﻿Ill] 
  Shreveport 
  Area 
  : 
  Geology 
  175 
  

  

  Geology 
  of 
  the 
  Bottoms. 
  

   Formations 
  Represented. 
  

  

  Recent 
  beds. 
  — 
  The 
  recent 
  Red 
  river 
  deposits 
  cover 
  the 
  greater 
  

   part 
  of 
  the 
  area 
  and 
  consist 
  of 
  all 
  gradations 
  from 
  a 
  light 
  red 
  

   sandy 
  loam 
  to 
  a 
  stiff, 
  dark 
  red 
  clay. 
  In 
  places 
  it 
  exists 
  as 
  a 
  mere 
  

   veneer 
  over 
  the 
  presumably 
  older 
  deposits 
  ; 
  in 
  others 
  it 
  covers 
  

   it 
  to 
  great 
  depths. 
  

  

  Older 
  beds. 
  — 
  Outcropping 
  here 
  and 
  there 
  through 
  the 
  bottoms 
  

   and 
  exhibited 
  in 
  places 
  along 
  the 
  river 
  banks 
  are 
  beds 
  of 
  blue 
  

   clay 
  markedly 
  different 
  from 
  the 
  river 
  deposits 
  formed 
  under 
  the 
  

   present 
  regime. 
  Its 
  altitude 
  varies 
  greatly, 
  indicating 
  consider- 
  

   able 
  erosion. 
  

  

  The 
  blue 
  clay 
  outcrops 
  in 
  several 
  places 
  at 
  Dooley's 
  bayou, 
  in 
  

   the 
  bottom 
  of 
  Willow 
  pass 
  and 
  Albany 
  fiats. 
  At 
  the 
  last 
  two 
  

   places, 
  the 
  blue 
  clay 
  seems 
  to 
  be 
  simply 
  a 
  weathered 
  continua- 
  

   tion 
  of 
  the 
  dark 
  gray 
  Eocene 
  clays 
  of 
  the 
  adjoining 
  bank. 
  

  

  On 
  the 
  west 
  bank 
  of 
  the 
  river 
  in 
  the 
  S. 
  W. 
  %. 
  of 
  the 
  N. 
  E. 
  % 
  

   of 
  Sec. 
  3, 
  19 
  N., 
  14 
  W., 
  there 
  is 
  a 
  limited 
  exposure 
  of 
  the 
  older 
  

   clays. 
  On 
  the 
  opposite 
  side 
  of 
  the 
  river 
  only 
  the 
  recent 
  reddish 
  

   sandy 
  loam 
  was 
  seen 
  ; 
  about 
  200 
  yards 
  above 
  the 
  point 
  where 
  

   the 
  section 
  was 
  taken 
  only 
  the 
  most 
  recent 
  deposition 
  filled 
  with 
  

   logs 
  of 
  the 
  raft, 
  occurs. 
  

  

  The 
  section 
  here 
  exposed 
  is 
  : 
  

  

  Section, 
  Red 
  River 
  Bank, 
  James 
  Eric 
  Place 
  {Sec. 
  j, 
  19 
  N., 
  14 
  W). 
  

   3. 
  Light 
  reddish 
  yellow 
  sandy 
  loam 
  containing 
  numerous 
  

  

  specimens 
  of 
  Helix; 
  grading 
  above 
  into 
  surface 
  loam, 
  10 
  ft. 
  

   2. 
  Dark 
  bluish 
  black, 
  crumbly 
  clay 
  grading 
  below 
  into 
  red 
  

  

  sandy 
  clay 
  6 
  ft. 
  

  

  I. 
  Jointed 
  clay 
  containing 
  numerous 
  irregularly 
  shaped 
  

  

  calcareous 
  concretions. 
  Blue 
  above, 
  mottled 
  with 
  red 
  

  

  below 
  'jYzit. 
  

  

  The 
  two 
  lower 
  strata 
  seem 
  to 
  be 
  in 
  part 
  represented 
  in 
  the 
  

   Caddo 
  prairie 
  section, 
  though 
  that 
  section 
  contains 
  more 
  sand. 
  

   In 
  the 
  southern 
  part 
  of 
  Caddo 
  prairie 
  the 
  older 
  beds 
  are 
  repre- 
  

   sented 
  by 
  beds 
  of 
  poor 
  yellow 
  and 
  red 
  clayey 
  sand, 
  very 
  different 
  

   from 
  the 
  sandy 
  front 
  lands 
  of 
  the 
  river 
  but 
  similar 
  to 
  the 
  sands 
  

  

  