﻿HI] 
  Shreveport 
  Area: 
  Uplands 
  189 
  

  

  Notes 
  on 
  the 
  Geology 
  of 
  the 
  Hill-lands 
  * 
  

   The 
  Upland 
  Flats 
  + 
  

  

  General 
  characters. 
  — 
  The 
  point 
  of 
  land 
  between 
  Ferry 
  lake, 
  Clear 
  

   lake, 
  James 
  bayou 
  and 
  the 
  dotted 
  line 
  on 
  plate 
  16 
  shows 
  a 
  marked 
  

   topographical 
  difference 
  from 
  the 
  land 
  north 
  of 
  it 
  and 
  from 
  the 
  

   land 
  on 
  the 
  south 
  side 
  of 
  Ferry 
  lake. 
  The 
  country 
  in 
  the 
  last 
  

   two 
  mentioned 
  localities 
  is 
  hillj' 
  and 
  has 
  fairly 
  mature 
  stream 
  

   valleys. 
  The 
  area 
  under 
  discussion, 
  although 
  from 
  30 
  to 
  40 
  feet 
  

   above 
  the 
  adjacent 
  drainage 
  systems, 
  has 
  no 
  well 
  developed 
  

   stream 
  valleys. 
  The 
  water 
  finding 
  no 
  outlet 
  forms 
  little 
  swamps 
  

   between 
  the 
  little 
  mounds 
  or 
  hillocks 
  with 
  which 
  the 
  country 
  is 
  

   covered. 
  These 
  mounds 
  are 
  nearly 
  circular 
  and 
  range 
  from 
  20 
  

   to 
  80 
  feet 
  in 
  diameter 
  and 
  are 
  from 
  2 
  to 
  6 
  feet 
  in 
  height. 
  The 
  

   composition 
  of 
  these 
  mounds 
  is 
  quite 
  different 
  from 
  that 
  of 
  the 
  

   intermound 
  spaces, 
  being 
  a 
  moderately 
  fertile 
  sandy 
  loam, 
  while 
  

   that 
  between 
  them 
  is 
  a 
  poor 
  stiff 
  gray 
  or 
  yellowish 
  gray 
  

   clay, 
  commonly 
  called 
  ' 
  ' 
  post-oak 
  clay. 
  ' 
  ' 
  The 
  intermound 
  spaces 
  

   are 
  filled 
  with 
  water 
  , 
  forming 
  little 
  puddles 
  and 
  supporting 
  a 
  growth 
  

   of 
  swamp 
  or 
  pin-oak 
  and 
  post 
  -oak. 
  The 
  mounds 
  are 
  covered 
  

   with 
  post-oak 
  and 
  short 
  leaved 
  pine. 
  Under 
  the 
  ' 
  ' 
  post-oak 
  clay' 
  ' 
  

   at 
  depths 
  varying 
  from 
  a 
  few 
  inches 
  to 
  several 
  feet, 
  is 
  a 
  hard 
  red 
  

   clay. 
  This 
  is 
  exposed 
  only 
  in 
  the 
  occasional 
  gullies. 
  

  

  The 
  distribution 
  of 
  these 
  upland 
  flats 
  is 
  quite 
  extensive 
  in 
  this 
  

   part 
  of 
  Louisiana. 
  They 
  are 
  well 
  developed 
  just 
  north 
  of 
  Wal- 
  

   lace 
  lake. 
  In 
  Bossier 
  parish 
  they 
  occupy 
  a 
  strip 
  of 
  land 
  between 
  

   Carolina 
  bluffs 
  and 
  Bodcau 
  lake 
  and 
  east 
  of 
  bayou 
  Bodcau 
  they 
  

   extend 
  almost 
  to 
  Fillmore. 
  The 
  great 
  level 
  land 
  between 
  bayou 
  

   Bodcau 
  and 
  bayou 
  Dauchite 
  in 
  northern 
  Webster, 
  may 
  belong 
  to 
  

   the 
  same 
  class. 
  There 
  seems 
  to 
  be 
  a 
  great 
  piece 
  of 
  very 
  flat 
  

   uplands, 
  younger 
  than 
  the 
  Eocene, 
  lying 
  between 
  bayou 
  Bodcau 
  

   and 
  Red 
  river 
  in 
  northern 
  Louisiana 
  and 
  southern 
  Arkansas. 
  

   In 
  this 
  upland 
  flat 
  there 
  are 
  two 
  island-like 
  masses 
  of 
  Lower 
  

  

  * 
  As 
  the 
  main 
  part 
  of 
  the 
  work 
  was 
  in 
  the 
  bottoms, 
  only 
  occasional 
  oppor- 
  

   tunities 
  presented 
  themselves 
  for 
  examining 
  the 
  hill-lands. 
  

  

  fLerch, 
  Bull. 
  La. 
  vState 
  Exp. 
  Stations, 
  Geology 
  and 
  Agr., 
  Part 
  2, 
  1893, 
  

   p. 
  106. 
  

  

  