﻿i8o 
  Geological 
  Survey 
  of 
  Louisiana 
  [Sect. 
  

  

  The 
  gravel 
  sometimes 
  reaches 
  the 
  size 
  of 
  a 
  goose 
  

   egg. 
  White 
  chert 
  and 
  quartz 
  pebbles 
  are 
  com- 
  

   mon. 
  The 
  gravel 
  is 
  largest 
  at 
  the 
  top 
  and 
  

   gradually 
  grows 
  finer 
  until 
  at 
  the 
  base 
  of 
  the 
  

   strata 
  it 
  grades 
  into 
  a 
  fine 
  white 
  sand 
  20-40 
  ft. 
  

  

  4. 
  Soft 
  gray 
  sandy 
  clay 
  containing 
  vegetable 
  remains 
  

  

  and 
  occasional 
  shells 
  8-16 
  ft. 
  

  

  5. 
  Fine 
  white 
  sand 
  0-40 
  ft. 
  

  

  6. 
  Hard 
  tenaceous 
  blue 
  clay, 
  called 
  " 
  rubber 
  clay 
  " 
  

  

  containing 
  scattered 
  iron 
  concretions 
  about 
  the 
  

  

  size 
  of 
  a 
  pea 
  40-132 
  ft. 
  

  

  7. 
  Indurate 
  red 
  sand, 
  water 
  bearing. 
  Furnishes 
  an 
  

  

  abundance 
  of 
  soft 
  water. 
  . 
  

  

  Water 
  from 
  this 
  stratum 
  generally 
  rises 
  to 
  with- 
  

   in 
  ten 
  feet 
  of 
  the 
  surface. 
  

   None 
  of 
  these 
  deep 
  wells 
  were 
  personally 
  examined 
  nor 
  was 
  I 
  

   able 
  to 
  obtain 
  any 
  shells 
  from 
  layer 
  4. 
  It 
  can 
  hardly 
  be 
  doubted, 
  

   from 
  the 
  general 
  character 
  of 
  the 
  material, 
  that 
  the 
  water 
  is 
  

   from 
  the 
  older 
  Tertiary 
  strata. 
  The 
  presence 
  of 
  large 
  gravel 
  beds 
  

   in 
  the 
  river 
  valley 
  is 
  also 
  to 
  be 
  specially 
  noticed 
  for 
  no 
  gravels 
  of 
  

   northern 
  origin 
  have 
  yet 
  been 
  found 
  on 
  the 
  hills 
  west 
  of 
  the 
  

   Black 
  bayou 
  and 
  Bayou 
  Dauchite 
  gravel 
  trains. 
  

  

  JVell 
  at 
  Lotus 
  Layiding, 
  Robson 
  P. 
  O. 
  — 
  At 
  the 
  time 
  of 
  the 
  

   writer's 
  visit 
  Mr. 
  Pullin 
  had 
  just 
  finished 
  a 
  well 
  on 
  the 
  place 
  of 
  

   Capt. 
  Robson 
  at 
  Lotus 
  Landing, 
  in 
  16 
  N., 
  12 
  W. 
  from 
  which 
  he 
  

   had 
  a 
  large 
  suite 
  of 
  gravel 
  specimens. 
  

  

  JVell. 
  Section 
  on 
  Capt. 
  Robson's 
  Plantation 
  {16 
  N. 
  12 
  W.). 
  

  

  Thickness 
  

  

  Red 
  sandy 
  loam 
  4 
  ft. 
  o 
  in. 
  

  

  Fine 
  red 
  clay 
  with 
  sand 
  75 
  ft. 
  o 
  in. 
  

  

  Red 
  sand, 
  water 
  bearing 
  3 
  ft. 
  o 
  in. 
  

  

  Gravel 
  and 
  sand, 
  same 
  as 
  3 
  in 
  fore- 
  

   going 
  section 
  24 
  ft. 
  o 
  in. 
  

  

  Organic 
  clay 
  with 
  shells 
  12 
  ft. 
  o 
  in. 
  

  

  Brown 
  lignite 
  3 
  ft. 
  o 
  in. 
  

  

  Good 
  black 
  lignite 
  2 
  ft. 
  o 
  in. 
  

  

  "Soapstone," 
  soft 
  white 
  friable 
  clay. 
  7 
  ft. 
  o 
  in. 
  

   Very 
  hard 
  blue 
  limestone 
  o 
  ft. 
  8 
  in. 
  

  

  