﻿94 
  Geological 
  Survey 
  of 
  Louisiana 
  [Sect. 
  

  

  Shells 
  were 
  collected 
  at 
  several 
  places 
  between 
  this 
  locality 
  and 
  

   the 
  Ouachita, 
  but 
  the 
  specimens 
  and 
  notes 
  were 
  left 
  with 
  a 
  

   gentleman 
  at 
  Rosefield 
  to 
  be 
  forwarded, 
  and 
  have 
  not 
  yet 
  been 
  

   received. 
  

  

  On 
  the 
  Harrisonburg 
  road 
  near 
  the 
  branch 
  to 
  Danville 
  about 
  a 
  

   mile 
  and 
  a 
  half 
  south 
  of 
  Rosefield, 
  fossiliferous 
  yellow 
  limestone 
  

   concretions 
  outcrop 
  in 
  the 
  road. 
  They 
  are 
  seen 
  again 
  near 
  

   Sone's 
  store, 
  a 
  mile 
  farther 
  south. 
  About 
  three 
  miles 
  east 
  of 
  

   Sone's 
  store 
  fossils 
  are 
  common 
  near 
  the 
  saw-mill. 
  Near 
  the 
  

   center 
  of 
  Sec. 
  31, 
  11 
  N., 
  there 
  is 
  a 
  small 
  prairie 
  with 
  shells. 
  In 
  

   bottoms 
  below, 
  beds 
  of 
  lignite, 
  which 
  have 
  at 
  different 
  times 
  

   attracted 
  prospectors, 
  are 
  reported. 
  

  

  Grand 
  Gulf 
  

  

  HiSTORlCAI. 
  

  

  Origin 
  of 
  the 
  term 
  Grand 
  Gulf. 
  — 
  This 
  formation 
  was 
  first 
  

   named 
  by 
  Wailes, 
  then 
  State 
  'geologist 
  of 
  Mississippi, 
  from 
  a 
  

   typical 
  exposure 
  at 
  Grand 
  Gulf, 
  Mississippi.* 
  It 
  was 
  described 
  

   at 
  length 
  by 
  Hilgard 
  in 
  i860 
  in 
  his 
  report 
  on 
  the 
  Geology 
  and 
  

   Agriculture 
  of 
  Mississippi. 
  f 
  

  

  The 
  Pascagoula 
  formation 
  {Mioce7ie). 
  — 
  In 
  1890, 
  Mr. 
  I,. 
  C. 
  

   Johnson 
  discovered 
  near 
  Vernal 
  P. 
  O., 
  Miss., 
  and 
  at 
  other 
  local- 
  

   ities 
  on 
  the 
  Pascagoula 
  river 
  a 
  series 
  of 
  marine 
  beds 
  in 
  the 
  upper 
  

   part 
  of 
  Hilgard' 
  s 
  Grand 
  Gulf. 
  These 
  marine 
  beds 
  he 
  named 
  

   the 
  Pascagoula 
  formation. 
  From 
  the 
  fossils 
  collected 
  at 
  this 
  

   locality, 
  Gnathodon 
  Johnso?ii, 
  Mactra 
  lateralis 
  and 
  a 
  large 
  oyster 
  

   resembling 
  O. 
  titan 
  of 
  the 
  west 
  coast, 
  DallJ 
  has 
  concluded 
  that 
  

   the 
  beds 
  are 
  equivalents 
  of 
  the 
  Chesapeaks 
  Miocene. 
  || 
  It 
  seems 
  

   very 
  probably 
  that 
  this 
  formation 
  is 
  represented 
  in 
  Louisiana, 
  in 
  

   the 
  southern 
  part 
  of 
  what 
  is 
  now 
  called 
  Grand 
  Gulf 
  territory, 
  

   but, 
  thus 
  far, 
  it 
  has 
  not 
  been 
  recognized. 
  

  

  Study 
  of 
  the 
  Louisiana 
  beds 
  of 
  this 
  period. 
  — 
  In 
  18 
  16, 
  William 
  

   Darby 
  recognized 
  the 
  northern 
  edge 
  of 
  what 
  is 
  now 
  called 
  the 
  

  

  * 
  Report 
  on 
  the 
  Agr. 
  and 
  Geol. 
  of 
  Miss., 
  1854, 
  pp. 
  216-217. 
  

   tPp. 
  147-154, 
  i860. 
  

  

  X 
  Dall 
  and 
  Harris, 
  Bull. 
  U. 
  S. 
  Geol. 
  Surv., 
  No. 
  84, 
  1892, 
  p. 
  164. 
  

   II 
  Bull. 
  Geol. 
  Soc. 
  Am. 
  vol. 
  5, 
  p. 
  157, 
  1894 
  ; 
  i8th 
  An. 
  Rept. 
  U. 
  S. 
  Geol. 
  

   Surv., 
  1896-1897, 
  part 
  II, 
  p. 
  339. 
  

  

  