﻿OF 
  LINCOLNSHIRE 
  NEOCOMIAN. 
  

  

  243 
  

  

  On 
  the 
  Lincoln 
  and 
  Louth 
  railway 
  is 
  a 
  cutting 
  (fig. 
  3), 
  near 
  

   Benniworth-Haven 
  House, 
  which 
  shows 
  a 
  thickness 
  of 
  20 
  feet 
  of 
  

   sands, 
  surmounted 
  by 
  the 
  Ironstone 
  about 
  9 
  feet 
  in 
  thickness. 
  

   From 
  the 
  latter 
  I 
  have 
  obtained 
  a 
  richer 
  suite 
  of 
  fossils 
  than 
  from 
  

   anywhere 
  else 
  in 
  the 
  district 
  ; 
  they 
  are 
  not 
  equally 
  fine 
  throughout 
  

   the 
  deposit, 
  but 
  are 
  best 
  preserved 
  in 
  a 
  seam 
  near 
  the 
  base. 
  

  

  Fig. 
  3. 
  — 
  Sketch 
  of 
  Benniworth-Haven 
  Cutting. 
  

  

  a. 
  Lower 
  Sands. 
  

  

  b. 
  Ironstone. 
  

  

  c. 
  Soil 
  with 
  flints 
  from 
  the 
  drift. 
  

  

  For 
  the 
  accompanying 
  sketch 
  of 
  Benniworth-Haven 
  cutting 
  I 
  am 
  

   indebted 
  to 
  Mr. 
  "W. 
  Keeping, 
  M.A. 
  Three 
  divisions 
  of 
  the 
  ironstone 
  

   may 
  be 
  noted, 
  viz. 
  : 
  — 
  (1) 
  the 
  better 
  bed 
  as 
  described 
  ; 
  (2) 
  lighter- 
  

   coloured, 
  more 
  argillaceous, 
  and 
  with 
  cuboidal 
  fracture 
  ; 
  (3) 
  brown 
  

   crumbling 
  stone. 
  

  

  The 
  Upper 
  Sands 
  are 
  usually 
  said 
  to 
  be 
  unfossiliferous 
  ; 
  we 
  have 
  

   been 
  also 
  unsuccessful 
  in 
  finding 
  fossils 
  therein, 
  except 
  in 
  the 
  phos- 
  

   phatide 
  nodules 
  ; 
  these 
  are 
  fragmentary, 
  probably 
  derived, 
  and 
  

   scarcely 
  specifically 
  determinable. 
  The 
  following 
  genera, 
  however, 
  

   occur 
  — 
  Ammonites, 
  Pleurotomaria, 
  Requienia 
  ?, 
  Modiola, 
  Oyprina 
  ?, 
  

   Myacites, 
  Pholadomya 
  ?, 
  and 
  Pholadidea. 
  Lithologically, 
  these 
  no- 
  

   dules 
  agree 
  exactly 
  with 
  those 
  from 
  the 
  Neocomian 
  beds 
  of 
  the 
  

   Bedford 
  and 
  Cambridgeshire 
  area. 
  

  

  The 
  Upper 
  Sands 
  are 
  well 
  seen 
  in 
  the 
  cutting 
  at 
  the 
  west 
  end 
  of 
  

   "Withcall 
  tunnel 
  (fig. 
  4). 
  

  

  Fig. 
  4.— 
  Sketch 
  of 
  Cutting 
  at 
  West 
  End 
  of 
  Withcall 
  Tunnel 
  

  

  a. 
  Brownish 
  and 
  reddish-brown 
  sands. 
  b. 
  Band 
  of 
  phosphatic 
  nodules. 
  

  

  c. 
  Line 
  of 
  ferruginous 
  concretions. 
  d. 
  Eed 
  Chalk, 
  9 
  feet. 
  

  

  e. 
  Greyish-white 
  chalk, 
  8 
  to 
  15 
  feet 
  above 
  the 
  tunnel. 
  

   /. 
  Bearranged 
  red 
  and 
  white 
  chalk. 
  

  

  Fully 
  30 
  feet 
  of 
  the 
  Upper 
  Sands 
  are 
  here 
  exposed 
  ; 
  they 
  are 
  very 
  

  

  