﻿42 
  Genlogical 
  Survey 
  of 
  I,ouisiana 
  [Sect. 
  

  

  Cope. 
  — 
  This 
  author 
  published 
  in 
  1894* 
  some 
  notes 
  " 
  On 
  Some 
  

   Pleistocene 
  Mammalia 
  from 
  Petite 
  Anse, 
  La." 
  

  

  He 
  describes 
  two 
  new 
  species 
  of 
  Mylodon 
  and 
  one 
  of 
  Eqtncs, 
  

   and 
  mentions 
  others. 
  (See 
  special 
  report 
  on 
  Five 
  Islands, 
  

   under 
  Petite 
  Anse). 
  

  

  Vaughan. 
  — 
  By 
  permission 
  of 
  the 
  Director 
  of 
  the 
  U. 
  S. 
  Geol. 
  

   Surv., 
  Mr. 
  T. 
  Way 
  land 
  Vaughan 
  published 
  in 
  1895 
  an 
  article 
  

   entitled 
  " 
  The 
  Stratigraphy 
  of 
  Northwestern 
  Louisiana."! 
  

  

  This 
  work 
  represents 
  the 
  results 
  of 
  several 
  visits 
  to 
  this 
  

   portion 
  of 
  the 
  State 
  by 
  the 
  author 
  dating 
  from 
  1889, 
  to 
  the 
  

   autumn 
  of 
  1894. 
  

  

  Vaughan's 
  treatment 
  of 
  the 
  subject 
  is 
  chronologic, 
  beginning 
  

   with 
  the 
  lowest 
  or 
  oldest 
  beds, 
  the 
  Cretaceous. 
  He 
  very 
  

   properly 
  doubts 
  Hilgard's 
  identification 
  of 
  Gryphcea 
  pitcheri 
  on 
  

   the 
  ground 
  that 
  this 
  is 
  a 
  Comanche 
  series 
  fossil 
  and 
  not 
  of 
  the 
  

   higher 
  glauconitic 
  horizon. 
  

  

  This 
  author 
  takes 
  exception 
  to 
  Lerch's 
  "disturbance 
  in 
  

   Louisiana 
  succeeding 
  the 
  close 
  of 
  the 
  Cretaceous 
  deposition," 
  

   and 
  insists 
  on 
  an 
  erosion 
  period 
  between 
  the 
  Cretaceous 
  and 
  

   Eocene. 
  Furthermore 
  he 
  believes 
  the 
  Cretaceous 
  strata 
  to 
  be 
  

   undisturbed, 
  or 
  now 
  quite 
  horizontal. 
  

  

  By 
  means 
  of 
  carefully 
  noting 
  the 
  distribution 
  of 
  fossil 
  

   remains 
  in 
  this 
  portion 
  of 
  the 
  State, 
  Vaughan 
  was 
  able 
  to 
  

   correct 
  some 
  of 
  the 
  errors 
  of 
  Lerch 
  as 
  to 
  the 
  distribution 
  of 
  the 
  

   Jackson 
  stage. 
  

  

  Unfortunately 
  he 
  regarded 
  Lerch's 
  "lower 
  lignitic," 
  and 
  

   Hilgard's 
  "Mansfield 
  group" 
  as 
  belonging 
  to 
  the 
  Lower 
  

   Claiborne. 
  

  

  He 
  is 
  doubtless 
  right 
  in 
  referring 
  Lerch's 
  " 
  Arcadia 
  Clays 
  " 
  

   to 
  the 
  Lower 
  Claiborne. 
  

  

  Some 
  of 
  Lerch's 
  "upper 
  lignitic" 
  beds 
  are 
  proven 
  to 
  be 
  

   Lower 
  Claiborne, 
  while 
  others, 
  as 
  at 
  Columbia, 
  are 
  referred 
  to 
  a 
  

   newly 
  named 
  substage, 
  the 
  " 
  Cocksfield 
  Ferry 
  beds." 
  

  

  Jackson 
  and 
  Vicksburg 
  localities 
  with 
  lists 
  of 
  fossils 
  are 
  given. 
  

   The 
  Grand 
  Gulf 
  beds 
  were 
  discussed 
  and 
  a 
  new 
  group 
  of 
  strata 
  

   is 
  described 
  under 
  the 
  name 
  Sparta 
  Sands. 
  

  

  * 
  Am. 
  Phil. 
  Soc. 
  Proc, 
  vol. 
  34, 
  pp. 
  458-468. 
  

   f 
  Amer. 
  Geologist, 
  vol. 
  15, 
  p. 
  205-229. 
  

  

  