﻿m] 
  Shreveport 
  Area: 
  Physiography 
  i8i 
  

  

  10. 
  131-135 
  Hard 
  black 
  lignite 
  4 
  ft. 
  3 
  in. 
  

  

  11. 
  135-225 
  Blue 
  cla)^ 
  90 
  ft. 
  o 
  in. 
  

  

  12. 
  225- 
  Water 
  in 
  sand, 
  not 
  passed 
  through. 
  

  

  Any 
  separation 
  of 
  this 
  section 
  in 
  beds 
  of 
  different 
  ages 
  must 
  

   be 
  necessarily 
  a 
  mere 
  guess. 
  It 
  will 
  be 
  quite 
  necessary 
  to 
  have 
  

   good 
  samples 
  from 
  each 
  of 
  the 
  different 
  layers 
  in 
  order 
  to 
  arrive 
  

   at 
  even 
  a 
  partially 
  satisfactory 
  conclusion. 
  The 
  section 
  is, 
  

   however, 
  quite 
  suggestive. 
  Layers 
  2 
  and 
  3 
  may 
  represent 
  the 
  

   Port 
  Hudson 
  of 
  Hilgard. 
  Layer 
  4 
  suggests 
  the 
  Lafayette 
  or 
  

   Orange 
  sand, 
  whatever 
  that 
  name 
  may 
  really 
  mean, 
  and 
  the 
  

   lowest 
  part 
  seems 
  to 
  be 
  older 
  Kocene 
  Tertiary. 
  

  

  Physiography 
  of 
  the 
  Bottoms 
  

   Waterfai,i,s 
  and 
  Rapids 
  

  

  Description. 
  — 
  It 
  is 
  a 
  decidedly 
  interesting 
  thing 
  to 
  find 
  in 
  the 
  

   midst 
  of 
  an 
  old, 
  well 
  developed, 
  river 
  flood-plain, 
  waterfalls 
  and 
  

   rapids. 
  Several 
  were 
  seen 
  in 
  upper 
  Caddo 
  bottoms 
  and 
  there 
  

   are 
  doubtless 
  others 
  in 
  localities 
  which 
  have 
  not 
  been 
  examined. 
  

  

  The 
  most 
  perfect 
  waterfall 
  seen 
  was 
  at 
  the 
  outlet 
  of 
  Silver 
  

   lake 
  just 
  below 
  Coushatta 
  bluffs. 
  The 
  waterfall 
  is 
  about 
  ten 
  

   feet 
  high 
  and 
  is 
  at 
  the 
  head 
  of 
  a 
  little 
  gorge 
  probably 
  300 
  yards 
  

   from 
  the 
  river. 
  The 
  crest 
  of 
  the 
  waterfall 
  is 
  composed 
  of 
  hard 
  

   bluish-gray 
  and 
  red 
  sandy 
  clays. 
  

  

  Collins 
  describes 
  a 
  waterfall 
  formed 
  by 
  the 
  water 
  flowing 
  over 
  

   a 
  hard 
  clay 
  layer 
  underlaid 
  by 
  sand, 
  in 
  a 
  channel 
  accross 
  the 
  old 
  

   Hamilton 
  fields 
  from 
  Dooley's 
  bayou 
  to 
  Old 
  Red 
  bayou.* 
  There 
  

   are 
  also 
  rapids 
  in 
  the 
  main 
  Dooley's 
  bayou 
  channel, 
  about 
  a 
  

   mile 
  above 
  its 
  entrance 
  to 
  Old 
  Red 
  bayou 
  where 
  the 
  water 
  flows 
  

   over 
  a 
  layer 
  of 
  hard 
  clay. 
  This 
  is 
  sometimes 
  called 
  " 
  Dooley's 
  

   Falls." 
  

  

  We 
  have 
  before 
  spoken 
  of 
  the 
  rapid 
  current 
  at 
  Big 
  

   Willow 
  pass 
  and 
  the 
  rapids 
  and 
  small 
  waterfall 
  at 
  Albany 
  flats. 
  

   These 
  are, 
  of 
  course, 
  not 
  noticeable 
  in 
  very 
  high 
  water 
  when 
  the 
  

   inequality 
  is 
  not 
  enough 
  to 
  effect 
  the 
  large 
  volume 
  of 
  water 
  

   greatly 
  but 
  in 
  moderate 
  stages 
  they 
  are 
  very 
  marked. 
  

  

  *43d 
  Cong. 
  1st 
  Sess., 
  House 
  Ex. 
  Doc, 
  vol. 
  2, 
  part 
  2, 
  p. 
  658. 
  

  

  