﻿Ill] 
  The 
  Fire 
  Islands: 
  Surrounding 
  County 
  257 
  

  

  Conclusions. 
  — 
  -The 
  regularity 
  of 
  the 
  surface 
  laj'-er 
  of 
  clay 
  and 
  

   the 
  underlying 
  gravel 
  beds 
  is 
  very 
  similar 
  to 
  Grande 
  Cote 
  and 
  Cote 
  

   Blanche, 
  so 
  far 
  as 
  we 
  know 
  it. 
  In 
  three 
  of 
  these 
  wells 
  there 
  is 
  

   a 
  single 
  layer 
  of 
  clay 
  which 
  might 
  show 
  something 
  about 
  the 
  dip, 
  

  

  the 
  relative 
  elevation 
  and 
  position 
  of 
  the 
  holes 
  was 
  known. 
  

   The 
  island 
  shows 
  no 
  evidence 
  whatever 
  of 
  having 
  been 
  thrown 
  

   out 
  of 
  I^ake 
  Peigneur 
  by 
  an 
  explosion 
  or 
  eruption 
  of 
  any 
  kind. 
  

   Nor 
  was 
  Lake 
  Peigneur 
  necessarily 
  formed 
  at 
  the 
  same 
  time. 
  

  

  Attakapas 
  Prairie 
  

   Wei,!. 
  Sections 
  

  

  Hilgard's 
  supposition. 
  — 
  The 
  boring 
  of 
  numerous 
  artesian 
  wells 
  

   in 
  Attakapas 
  prairie 
  has 
  thrown 
  much 
  light 
  on 
  the 
  stratigraphy' 
  

   of 
  this 
  part 
  of 
  the 
  country. 
  Hilgard, 
  from 
  a 
  superficial 
  exami- 
  

   nation 
  of 
  the 
  country 
  around 
  the 
  islands 
  states 
  that 
  nearly 
  all 
  

   the 
  material 
  above 
  the 
  Port 
  Hudson 
  stump 
  stratum 
  has 
  been 
  

   eroded 
  ; 
  indeed, 
  he 
  believed 
  that 
  the 
  present 
  relief 
  of 
  the 
  islands 
  

   was 
  to 
  a 
  very 
  great 
  extent 
  produced 
  by 
  the 
  removal, 
  by 
  erosion 
  

   of 
  the 
  Port 
  Hudson 
  material 
  from 
  the 
  country 
  surrounding 
  the 
  

   islands. 
  These 
  sections 
  rather 
  disprove 
  this 
  idea 
  as 
  they 
  show 
  

   material 
  of 
  very 
  considerable 
  thickness 
  which 
  Hilgard 
  would 
  

   undoubtedly 
  have 
  regarded 
  as 
  Port 
  Hudson. 
  

  

  Jeannerette 
  well 
  sections. 
  — 
  The 
  data 
  collected 
  by 
  Clendenin 
  

   give 
  a 
  set 
  of 
  four 
  wells 
  extending 
  from 
  Jeannerette 
  in 
  the 
  direc- 
  

   tion 
  of 
  Grande 
  Cote 
  ; 
  two 
  of 
  which 
  we 
  have 
  taken 
  the 
  liberty 
  

   of 
  reproducing. 
  

  

  Ice 
  Factory 
  Well 
  Jeannerette 
  

  

  Depth 
  Feet 
  

  

  I. 
  0-15 
  Red 
  clay 
  15 
  

  

  2- 
  i5~" 
  95 
  Mottled 
  clay 
  and 
  sand 
  80 
  

  

  3. 
  95-105 
  Organic 
  bed, 
  leaves, 
  twigs, 
  etc 
  10 
  

  

  4. 
  105-175 
  Sand 
  and 
  gravel. 
  Water 
  bearing 
  70 
  

  

  5- 
  175-350 
  Yellow 
  clay, 
  not 
  passed 
  through 
  175 
  

  

  A 
  second 
  well 
  much 
  nearer 
  Grande 
  Cote 
  shows 
  a 
  greater 
  

   thickness 
  of 
  the 
  beds 
  overlying 
  the 
  gravel. 
  

   Q 
  

  

  