﻿164 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  shire, 
  I 
  have 
  been 
  led 
  to 
  believe 
  that, 
  immediately 
  previous 
  to 
  the 
  

   deposition 
  of 
  the 
  Upper 
  Lias, 
  some 
  disturbing 
  cause 
  for 
  a 
  time 
  

   changed 
  the 
  direction 
  of 
  the 
  currents 
  which 
  had 
  brought 
  here 
  the 
  

   mud 
  and 
  sand 
  of 
  the 
  Lower 
  and 
  Middle 
  divisions, 
  and 
  that, 
  in 
  place 
  

   of 
  continuing 
  gently 
  to 
  lay 
  down 
  these 
  deposits, 
  the 
  action 
  of 
  the 
  

   water 
  was 
  for 
  a 
  time, 
  and 
  over 
  certain 
  districts, 
  confined 
  to 
  the 
  

   destruction 
  of 
  beds 
  previously 
  formed 
  and 
  consolidated 
  " 
  *. 
  

  

  Mr. 
  Day 
  and 
  myself 
  had 
  ample 
  opportunities 
  of 
  examining 
  this 
  

   bed, 
  both 
  high 
  up 
  in 
  the 
  cliff 
  and 
  from 
  fallen 
  blocks 
  on 
  the 
  shore. 
  

   I 
  doubt 
  not 
  it 
  is 
  the 
  precise 
  equivalent 
  of 
  the 
  Calvados 
  Middle 
  and 
  

   Upper 
  Lias, 
  the 
  figures 
  of 
  the 
  fossils 
  in 
  which 
  Deslongchamps 
  and 
  

   D'Orbigny 
  have 
  made 
  classical. 
  The 
  topmost 
  layer 
  also 
  contains 
  

   from 
  18 
  to 
  20 
  species. 
  Probably 
  nothing 
  in 
  Britain 
  equals 
  this 
  bed 
  

   for 
  the 
  crowded 
  condition 
  and 
  perfection 
  of 
  its 
  fossils, 
  also 
  a 
  cha- 
  

   racter 
  which 
  to 
  some 
  extent 
  applies 
  to 
  the 
  whole 
  series 
  of 
  the 
  Middle 
  

   Lias 
  group 
  below. 
  

  

  The 
  literature 
  of 
  the 
  Lias 
  and 
  Oolite 
  has 
  been 
  enriched 
  by 
  the 
  Kevl 
  

   J. 
  E. 
  Cross 
  with 
  a 
  description 
  of 
  a 
  previously 
  almost 
  unknown 
  area. 
  

   In 
  his 
  paper 
  in 
  our 
  ' 
  Quarterly 
  Journal' 
  for 
  Nov. 
  1875 
  f, 
  Mr. 
  Cross 
  

   described 
  a 
  considerable 
  portion 
  of 
  North-west 
  Lincolnshire, 
  carrying 
  

   on, 
  indeed, 
  the 
  work 
  done 
  by 
  Prof. 
  Judd 
  and 
  Mr. 
  Sharp 
  in 
  the 
  southern 
  

   part 
  of 
  the 
  county. 
  " 
  It 
  is," 
  remarks 
  Mr. 
  Cross, 
  " 
  a 
  corner 
  of 
  the 
  

   land 
  unknown 
  to 
  fame," 
  but 
  now 
  " 
  celebrated 
  commercially 
  by 
  the 
  

   recent 
  discovery 
  of 
  a 
  most 
  extensive 
  and 
  valuable 
  deposit 
  of 
  iron- 
  

   ore." 
  This 
  iron-ore 
  deposit 
  occurs 
  in 
  the 
  Lower 
  Lias, 
  in 
  the 
  

   zones 
  of 
  Arietites 
  Buclclandi 
  and 
  Arietites 
  semicostatus. 
  Mr. 
  Cross 
  

   minutely 
  describes 
  the 
  physical 
  aspect 
  of 
  the 
  beds, 
  ranging 
  from 
  

   the 
  Angulatus-series 
  to 
  the 
  Marlstone, 
  above 
  the 
  zone 
  of 
  JSc/oceras 
  

   capricornus, 
  and 
  carefully 
  describes 
  in 
  the 
  text 
  of 
  his 
  paper 
  the 
  

   leading 
  features 
  of 
  the 
  successive 
  stages, 
  and 
  their 
  chief 
  associated 
  

   fossils. 
  His 
  paper 
  describes 
  a 
  series 
  of 
  ascending 
  strata 
  from 
  the 
  

   Kcupcr 
  to 
  the 
  Great 
  Oolite 
  inclusive, 
  with 
  most 
  carefully 
  prepared 
  

   lists 
  of 
  fossils 
  from 
  each 
  formation. 
  I 
  can 
  here 
  only 
  notice 
  the 
  

   Lias. 
  From 
  the 
  Lower 
  Lias 
  of 
  the 
  valley 
  of 
  tbe 
  Trent, 
  Fordingham 
  

   railway-cutting, 
  the 
  Scunthorp 
  ironstone, 
  and 
  the 
  Pecten-bed 
  and 
  

   its 
  clay, 
  Mr. 
  Cross 
  has 
  obtained 
  48 
  genera, 
  and 
  110 
  species, 
  viz. 
  : 
  — 
  

  

  Genera. 
  Species. 
  

  

  Ammonites 
  1 
  19 
  

  

  Eelemnites 
  1 
  4 
  

  

  Nautilus 
  1 
  1 
  

  

  Gasteropoda 
  3 
  7 
  

  

  Dimyaria 
  26 
  37 
  

  

  Monomyaria 
  9 
  31 
  

  

  Brachiopoda 
  5 
  7 
  

  

  Echinodermata 
  1 
  3 
  

  

  Ccelenterata 
  1 
  1 
  

  

  48 
  

  

  110 
  

  

  * 
  Day, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xix. 
  p. 
  294. 
  

  

  t 
  " 
  On 
  the 
  Geology 
  of 
  North-west 
  Lincolnshire," 
  by 
  the 
  Rev. 
  J. 
  E. 
  Cross, 
  

   M.A., 
  F.G 
  S., 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxxi. 
  pp. 
  115-130 
  (1875). 
  

  

  