﻿II] 
  General 
  Geology 
  : 
  Lower 
  Claiborne 
  Eocene 
  73 
  

  

  described. 
  Hilgard 
  has 
  noted 
  similar 
  beds 
  in 
  the 
  Dolet 
  hill. 
  

   In 
  fact, 
  outcrops 
  of 
  this 
  substance 
  are 
  of 
  frequent 
  occurrence 
  in 
  

   this 
  part 
  of 
  the 
  State, 
  and 
  we 
  are 
  prepared 
  to 
  reaffirm 
  Hilgard' 
  s 
  

   statement 
  "that 
  lignitic 
  strata 
  crop 
  out 
  on 
  both 
  sides 
  of 
  the 
  

   dividing 
  ridge 
  from 
  Pleasant 
  hill 
  to 
  Mansfield, 
  towards 
  Shreve- 
  

   port. 
  

  

  Various 
  estimates 
  are 
  given 
  as 
  to 
  the 
  thickness 
  and 
  character 
  

   of 
  these 
  lignite 
  beds. 
  The 
  whole 
  -subject 
  must 
  be 
  taken 
  up 
  

   systematically 
  and 
  monographed 
  in 
  some 
  future 
  annual 
  report. 
  

  

  Grand 
  Cane. 
  — 
  Going 
  north 
  from 
  Mansfield, 
  numerous 
  arena- 
  

   ceous 
  deposits 
  are 
  seen 
  along 
  the 
  roadside, 
  some 
  showing 
  flow 
  

   and 
  plunge 
  structure. 
  Post-oak 
  flats 
  with 
  mounds 
  are 
  here 
  

   extensive. 
  Red 
  iron-stone 
  concretions 
  are 
  here 
  and 
  there 
  abun- 
  

   dant. 
  Yellowish 
  concretionar}- 
  limestone 
  was 
  noticed 
  often 
  near 
  

   Grand 
  Cane. 
  

  

  Stonewall. 
  — 
  Calcareous 
  limestone 
  boulders 
  and 
  lignite 
  are 
  

   noticed 
  about 
  Stonewall. 
  The 
  soil 
  and 
  topographic 
  features 
  are 
  

   similar 
  to 
  those 
  around 
  Mansfield 
  and 
  Shreveport. 
  

  

  Shreveport. 
  — 
  (See 
  special 
  report 
  on 
  this 
  area 
  included 
  in 
  this 
  

   report.) 
  

  

  Lower 
  Claiborne 
  Stage 
  

   Prewminarv 
  Remarks 
  

  

  The 
  beds 
  that 
  belong 
  to 
  this 
  stage 
  have 
  been 
  referred 
  by 
  the 
  

   earlier 
  writers 
  on 
  Louisiana 
  geology 
  to 
  the 
  ' 
  ' 
  Vicksburg, 
  " 
  " 
  Jack- 
  

   son," 
  " 
  Mansfield," 
  groups 
  or 
  stages, 
  as 
  it 
  is 
  stated 
  in 
  our 
  His- 
  

   torical 
  review 
  (see 
  Hilgard 
  and 
  Hopkins, 
  Reconnaissance 
  Period). 
  

  

  After 
  a 
  better 
  understanding 
  of 
  the 
  inter-relationship 
  of 
  the 
  

   Eocene 
  deposits 
  east 
  of 
  the 
  Mississippi 
  was 
  worked 
  out, 
  chiefl}- 
  

   in 
  Alabama 
  by 
  Smith 
  and 
  Aldrich, 
  references 
  were 
  made 
  to 
  the 
  

   " 
  Claiborne 
  " 
  of 
  Louisiana.* 
  

  

  To 
  Hon. 
  T. 
  H. 
  Aldrich 
  of 
  Birmingham, 
  Alabama, 
  science 
  is 
  

   mainly 
  indebted 
  for 
  the 
  recognition 
  of 
  this 
  stage 
  in 
  Louisiana. 
  

   It 
  was 
  he 
  to 
  whom 
  man}- 
  of 
  the 
  fossils 
  collected 
  by 
  Johnson 
  in 
  

   1885 
  were 
  submitted. 
  

  

  With 
  his 
  aid, 
  Johnson 
  was 
  able 
  to 
  state 
  in 
  his 
  report 
  on 
  the 
  

  

  * 
  Mineral 
  Resources 
  of 
  the 
  United 
  States, 
  1883, 
  p. 
  554. 
  

  

  