﻿OF 
  LINCOLNSHIRE 
  NEOCOMIAN. 
  

  

  241 
  

  

  when 
  the 
  bed 
  is 
  hard 
  ; 
  and 
  if 
  soft, 
  the 
  test 
  is 
  usually 
  dissolved, 
  and 
  

   only 
  a 
  mould 
  remains. 
  

  

  The 
  junction 
  of 
  the 
  lower 
  sands 
  with 
  the 
  Kimmeridge 
  Clay 
  was 
  

   also 
  well 
  seen 
  in 
  a 
  cutting 
  a 
  few 
  hundred 
  yards 
  E. 
  of 
  S. 
  Willing- 
  

   ham 
  station 
  (fig. 
  2). 
  Here 
  the 
  greenish 
  sands, 
  where 
  they 
  lie 
  on 
  

   the 
  flaggy 
  Kimmeridge 
  shales, 
  contain 
  at 
  their 
  base 
  a 
  line 
  of 
  phos- 
  

   phatic 
  nodules. 
  

  

  Fig, 
  2. 
  — 
  Diagram 
  of 
  Railway 
  -cutting, 
  E. 
  of 
  S. 
  Willingham 
  Station. 
  

  

  a. 
  Kimmeridge 
  Clay. 
  b. 
  Line 
  of 
  Septaria. 
  c. 
  Line 
  of 
  phospkatic 
  nodules 
  in 
  

   d. 
  Lower 
  Sands, 
  e. 
  Surface 
  soil. 
  

  

  . 
  In 
  the 
  memoir 
  referred 
  to, 
  it 
  is 
  suggested 
  (I. 
  c. 
  p. 
  248) 
  that 
  about 
  

   Market 
  Rasen 
  the 
  lower 
  sand 
  and 
  sandstone 
  formed 
  extensive 
  

   rabbit-warrens 
  and 
  fir 
  plantations, 
  some 
  of 
  which 
  have 
  been 
  

   brought 
  into 
  cultivation. 
  We 
  are 
  however 
  of 
  opinion 
  that 
  these 
  

   tracts 
  are 
  covered 
  by 
  a 
  sand 
  of 
  quite 
  a 
  different 
  description, 
  viz. 
  a 
  

   member 
  of 
  the 
  drift 
  series 
  ; 
  we 
  think 
  a 
  consideration 
  of 
  the 
  level 
  

   up 
  to 
  which 
  the 
  Kimmeridge 
  Clay 
  occurs 
  above 
  the 
  valley 
  — 
  over 
  

   200 
  feet, 
  will 
  make 
  this 
  apparent; 
  moreover 
  the 
  last-mentioned 
  

   sands 
  differ 
  lithologically 
  in 
  a 
  marked 
  manner 
  from 
  the 
  JSTeocomian 
  

   sands. 
  

  

  These 
  lower 
  sands 
  in 
  the 
  excavations 
  near 
  Claxby 
  are 
  24 
  feet 
  

   thick. 
  The 
  fossils 
  obtained 
  from 
  them 
  are 
  the 
  following 
  : 
  — 
  Belem- 
  

   nites, 
  sp. 
  , 
  Ammonites 
  Koenigi, 
  Sow., 
  A. 
  plicomphalus, 
  Sow., 
  and 
  

   others 
  ; 
  species 
  of 
  Ohemnitzia, 
  Phasianella, 
  Pleurotomaria, 
  Trochus, 
  

   Crepidula, 
  Pileopsis, 
  and 
  Natica 
  ; 
  Peeten 
  Cottaldinus, 
  d'Orb., 
  P. 
  or- 
  

   bicularis, 
  Sow., 
  Cucullaio, 
  donningtonensis, 
  Keep., 
  MSS., 
  Cardium 
  

   subhillanum, 
  Leym., 
  Trigonia 
  Keepingi, 
  Lye, 
  T. 
  tealbyensis, 
  Lye, 
  

   T. 
  ingens, 
  Lye. 
  ; 
  species 
  of 
  Inoceramus, 
  Avicula, 
  Area, 
  Tellina, 
  

   Lucina, 
  Cythercea, 
  Thetis, 
  Astarte, 
  Myacites, 
  Pholadomya, 
  LitJio- 
  

   domus, 
  &c. 
  

  

  Above 
  them 
  is 
  the 
  iron-ore 
  (fig. 
  1, 
  b), 
  an 
  argillaceous 
  ironshot 
  

   limestone, 
  i. 
  e. 
  full 
  of 
  dark-brown 
  oolitic 
  grains 
  of 
  iron 
  oxide, 
  

   with 
  some 
  streaks 
  nearly 
  all 
  clay 
  and 
  devoid 
  of 
  the 
  iron 
  grains. 
  

   This 
  set 
  of 
  beds 
  is 
  9-10 
  feet 
  thick, 
  and 
  may 
  be 
  followed 
  in 
  the 
  

   escarpment 
  all 
  the 
  way 
  from 
  the 
  north 
  or 
  Nettleton 
  end 
  of 
  the 
  

   ridge. 
  

  

  The 
  two 
  terraces 
  of 
  the 
  escarpment 
  formed 
  by 
  the 
  harder 
  beds 
  

   are 
  a 
  marked 
  physical 
  feature 
  of 
  this 
  ridge. 
  

  

  The 
  fossils 
  of 
  the 
  Ironstone 
  differ 
  somewhat 
  considerably 
  from 
  

   those 
  of 
  the 
  clays 
  and 
  limestone 
  above, 
  and 
  are 
  much 
  more 
  

   numerous. 
  They 
  are 
  included 
  by 
  Prof. 
  Judd 
  in 
  his 
  " 
  Tealby 
  Series." 
  

   The 
  following 
  is 
  a 
  list 
  of 
  them 
  : 
  — 
  Belemnites 
  lateralis, 
  Phil., 
  B. 
  

  

  