﻿I] 
  HiSTORiCAi, 
  Review 
  : 
  Third 
  Period 
  39 
  

  

  Third 
  Period. 
  

   Period 
  of 
  Work 
  under 
  the 
  Direction 
  of 
  Experiment 
  Station. 
  

  

  Lerch. 
  — 
  Dr. 
  Otto 
  Lerch 
  spent 
  from 
  March 
  i 
  to 
  May 
  18, 
  1892, 
  

   in 
  the 
  study 
  of 
  the 
  geology 
  of 
  Northern 
  Louisiana. 
  His 
  report, 
  

   which 
  appeared 
  the 
  same 
  year, 
  was 
  entitled 
  "A 
  Preliminary 
  

   Report 
  upon 
  the 
  Hills 
  of 
  Louisiana, 
  north 
  of 
  Vicksburg, 
  Shreve- 
  

   port 
  and 
  Pacific 
  Railroad." 
  It 
  consisted 
  of 
  52 
  8vo. 
  pages, 
  and 
  

   was 
  illustrated 
  by 
  figures 
  in 
  the 
  text. 
  

  

  The 
  work 
  of 
  this 
  brief 
  period 
  was 
  mainly 
  confined 
  to 
  localities 
  

   along 
  the 
  line 
  of 
  the 
  V. 
  S. 
  and 
  P. 
  R. 
  R. 
  He 
  visited 
  Rayburn's 
  

   salt 
  works, 
  however, 
  and 
  was 
  the 
  first 
  to 
  note 
  Cretaceous 
  fossils 
  

   at 
  that 
  locality. 
  He 
  gives 
  a 
  good 
  description 
  of 
  the 
  old 
  works, 
  

   including 
  a 
  figure 
  showing 
  his 
  idea 
  of 
  the 
  stratigraphy 
  of 
  the 
  

   region. 
  

  

  A 
  long 
  section 
  (opp. 
  p. 
  22 
  of 
  his 
  report) 
  shows 
  his 
  conception 
  

   of 
  the 
  Eocene 
  stratigraphy 
  of 
  N, 
  Louisiana. 
  Analyses 
  of 
  seven 
  

   artesian 
  wells 
  and 
  spring- 
  waters 
  are 
  given. 
  Ten 
  soil 
  analyses 
  

   were 
  made 
  and 
  published. 
  Three 
  specimens 
  of 
  iron 
  ore 
  and 
  two 
  

   of 
  lignite 
  were 
  tested. 
  

  

  The 
  " 
  List 
  of 
  Fossils 
  from 
  the 
  Green 
  Sand 
  Marl, 
  two 
  and 
  one- 
  

   half 
  miles 
  Northeast 
  of 
  Mt. 
  Lebanon, 
  La.," 
  affords 
  we 
  

   believe, 
  the 
  first 
  satisfactory 
  published 
  proof 
  of 
  the 
  age 
  of 
  the 
  

   large 
  majority 
  of 
  the 
  marly 
  fossiliferous 
  beds 
  of 
  northwest 
  

   Louisiana, 
  

  

  Lerch 
  continued 
  field-work 
  during 
  July 
  and 
  August 
  in 
  north- 
  

   ern 
  Louisiana. 
  The 
  special 
  field 
  of 
  investigation 
  is 
  indicated 
  by 
  

   the 
  title 
  of 
  his 
  second 
  report 
  published 
  in 
  1893. 
  It 
  reads, 
  "A 
  

   Preliminary 
  Report 
  upon 
  the 
  Hills 
  of 
  Louisiana, 
  South 
  of 
  the 
  

   Vicksburg, 
  Shreveport 
  and 
  Pacific 
  Railroad, 
  to 
  Alexandria, 
  La." 
  

   His 
  former 
  publication 
  being 
  styled 
  No. 
  i, 
  this 
  follows 
  accord- 
  

   ingly 
  as 
  No. 
  2. 
  

  

  After 
  discussing 
  the 
  topography, 
  drainage 
  and 
  lakes, 
  he 
  takes 
  

   up 
  " 
  General 
  Geology 
  " 
  and 
  treats 
  the 
  various 
  formations 
  that 
  

   underlie 
  this 
  portion 
  of 
  the 
  State, 
  beginning 
  with 
  the 
  oldest, 
  or 
  

   Cretaceous. 
  

  

  " 
  Drake's 
  salt 
  works 
  are 
  described, 
  and 
  represented 
  in 
  section 
  ; 
  

   the 
  Winnfield 
  ' 
  ' 
  Marble 
  ' 
  ' 
  is 
  likewise 
  described 
  ; 
  and 
  a 
  list 
  of 
  all 
  

  

  