﻿300 
  Geological 
  Survey 
  of 
  L,ouisiana 
  [Sect. 
  

  

  horizons 
  to 
  which 
  they 
  belong 
  are 
  certainly 
  to 
  be 
  found 
  east 
  of 
  

   the 
  Sabine, 
  though 
  generally 
  not 
  well 
  exposed. 
  

  

  Had 
  these 
  localities 
  and 
  their 
  fossils 
  been 
  described 
  in 
  the 
  

   Texas 
  Survey 
  reports 
  or 
  elsewhere 
  a 
  mere 
  reference 
  to 
  them 
  

   would 
  have 
  sufficed 
  here. 
  But 
  since 
  the 
  Sabinetown 
  fauna 
  has 
  

   long 
  been 
  misinterpreted 
  and 
  that 
  at 
  Pendleton 
  has 
  been 
  unknown 
  

   to 
  previous 
  writers, 
  we 
  have 
  no 
  hesitation 
  in 
  devoting 
  some 
  time 
  

   to 
  their 
  study 
  and 
  space 
  to 
  their 
  elucidation. 
  

  

  PELECYPODA 
  

   Ostrea 
  thirsae, 
  Plate 
  53, 
  fig. 
  i. 
  

  

  Syn. 
  — 
  Gryphcea 
  thirsce 
  Gabb, 
  Acad. 
  Nat. 
  Sci., 
  Phila., 
  Proc. 
  1861, 
  

  

  P- 
  329- 
  

   Ostrea 
  thirscB 
  Heilp., 
  U. 
  S. 
  Geol. 
  Surv., 
  3d 
  Annual, 
  p. 
  311, 
  

  

  pi. 
  63, 
  figs. 
  4, 
  5, 
  6. 
  

   O. 
  thirscB 
  Har., 
  Bull. 
  Amer. 
  Pal., 
  vol. 
  2, 
  p. 
  40, 
  pi. 
  12, 
  

   figs. 
  5, 
  6. 
  

   This 
  species 
  was 
  originally 
  described 
  from 
  Nanafalia, 
  Ala., 
  

   where 
  it 
  is 
  found 
  in 
  great 
  numbers. 
  

  

  These 
  specimens 
  have 
  in 
  some 
  instances 
  the 
  true 
  thirsce 
  appear- 
  

   ance, 
  but 
  often 
  they 
  grade 
  towards 
  what 
  we 
  have 
  believed 
  to 
  be 
  

   the 
  young 
  of 
  a 
  variety 
  of 
  O. 
  trigonalis 
  at 
  Woods 
  bluflf. 
  See 
  pi. 
  

   12, 
  Bull. 
  Amer. 
  Pal., 
  vol. 
  2. 
  

  

  Localities.— 
  M2in\^z.\n\\^ 
  R. 
  R. 
  cut; 
  well, 
  S. 
  W. 
  ^ 
  S. 
  W. 
  ;^ 
  S. 
  

   18, 
  7 
  N. 
  10 
  W. 
  

   Horizon. 
  — 
  Lower 
  Lignitic. 
  

   Ostrea, 
  sp. 
  

  

  There 
  are 
  numerous 
  fragments 
  of 
  large 
  oysters 
  found 
  at 
  Pen- 
  

   dleton 
  and 
  elsewhere 
  ; 
  but 
  so 
  far 
  we 
  have 
  not 
  found 
  sufficiently 
  

   perfect 
  specimens 
  to 
  warrant 
  specific 
  identification. 
  

  

  Modiola 
  alabamensis, 
  Plate 
  53, 
  fig. 
  2. 
  

  

  Syn. 
  — 
  M. 
  alaba?ne?isis 
  Aid., 
  Bull. 
  Amer. 
  Paleont., 
  vol. 
  i, 
  p. 
  68, 
  

   pi. 
  6, 
  fig. 
  13, 
  1895. 
  

  

  The 
  specimens 
  found 
  are 
  from 
  Pendleton, 
  Texas. 
  It 
  will 
  

   doubtless 
  be 
  found 
  in 
  Sabine 
  and 
  other 
  parishes 
  of 
  La., 
  where 
  

   the 
  Lower 
  Lignitic 
  rocks 
  crop 
  out. 
  

  

  Pinna 
  sp 
  

  

  No 
  special 
  importance 
  is 
  attached 
  to 
  the 
  finding 
  of 
  fragments 
  

  

  