﻿6o 
  Geological 
  Survey 
  of 
  Louisiana 
  [Sect. 
  

  

  greatly 
  marred 
  by 
  the 
  nodules 
  of 
  pyrite 
  scattered 
  throughout 
  its 
  

   mass, 
  causing 
  streaks 
  and 
  blotches 
  of 
  iron 
  oxide 
  over 
  its 
  exposed 
  

   surfaces. 
  Its 
  quantity 
  is 
  doubtless 
  sufficient 
  for 
  any 
  demand 
  

   that 
  is 
  liable 
  to 
  be 
  made 
  on 
  such 
  material 
  for 
  many 
  years 
  to 
  

   come. 
  

  

  The 
  peculiarity 
  of 
  this 
  limestone 
  outcrop 
  in 
  the 
  midst 
  of 
  Ter- 
  

   tiary 
  sands 
  and 
  clays 
  has 
  naturally 
  aroused 
  local 
  curiosity. 
  The 
  

   glittering 
  appearance 
  of 
  the 
  freshly 
  broken 
  pyrite 
  nodules 
  has 
  

   doubtless 
  been 
  at 
  the 
  bottom 
  of 
  the 
  vast 
  majority 
  of 
  statements 
  

   made 
  concerning 
  the 
  mineral 
  wealth 
  of 
  this 
  region. 
  Vaughan* 
  

   has 
  made 
  the 
  following 
  pointed 
  statement 
  regarding 
  this 
  exposure: 
  

   "On 
  sections 
  31 
  and 
  32, 
  T. 
  loN., 
  R. 
  4W., 
  near 
  Atlanta 
  in 
  Winn 
  

   parish, 
  there 
  outcrops 
  a 
  hard, 
  blue 
  limestone, 
  which 
  is 
  traversed 
  

   by 
  minute 
  fissures. 
  In 
  these 
  fissures 
  a 
  small 
  amount 
  of 
  gold 
  is 
  

   found." 
  

  

  This 
  must 
  have 
  been 
  a 
  near 
  shore 
  deposit, 
  for 
  it 
  contains 
  the 
  

   impressions 
  of 
  dicotyledonous 
  leaves, 
  reminding 
  one 
  somewhat 
  

   of 
  the 
  Dakota 
  sandstone. 
  The 
  age 
  of 
  the 
  limestone 
  is 
  not 
  known 
  

   to 
  a 
  certainty. 
  As 
  pointed 
  out 
  above 
  it 
  is 
  quite 
  different 
  in 
  

   lithological 
  character 
  from 
  the 
  Winnfield 
  marble 
  ; 
  but 
  since 
  the 
  

   present 
  position 
  of 
  the 
  outcrop 
  is 
  due 
  to 
  a 
  similar, 
  if 
  not 
  the 
  

   same 
  orographic 
  movement 
  that 
  brought 
  up 
  the 
  Winnfield 
  beds 
  ; 
  

   in 
  fact, 
  both 
  seem 
  to 
  be 
  on 
  the 
  same 
  line 
  of 
  weakness, 
  N. 
  E., 
  

   S. 
  W., 
  we 
  are 
  led 
  to 
  regard 
  all 
  as 
  of 
  Cretaceous 
  ages 
  as 
  else- 
  

   where 
  explained. 
  

  

  Coochie 
  brake 
  seemingly 
  owes 
  its 
  origin 
  to 
  the 
  same 
  disloca- 
  

   tion 
  of 
  the 
  strata 
  that 
  brought 
  up 
  these 
  limestone 
  beds 
  from 
  

   below. 
  It 
  appears 
  to 
  rest 
  upon 
  the 
  down-throw 
  side 
  of 
  the 
  

   fault-line 
  that 
  fractured 
  these 
  dome-like 
  structures 
  along 
  their 
  

   major 
  axes. 
  In 
  case 
  the 
  weather 
  were 
  wet, 
  a 
  pond 
  of 
  water, 
  

   very 
  analogously 
  located 
  would 
  be 
  formed 
  along 
  the 
  south 
  side 
  

   of 
  the 
  Winnfield 
  outcrops, 
  where 
  in 
  dr^^ 
  seasons 
  only 
  a 
  stream 
  

   is 
  formed 
  which 
  has 
  subterranean 
  connections 
  with 
  Bayou 
  

   Sonnel. 
  

  

  The 
  origin 
  of 
  Coochie 
  brake 
  or 
  Coochie 
  lake 
  as 
  it 
  is 
  sometimes 
  

   called, 
  has 
  little 
  in 
  common 
  with 
  the 
  origin 
  of 
  the 
  larger 
  lakes 
  

   found 
  close 
  along 
  the 
  Red 
  river 
  channel. 
  This 
  lake 
  is 
  but 
  a 
  few 
  

  

  * 
  U. 
  S. 
  Geol. 
  Survey, 
  Bull. 
  142, 
  p. 
  12, 
  1896. 
  

  

  