﻿62 
  GKOI.OGICAL 
  Survey 
  of 
  IvOuisiana 
  [Sect. 
  

  

  show 
  a 
  tendency 
  to 
  the 
  white 
  and 
  blue 
  banded 
  structure 
  so 
  

   characteristic 
  of 
  the 
  Winnfield 
  layers. 
  

  

  Were 
  it 
  not 
  for 
  the 
  excessive 
  dip 
  of 
  these 
  localities, 
  carrying 
  

   the 
  beds 
  below 
  at 
  a 
  rapid 
  rate, 
  this 
  limestone 
  would 
  doubtless 
  be 
  

   quarried 
  extensively. 
  

  

  The 
  Five 
  Islands. 
  — 
  For 
  information 
  concerning 
  the 
  supposed 
  

   Cretaceous 
  layers 
  in 
  these 
  islands, 
  see 
  special 
  paper 
  devoted 
  to 
  

   their 
  geology. 
  

  

  Calcasieu 
  Well 
  Section. 
  — 
  As 
  already 
  shown 
  on 
  p. 
  25, 
  the 
  crys- 
  

   talline 
  limestone, 
  sulphur 
  and 
  gypsum 
  beds 
  in 
  the 
  Louisiana 
  Oil 
  

   Co.'s 
  well 
  on 
  the 
  west 
  fork 
  of 
  Calcasieu 
  river 
  have 
  been 
  referred 
  

   to 
  the 
  Cretaceous 
  series. 
  (See 
  special 
  topic 
  Sulphur.) 
  

  

  C0NC1.US10NS 
  

  

  Much 
  has 
  been 
  said 
  in 
  geological 
  reports 
  on 
  the 
  State 
  of 
  

   Louisiana 
  about 
  the 
  Cretaceous 
  "backbone" 
  which 
  extends 
  in 
  a 
  

   ridge 
  northwest 
  of 
  the 
  Five 
  Islands 
  to 
  the 
  Salines 
  of 
  Bienville 
  

   parish. 
  

  

  This 
  Cretaceous 
  ridge 
  was 
  supposed 
  to 
  connect 
  onto 
  a 
  fictitious 
  

   southern 
  deflection 
  of 
  the 
  same 
  series 
  in 
  Arkansas 
  as 
  laid 
  down 
  

   on 
  Marcou's 
  geological 
  map 
  of 
  the 
  United 
  States. 
  

  

  Our 
  observations 
  go 
  to 
  show 
  that 
  whatever 
  folding 
  and 
  faulting 
  

   has 
  been 
  the 
  cause 
  of 
  bringing 
  the 
  underlying 
  Cretaceous 
  strata 
  

   to 
  day, 
  has 
  been 
  in 
  the 
  northeast-southwest 
  direction, 
  roughly 
  

   parallel 
  in 
  fact 
  to 
  the 
  northwestern 
  shore 
  line 
  of 
  the 
  old 
  Missis- 
  

   sippi 
  embayment 
  in 
  Eocene 
  Tertiary 
  time. 
  

  

  The 
  shallow 
  depth 
  at 
  which 
  rocks 
  supposed 
  to 
  be 
  of 
  this 
  series 
  

   have 
  been 
  struck 
  in 
  the 
  Calcasieu 
  wells 
  (380 
  ft.); 
  the 
  salines 
  at 
  the 
  

   mouth 
  of 
  Bayou 
  Negreet 
  and 
  to 
  the 
  north 
  ; 
  the 
  Midway 
  beds 
  a 
  

   few 
  miles 
  to 
  the 
  northeast 
  of 
  Many 
  ; 
  the 
  great 
  depth 
  of 
  the 
  

   Shreveport 
  well 
  (1,100 
  ft.) 
  with 
  no 
  record 
  of 
  Midway 
  or 
  Creta- 
  

   ceous 
  limestones 
  though 
  nearly 
  in 
  line 
  with 
  the 
  so-called 
  axis 
  or 
  

   ' 
  ' 
  back-bone 
  ' 
  ' 
  ; 
  the 
  various 
  dips 
  observed 
  in 
  the 
  limestones 
  at 
  

   various 
  exposures 
  with 
  but 
  one 
  exception 
  — 
  the 
  St. 
  Landry 
  out- 
  

   crops 
  — 
  all 
  indicate 
  northeast-southwest 
  local 
  folds 
  parallel 
  

   to 
  old 
  shore 
  lines 
  rather 
  than 
  a 
  mountain 
  chain 
  at 
  right 
  angles 
  

   to 
  the 
  same, 
  or 
  in 
  a 
  northwest-southeast 
  direction. 
  

  

  