﻿456 
  E. 
  WILSON 
  ON 
  THE 
  RUSTICS 
  OF 
  NOTTINGHAMSHIRE. 
  

  

  beds 
  " 
  are 
  found 
  in 
  a 
  general 
  way 
  20 
  feet 
  or 
  so 
  of 
  green 
  marls 
  and 
  

   calcareous 
  marlstones 
  (with 
  or 
  without 
  red 
  mottlings) 
  which, 
  under 
  

   the 
  term 
  "Tea-green 
  Marls," 
  Mr. 
  R. 
  Etheridge, 
  E.R.S., 
  has 
  pro- 
  

   posed 
  to 
  class 
  with 
  the 
  Rhaetics* 
  : 
  and 
  in. 
  this 
  classification 
  he 
  has, 
  

   as 
  a 
  justly 
  high 
  authority 
  on 
  all 
  that 
  pertains 
  to 
  these 
  beds, 
  been 
  

   followed, 
  though 
  by 
  no 
  means 
  universally, 
  by 
  other 
  geologistsf 
  . 
  The 
  

   late 
  Mr. 
  Charles 
  Moore, 
  another 
  high 
  authority 
  on 
  Rhsetic 
  geology, 
  

   also 
  appears 
  to 
  have 
  been 
  of 
  this 
  opinion. 
  For 
  reasons 
  identical 
  

   with 
  those 
  stated 
  above, 
  I 
  am 
  inclined 
  to 
  agree 
  with 
  Dr. 
  Thomas 
  

   Wright, 
  F.R.S., 
  and 
  others, 
  who 
  consider 
  that 
  these 
  "Tea-green 
  

   Marls" 
  properly 
  belong 
  to 
  the 
  Iveuper 
  formation 
  J. 
  However 
  this 
  

   may 
  be, 
  it 
  will 
  not 
  materially 
  affect 
  the 
  question 
  of 
  the 
  age 
  of 
  the 
  

   similar 
  beds 
  in 
  Notts 
  ; 
  for 
  it 
  would 
  be 
  impossible 
  to 
  prove 
  that 
  the 
  

   " 
  Tea-green 
  Marls 
  " 
  of 
  the 
  West 
  of 
  England 
  were 
  homotaxial 
  with 
  

   the 
  green-coloured 
  marls 
  that 
  occupy 
  the 
  same 
  relative 
  position 
  be- 
  

   neath 
  the 
  Avicula-contorta 
  shales 
  in 
  that 
  county. 
  Probably 
  in 
  both 
  

   districts 
  these 
  green 
  marls 
  were 
  once 
  red 
  in 
  colour 
  and 
  non-calca- 
  

   reous, 
  and 
  have 
  since 
  become 
  bleached 
  and 
  calcareous 
  in 
  part 
  by 
  the 
  

   downward 
  infiltration 
  into 
  them 
  of 
  some 
  deoxidizing 
  chemical 
  agent 
  

   and 
  carbonate 
  of 
  lime, 
  derived 
  from 
  the 
  decomposition 
  of 
  the 
  

   abundant 
  organic 
  remains 
  of 
  the 
  overlying 
  A.-contorta 
  shales. 
  The 
  

   very 
  general 
  occurrence 
  of 
  20 
  feet 
  or 
  so 
  of 
  " 
  greenish 
  marls 
  " 
  at 
  the 
  

   top 
  of 
  the 
  Keuper-marls 
  in 
  this 
  country, 
  is 
  a 
  coincidental 
  result 
  of 
  

   discoloration 
  §. 
  Neither 
  the 
  textural 
  characters, 
  the 
  stratigraphical 
  

   relations, 
  nor 
  the 
  organic 
  remains 
  of 
  these 
  beds, 
  justify 
  us 
  in 
  sepa- 
  

   rating 
  them 
  from 
  the 
  rest 
  of 
  the 
  Iveuper 
  formation 
  and 
  classing 
  them 
  

   as 
  Kinetic. 
  

  

  Discussion. 
  

  

  Rev. 
  A. 
  Irving 
  said 
  that 
  the 
  division 
  of 
  Mr. 
  Wilson 
  was 
  the 
  same 
  

   as 
  that 
  adopted 
  by 
  the 
  German 
  geologists. 
  He 
  also 
  knew 
  the 
  district 
  

   well, 
  and 
  could 
  confirm 
  Mr. 
  Wilson's 
  statement 
  as 
  to 
  the 
  erosion 
  at 
  

   the 
  base 
  of 
  the 
  Avicula-contorta 
  zone, 
  and 
  agreed 
  with 
  the 
  propriety 
  

   of 
  adDpting 
  this 
  line 
  of 
  division. 
  

  

  * 
  Proe. 
  Cotteswolds 
  Naturalists' 
  Field 
  Club, 
  1864. 
  Trans. 
  Cardiff 
  Nat. 
  Soc. 
  

   vol. 
  iii. 
  pt. 
  2, 
  1872. 
  

  

  t 
  "Khaetics 
  of 
  Leicester," 
  by 
  W. 
  J. 
  Harrison, 
  F.G.S., 
  Quart. 
  Journ. 
  Geol. 
  

   Soc. 
  187G. 
  Sketch 
  of 
  the 
  Geology 
  of 
  Lincolnshire, 
  by 
  W. 
  J. 
  Harrison, 
  F.G.S., 
  

   1882. 
  Geology 
  of 
  England 
  and 
  Wales, 
  by 
  H. 
  B. 
  Woodward, 
  F.G.S., 
  1876. 
  

  

  I 
  Monograph 
  of 
  Lias 
  Ammonites, 
  by 
  Dr. 
  Thomas 
  Wright, 
  F.R.S., 
  Pal. 
  Soc. 
  

   Memoirs, 
  1880, 
  &c. 
  

  

  § 
  The 
  thickness 
  of 
  the 
  Green 
  Marls, 
  both 
  in 
  the 
  Midland 
  counties 
  and 
  in 
  the 
  

   West 
  of 
  England, 
  varies 
  appreciably 
  at 
  different 
  places 
  not 
  far 
  distant 
  (10 
  to 
  

   30, 
  or 
  ?80 
  feet 
  at 
  Camel 
  Hill). 
  The 
  occasional 
  presence 
  of 
  red 
  blotches 
  in 
  

   these 
  green 
  beds 
  indicates 
  that 
  they 
  were 
  once 
  red 
  beds 
  that 
  have 
  been 
  stained 
  

   green, 
  not 
  green 
  beds 
  that 
  have 
  been 
  stained 
  red. 
  

  

  