
  the 
  

   Lafayette; 
  but 
  that 
  the 
  present 
  aspect 
  of 
  the 
  islands 
  is 
  due 
  to 
  the 
  

   interruption 
  of 
  this 
  ridge 
  b}' 
  erosion, 
  which 
  began 
  immediately 
  

   after 
  the 
  initial 
  elevation 
  and 
  was 
  most 
  active 
  during 
  the 
  early 
  

   part 
  of 
  the 
  Columbia 
  period. 
  f 
  

  

  Lucas. 
  — 
  The 
  latest 
  published 
  observation 
  on 
  the 
  islands 
  are 
  by 
  

   Capt. 
  A. 
  F. 
  Eucas, 
  at 
  one 
  time 
  superintendent 
  and 
  manager 
  of 
  

   the 
  Avery 
  Mine 
  and 
  in 
  charge 
  of 
  most 
  of 
  the 
  borings 
  on 
  Cote 
  

   Carline, 
  Cote 
  Blanche 
  and 
  Belle 
  Isle. 
  He 
  gives 
  abstracts 
  of 
  the 
  

   Cote 
  Carline 
  Island 
  borings 
  \ 
  and 
  records 
  the 
  discovery 
  of 
  salt 
  on 
  

   Grande 
  C6te 
  and 
  Belle 
  Island. 
  § 
  He 
  states 
  that 
  the 
  salt 
  is 
  of 
  

   Tertiary 
  age 
  but 
  gives 
  no 
  reasons 
  for 
  believing 
  it 
  such. 
  

  

  Geographical 
  Position 
  and 
  General 
  Topographical 
  

   Features 
  of 
  the 
  Islands 
  

  

  Geographical 
  Position 
  

  

  Location. 
  — 
  Reference 
  to 
  the 
  geological 
  map 
  of 
  the 
  State 
  will 
  

   show 
  five 
  elevations 
  along 
  a 
  line 
  bearing 
  S. 
  49° 
  E. 
  and 
  running 
  

   from 
  Lake 
  Peigneur, 
  half 
  way 
  between 
  New 
  Iberia 
  and 
  Abbeville, 
  

   to 
  the 
  mouth 
  of 
  the 
  Atchafalya 
  river. 
  Only 
  one, 
  the 
  second, 
  

  

  *A 
  Brief 
  Contribution 
  to 
  the 
  Geology 
  and 
  Paleontology 
  of 
  Northwestern 
  

   Louisiana 
  by 
  T. 
  Wayland 
  Vaughan, 
  U. 
  S. 
  Geol. 
  vSurvey, 
  Bull. 
  No. 
  142, 
  p. 
  

   15. 
  1S96. 
  

  

  \ 
  A 
  Preliminary 
  Report 
  on 
  the 
  Florida 
  Parishes 
  of 
  East 
  Louisiana 
  and 
  the 
  

   BluflF, 
  Prairie 
  and 
  Hill 
  Lands 
  of 
  Southwest 
  Louisiana 
  by 
  W. 
  W. 
  Clendenin, 
  

   La., 
  State 
  Expt. 
  Station 
  Bull. 
  Geology 
  and 
  Agriculture 
  Part 
  III, 
  pp. 
  

   239-740, 
  1896. 
  

  

  X 
  The 
  Avery 
  Salt 
  Mine 
  and 
  the 
  Joseph 
  Jefferson 
  Salt 
  Deposit, 
  Louisiana 
  

   by 
  A. 
  F. 
  Lucas, 
  Eng. 
  and 
  Mining 
  Jour., 
  vol. 
  62, 
  pp. 
  463-464, 
  1896. 
  

  

  § 
  Louisiana 
  vSalt 
  Resources 
  by 
  A. 
  F. 
  Lucas. 
  Am. 
  Manuf., 
  vol. 
  63, 
  pp. 
  

   910-91 
  1, 
  1898. 
  

  

  