﻿^ 
  Historical 
  Review 
  : 
  Second 
  Period 
  33 
  

  

  I. 
  

  

  Q. 
  

  

  C 
  

  

  L. 
  

  

  DC 
  ID 
  

  

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  5 
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  T3 
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  q: 
  

  

  

  

  ^^^^^=53=?s 
  

  

  CRETACEOUS 
  

  

  Fig. 
  I. 
  — 
  Tratisverse 
  section 
  of 
  Louisiana. 
  After 
  Hopkins. 
  

   The 
  Cretaceous 
  is 
  said 
  to 
  rise 
  to 
  the 
  surface 
  in 
  but 
  few 
  locali- 
  

   ties. 
  One 
  is 
  ou 
  Dugdamona 
  bayou, 
  S. 
  35, 
  12 
  N., 
  3 
  W. 
  

   Another 
  is 
  in 
  St. 
  Landry 
  about 
  seven 
  miles 
  west 
  of 
  Chicot. 
  

   Other 
  Cretaceous 
  rocks 
  have 
  been 
  met 
  with 
  in 
  wells, 
  around 
  

   Drake's 
  salt-works. 
  King's 
  salt-works, 
  and 
  in 
  the 
  sulphur 
  well 
  

   at 
  Calcasieu. 
  

  

  The 
  well 
  section 
  at 
  Calcasieu 
  he 
  gives 
  from 
  information 
  

   obtained 
  from 
  a 
  Mr. 
  Munu, 
  as 
  follows 
  : 
  

  

  Prairie 
  Diluvium, 
  i. 
  160 
  feet 
  blue 
  clay, 
  layers 
  of 
  sand. 
  

  

  Drift 
  2. 
  173 
  feet 
  sand. 
  

  

  Grand 
  Gulf 
  3. 
  10 
  feet 
  clay 
  rock 
  "soapstone." 
  

  

  Vicksburg 
  4. 
  40 
  feet 
  blue 
  anthraconitic, 
  limestone, 
  fissured. 
  

  

  f 
  5. 
  60 
  feet 
  gray 
  limestone. 
  

  

  I 
  6. 
  ICO 
  feet 
  pure 
  crystalline 
  sulphur. 
  

  

  Cretaceous 
  -j 
  7. 
  137 
  feet 
  gypsum, 
  with 
  sulphur. 
  

  

  I 
  8. 
  10 
  feet 
  sulphur. 
  

   [9. 
  540 
  feet 
  g3-psum, 
  grayish 
  blue. 
  

   He 
  is 
  led 
  to 
  believe 
  that 
  : 
  " 
  The 
  sulphur 
  was 
  formed 
  by 
  reduc- 
  

   ing 
  the 
  gypsum 
  with 
  vegetable 
  matter. 
  The 
  carbonic 
  acid, 
  

   defiant 
  gas 
  and 
  the 
  marsh 
  gas 
  produced 
  by 
  the 
  process, 
  have 
  

   each 
  left 
  the 
  proof 
  its 
  presence, 
  i. 
  e. 
  , 
  the 
  limestone 
  stratum 
  No. 
  

   5 
  contains 
  the 
  former, 
  the 
  petroleum 
  is 
  made 
  from 
  the 
  olefiant 
  

   gas," 
  and 
  the 
  small 
  low 
  mounds 
  of 
  that 
  and 
  other 
  regions 
  were 
  

   formed 
  by 
  the 
  escaping 
  of 
  these 
  gases. 
  

  

  The 
  Mansfield 
  group 
  is 
  discussed 
  lithologically, 
  geographically 
  

   and 
  paleontologically. 
  A 
  hundred 
  foot 
  section 
  is 
  given 
  near 
  

   Columbia. 
  Sections 
  at 
  Coal-bluff, 
  on 
  the 
  Chickasaw 
  creek, 
  and 
  

   at 
  Grande 
  Ecore, 
  on 
  Red 
  river, 
  are 
  given 
  in 
  detail, 
  with 
  others. 
  

   At 
  Spring 
  Bank, 
  in 
  Arkansas.eight 
  miles 
  above 
  the 
  State 
  line, 
  

   a 
  fine 
  exposure 
  occurs 
  containing 
  a 
  sufficiently 
  large 
  amount 
  of 
  

   iron 
  ore 
  to 
  "almost 
  justify 
  theestablishmentof 
  a 
  furnace." 
  (p. 
  89.) 
  

   C 
  

  

  