﻿COTTESWOLD, 
  MIDFOKD, 
  AND 
  YEOVIL 
  SANDS, 
  ETC. 
  441 
  

  

  other 
  hand, 
  at 
  p. 
  253, 
  he 
  states 
  that 
  at 
  Ilminster 
  the 
  sands 
  of 
  the 
  

   Inferior 
  Oolite 
  (that 
  is 
  the 
  Yeovil 
  Sands) 
  begin 
  above 
  a 
  bed 
  filled 
  

   with 
  Amm. 
  jurensis, 
  discoides, 
  radians, 
  &c. 
  Here 
  we 
  have 
  the 
  

   keynote 
  of 
  the 
  whole 
  affair, 
  published 
  more 
  than 
  thirty 
  years 
  ago. 
  

   Dr. 
  Oppel 
  saw 
  that 
  the 
  Cotteswold 
  Sands 
  and 
  the 
  Yeovil 
  Sands 
  

   are 
  on 
  two 
  entirely 
  different 
  horizons 
  ; 
  and 
  actually 
  placing 
  the 
  

   one 
  series 
  in 
  the 
  Lias 
  and 
  the 
  other 
  in 
  the 
  Inferior 
  Oolite, 
  he 
  

   located 
  between 
  them 
  the 
  zone 
  of 
  Amm. 
  jurensis. 
  Yet, 
  in 
  spite 
  of 
  

   what 
  Oppel 
  had 
  written, 
  the 
  position 
  of 
  the 
  " 
  Sands 
  " 
  remained 
  a 
  

   bone 
  of 
  contention 
  for 
  very 
  many 
  years, 
  and 
  but 
  little 
  notice 
  was 
  

   taken 
  of 
  his 
  statements. 
  

  

  It 
  was 
  also 
  in 
  the 
  year 
  1856 
  that 
  Dr. 
  Wright 
  proposed* 
  to 
  assign 
  

   to 
  the 
  Upper 
  Lias 
  those 
  Yellow 
  Sands 
  of 
  Gloucestershire, 
  Somerset, 
  

   and 
  Dorset 
  which 
  had, 
  from 
  the 
  time 
  of 
  William 
  Smith, 
  been 
  

   classed 
  as 
  " 
  Sands 
  of 
  the 
  Inferior 
  Oolite." 
  With 
  them 
  he 
  also 
  

   united 
  the 
  marly-limestone 
  cap 
  which 
  overlies 
  them 
  in 
  the 
  former 
  

   county, 
  and 
  which 
  is 
  now 
  known 
  as 
  the 
  Cephalopoda-bed 
  of 
  Glou- 
  

   cestershire. 
  Finding 
  that 
  the 
  Sands 
  of 
  Dorset 
  reposed 
  beneath 
  a 
  

   similar 
  lithological 
  cap, 
  he 
  considered 
  this 
  also 
  to 
  be 
  on 
  the 
  same 
  

   horizon 
  ; 
  and 
  thus 
  it 
  came 
  to 
  pass 
  that 
  he 
  included 
  in 
  the 
  Upper 
  

   Lias 
  the 
  Murchisonce- 
  zone, 
  the 
  Concavum-beds, 
  and 
  even 
  part 
  of 
  the 
  

   Parkinsoni-zone 
  of 
  the 
  Bradford- 
  Abb 
  as 
  and 
  Halfway-house 
  strata. 
  

   It 
  is 
  instructive 
  to 
  notice 
  the 
  species 
  of 
  Ammonites 
  which 
  he 
  quotes, 
  

   from 
  the 
  so-called 
  Upper- 
  Lias 
  Cephalopoda-bed 
  of 
  Bradford 
  Abbas, 
  

   in 
  support 
  of 
  this 
  view, 
  p. 
  31 
  : 
  — 
  

  

  1. 
  Ammonites 
  jurensis, 
  Zieten. 
  

  

  2. 
  ,, 
  concavus, 
  Sowerby. 
  

  

  3. 
  „ 
  dorsetensis, 
  Wright. 
  

  

  4. 
  „ 
  variabilis, 
  oVOrbigny. 
  

  

  5. 
  „ 
  striatulus, 
  Sowerby. 
  

  

  6. 
  ,, 
  insignis, 
  Schubler. 
  

  

  Because 
  we 
  know, 
  at 
  the 
  present 
  day, 
  that 
  of 
  these 
  six 
  species 
  the 
  

   identification 
  of 
  five 
  must 
  have 
  been 
  incorrect, 
  while 
  the 
  one 
  whose 
  

   identification 
  is 
  correct 
  — 
  A. 
  concavus 
  — 
  happens 
  not 
  to 
  be 
  an 
  Upper- 
  

   Lias 
  Ammonite 
  at 
  all. 
  The 
  correct 
  names 
  of 
  the 
  others 
  are 
  the 
  fol- 
  

   lowing 
  : 
  — 
  

  

  1. 
  Lytoceras 
  confusum, 
  S. 
  Buckm. 
  

  

  3. 
  Parkinsonia 
  Parkinsoni 
  {Sowerby). 
  

  

  4. 
  Soiminia, 
  sp. 
  

  

  5. 
  Dumortieria 
  grammoceroides, 
  Haug. 
  

  

  6. 
  Hammatoceras 
  amaltheiforme 
  ( 
  Vacek), 
  or 
  a 
  near 
  ally. 
  

  

  In 
  1860 
  Dr. 
  Wright 
  f 
  removed 
  the 
  Bradford-Abbas 
  beds 
  from 
  

   this 
  position 
  to 
  place 
  them, 
  also 
  incorrectly, 
  in 
  the 
  Humphriesianum- 
  

   zone, 
  and 
  then 
  noticed 
  the 
  existence 
  of 
  another 
  bed 
  on 
  the 
  

   horizon, 
  as 
  he 
  supposed, 
  of 
  the 
  Gloucestershire 
  Cephalopoda-bed. 
  

   This 
  bed, 
  together 
  with 
  the 
  sands, 
  he 
  classes 
  as 
  " 
  Upper 
  Lias 
  Sand- 
  

   zone 
  of 
  A.jurensis" 
  This 
  opinion 
  remained 
  practically 
  unchanged. 
  

  

  * 
  " 
  The 
  Palaeontological 
  and 
  Stratigraphical 
  Eelations 
  of 
  the 
  so-called 
  Sands 
  

   of 
  the 
  Inferior 
  Oolite," 
  Quart. 
  Journ. 
  Geo!. 
  Soc. 
  vol. 
  xii. 
  p. 
  292 
  (1856). 
  

   t 
  " 
  Interior 
  Oolite," 
  Quart. 
  Journ. 
  Greol. 
  Soc. 
  vol. 
  xvi. 
  

  

  