﻿Ill] 
  Shreveport 
  Area 
  : 
  Uplands 
  191 
  

  

  hillsides. 
  This 
  cla}^ 
  is 
  markedly 
  different 
  from 
  the 
  red 
  clays 
  of 
  

   the 
  Tertiary 
  to 
  the 
  east. 
  The 
  concretions 
  are 
  in 
  themselves 
  very 
  

   distinctive 
  ; 
  these 
  light 
  red, 
  smooth, 
  rounded 
  claystone 
  masses 
  

   are 
  entirely 
  distinct 
  from 
  the 
  red 
  ironstone 
  concretions 
  of 
  the 
  

   old 
  Tertiary. 
  For 
  about 
  a 
  half 
  a 
  mile 
  east 
  of 
  the 
  bridge 
  the 
  clay 
  is 
  

   overlaid 
  by 
  thick 
  beds 
  of 
  red 
  silty 
  sand. 
  Red 
  Chute 
  hill, 
  where 
  

   the 
  road 
  descends 
  from 
  the 
  uplands 
  to 
  the 
  bottoms 
  is 
  about 
  50 
  

   feet 
  high 
  and 
  the 
  washed 
  road 
  cut 
  shows 
  good 
  exposures. 
  It 
  

   is 
  composed 
  entirely 
  of 
  fine 
  grained 
  red 
  sand 
  and 
  loam 
  with 
  a 
  

   little 
  red 
  clay. 
  

  

  An 
  exposure 
  of 
  these 
  sands 
  was 
  seen 
  at 
  Carolina 
  and 
  Hurricane 
  

   bluffs. 
  Carolina 
  bluffs 
  are 
  composed 
  of 
  about 
  60 
  feet 
  of 
  light 
  

   red 
  with 
  some 
  white 
  and 
  yellow, 
  cross 
  bedded-sands. 
  Lenticular 
  

   masses 
  ot 
  red 
  clay 
  are 
  scattered 
  through 
  the 
  sands. 
  In 
  the 
  

   upper 
  portion 
  of 
  the 
  hill 
  a 
  thick 
  bed 
  of 
  red 
  clay 
  is 
  overlaid, 
  for 
  a 
  

   short 
  distance, 
  by 
  a 
  bed 
  of 
  gray 
  clay 
  two 
  feet 
  thick. 
  

  

  The 
  red 
  concretionary 
  clay 
  outcrops 
  in 
  numerous 
  places 
  along 
  

   the 
  north 
  side 
  of 
  Ferry 
  lake, 
  where 
  the 
  waves 
  have 
  washed 
  out 
  

   the 
  concretions 
  and 
  formed 
  numerous 
  little 
  pebble 
  beaches. 
  It 
  

   is 
  also 
  well 
  developed 
  along 
  the 
  north 
  shore 
  of 
  Cross 
  lake, 
  while 
  

   the 
  southern 
  shore 
  shows 
  the 
  entirely 
  different 
  old 
  Tertiary 
  strata. 
  

  

  The 
  first 
  cut 
  north 
  of 
  the 
  trestle 
  over 
  Lake 
  Wallace 
  exposes 
  

   irregularly 
  bedded 
  white 
  and 
  red 
  sands 
  and 
  red 
  concretionary 
  

   clays. 
  Weathered 
  surfaces 
  show 
  a 
  red 
  glaze 
  over 
  the 
  whole 
  

   mass, 
  even 
  over 
  the 
  white 
  sands. 
  Little 
  or 
  no 
  clay 
  was 
  seen 
  in 
  

   the 
  part 
  of 
  the 
  cut 
  immediately 
  adjacent 
  to 
  the 
  lake, 
  here 
  light 
  

   colored 
  stratified 
  sands, 
  not 
  effected 
  by 
  dilute 
  hydrochloric 
  acid, 
  

   are 
  covered 
  by 
  massive 
  brick 
  red 
  sand 
  about 
  four 
  feet 
  thick. 
  

   Toward 
  the 
  northern 
  end 
  of 
  the 
  cut 
  the 
  calcareous 
  clays 
  and 
  fine 
  

   sands 
  with 
  very 
  large 
  calcareous 
  concretions 
  become 
  very 
  

   prominent. 
  

  

  The 
  first 
  cut 
  south 
  of 
  the 
  trestle 
  (on 
  the 
  other 
  side 
  of 
  the 
  

   lake) 
  consists 
  of 
  finely 
  laminated 
  gray 
  clay 
  with 
  sand 
  partings, 
  

   overlaid 
  by 
  grayish 
  yellow 
  sands 
  which 
  contain 
  lense-shaped 
  

   masses 
  of 
  clay 
  which 
  have 
  evidently 
  been 
  derived 
  from 
  the 
  under- 
  

   lying 
  clays. 
  This 
  sand 
  contains 
  numerous 
  specimens 
  of 
  silici- 
  

   fied 
  wood. 
  

  

  Age 
  of 
  the 
  upland 
  flats. 
  — 
  The 
  facts 
  at 
  hand 
  indicate 
  that 
  these 
  

  

  