﻿II] 
  General 
  Geology 
  : 
  Lower 
  Claiboene 
  Eocene 
  77 
  

  

  beds 
  a 
  sack 
  of 
  marl 
  was 
  obtained 
  for 
  analysis, 
  but 
  has 
  not 
  yet 
  

   been 
  reported 
  upon. 
  

  

  The 
  hill 
  back 
  of 
  the 
  mills 
  contains 
  several 
  ledges 
  of 
  Ostrea 
  

   falciformis 
  in 
  impure 
  limestone. 
  

  

  Provencal. 
  — 
  A 
  very 
  typical 
  Lower 
  Claiborne 
  exposure 
  occurs 
  

   on 
  the 
  north 
  side 
  of 
  the 
  R. 
  R. 
  track 
  about 
  one-half 
  mile 
  west 
  of 
  

   Provencal. 
  

  

  Ostrea 
  falciformis 
  is 
  in 
  great 
  abundance 
  associated 
  with 
  a 
  

   small 
  Orbitolite, 
  and 
  imbedded 
  in 
  a 
  light 
  yellow 
  clay 
  marl. 
  The 
  

   region 
  has 
  the 
  usual 
  calcareous-land 
  flora. 
  

  

  Other 
  local 
  beds 
  of 
  "red 
  land 
  " 
  or 
  "black 
  land 
  " 
  were 
  seen 
  

   or 
  heard 
  of 
  about 
  Provencal. 
  Railroad 
  cuts 
  were 
  examined 
  as 
  

   far 
  castas 
  Robertsville, 
  where 
  an 
  interesting 
  and 
  fossiliferous 
  out- 
  

   crop 
  occurs. 
  Ferruginous 
  nodules 
  about 
  one-half 
  to 
  one 
  inch 
  

   in 
  diameter 
  contain 
  LucincB 
  and 
  large 
  numbers 
  of 
  Area 
  rhomboi- 
  

   dalis. 
  The 
  light 
  gray 
  clays 
  have 
  scarlet 
  red 
  blotches 
  as 
  at 
  several 
  

   other 
  places. 
  

  

  The 
  residual 
  soil 
  is 
  of 
  a 
  light 
  gray, 
  and 
  a 
  slightly 
  reddish 
  hue. 
  

   Two 
  miles 
  south 
  of 
  Provencal, 
  on 
  the 
  Leesville 
  road, 
  the 
  same 
  

   phase 
  of 
  the 
  Lower 
  Claiborne 
  is 
  met 
  as 
  seen 
  on 
  the 
  R. 
  R. 
  west 
  

   of 
  Provencal 
  or 
  at 
  Natchitoches. 
  

  

  Another 
  interesting 
  locality, 
  where 
  marl 
  and 
  shells 
  have 
  been 
  

   reported, 
  is 
  at 
  a 
  Mr. 
  Stephen's 
  house, 
  half 
  way 
  between 
  Robe- 
  

   line 
  and 
  Natchitoches. 
  The 
  locality 
  was 
  not 
  visited 
  by 
  us, 
  hence 
  

   we 
  are 
  unable 
  to 
  say 
  whether 
  it 
  belongs 
  to 
  the 
  Lignitic 
  or 
  Lower 
  

   Claiborne 
  stage. 
  

  

  Natchitoches. 
  — 
  (See 
  special 
  report 
  on 
  this 
  area.) 
  

   Black 
  lake. 
  — 
  Small 
  black 
  land 
  prairies 
  covered 
  with 
  an 
  abun- 
  

   dance 
  of 
  oyster 
  shells 
  are 
  very 
  common 
  in 
  Natchitoches 
  parish 
  

   north 
  of 
  Black 
  lake. 
  

  

  Sectio7i 
  4, 
  II 
  N., 
  16 
  W. 
  — 
  Near 
  James 
  Thompson's 
  house, 
  two 
  

   and 
  one-half 
  miles 
  north 
  of 
  Black 
  lake, 
  i 
  mile 
  west 
  of 
  Remy 
  

   creek 
  and 
  south 
  of 
  the 
  Saline-Weaver's 
  ferry 
  road 
  is 
  a 
  small 
  

   prairie 
  covered 
  with 
  Ostrea 
  falciformis 
  , 
  and 
  O. 
  johnsoni. 
  It 
  is 
  on 
  

   the 
  very 
  crest 
  of 
  the 
  hill, 
  70 
  feet 
  above 
  the 
  surrounding 
  hollows 
  

   and 
  90-120 
  feet 
  above 
  Black 
  lake. 
  Just 
  south 
  of 
  the 
  prairie 
  

   and 
  6 
  feet 
  below 
  it 
  is 
  a 
  bed 
  of 
  quartz 
  and 
  chert 
  gravel. 
  The 
  

   creek 
  west 
  of 
  the 
  knoll 
  shows 
  the 
  following 
  sections 
  : 
  

  

  