﻿COTTESWOLD, 
  MIDFORD, 
  AND 
  YEOVIL 
  SANDS, 
  ETC. 
  465 
  

  

  evidence 
  in 
  favour 
  of 
  a 
  break 
  above 
  the 
  Concavum-zone 
  is 
  that 
  

   thirteen 
  species 
  of 
  Hildoceratidse 
  occur 
  in 
  the 
  Concavum-zone, 
  while 
  

   only 
  one 
  is 
  found 
  in 
  the 
  succeeding 
  Sauzei-zone. 
  

  

  The 
  geological 
  evidence 
  in 
  favour 
  of 
  a 
  break 
  above 
  the 
  Concavum- 
  

   zone 
  is 
  somewhat 
  striking. 
  The 
  failure 
  of 
  the 
  Humphriesianum- 
  and 
  

   Sauzei-zones 
  in 
  the 
  majority 
  of 
  English 
  localities 
  affords 
  us 
  at 
  once 
  a 
  

   very 
  definite 
  break, 
  and 
  leaves 
  us 
  with 
  few, 
  if 
  any, 
  places 
  where 
  

   there 
  would 
  be 
  anything 
  like 
  drawing 
  a 
  really 
  arbitrary 
  line. 
  At 
  

   Dundry 
  the 
  Humphriesianum- 
  and 
  Sauzei-zon.es 
  are 
  present 
  ; 
  at 
  Mil- 
  

   borne 
  Wick 
  and 
  in 
  the 
  neighbourhood 
  of 
  Sherborne 
  the 
  same 
  holds 
  

   good 
  ; 
  these 
  are 
  the 
  places 
  where 
  we 
  may 
  expect 
  opposition. 
  At 
  

   Burton 
  Bradstock 
  and 
  in 
  the 
  Bridport 
  neighbourhood 
  the 
  Hum- 
  

   phriesianum-zone 
  is 
  feebly 
  represented 
  ; 
  but 
  there 
  is 
  a 
  hiatus, 
  due 
  

   to 
  the 
  absence 
  of 
  the 
  Sauzei-zone 
  and 
  the 
  Goncavum-oe&$. 
  At 
  

   Halfway 
  House 
  and 
  Bradford 
  Abbas 
  the 
  Humphriesianum-zone 
  is 
  

   represented 
  by 
  a 
  very 
  thin 
  band, 
  of 
  itself 
  more 
  like 
  a 
  dividing-line 
  

   than 
  anything 
  else 
  ; 
  while 
  the 
  Sauzei-zone 
  is 
  probably 
  almost, 
  if 
  not 
  

   entirely, 
  absent. 
  At 
  Stoford, 
  East 
  Coker, 
  Haselbury, 
  Crewkerne, 
  

   Broad 
  Windsor, 
  and 
  around 
  Beaminster 
  the 
  Humphriesianum-zone 
  

   is 
  entirely 
  absent 
  — 
  the 
  Parkin 
  soni-zone 
  rests 
  upon 
  the 
  Murchisonce- 
  

   zone 
  or 
  the 
  Concavum-zone. 
  Further 
  north 
  we 
  find, 
  at 
  Cole, 
  the 
  

   Parhinsoni-zone 
  resting 
  on 
  the 
  Sauzei-zone, 
  and 
  this, 
  again, 
  on 
  the 
  

   Murchisonce-zone 
  — 
  the 
  Concavum-heds 
  are 
  absent 
  ; 
  while 
  at 
  all 
  other 
  

   places, 
  Castle 
  Cary, 
  Doulting, 
  Cranmore, 
  along 
  the 
  sides 
  of 
  the 
  Men- 
  

   dips, 
  at 
  Eadstock, 
  at 
  Midford, 
  and 
  at 
  Bath 
  the 
  Parkinsoni-zone 
  

   rests 
  on 
  sands 
  and, 
  in 
  some 
  instances, 
  on 
  Carboniferous 
  Limestone. 
  

   Throughout 
  the 
  whole 
  of 
  the 
  Cotteswolds 
  the 
  Humphriesianum-zone 
  

   is 
  absent 
  * 
  ; 
  the 
  ParJcinsoni-zone 
  (Upper 
  Trigonia-grit) 
  rests 
  upon 
  

   the 
  Concavum-zone 
  (Gryphite-grit), 
  but 
  in 
  many 
  parts 
  there 
  is 
  a 
  

   greater 
  hiatus 
  f 
  than 
  this. 
  Erom 
  Little 
  Sodbury 
  nearly 
  to 
  Stroud 
  

   the 
  Upper 
  Trigonia-grit 
  rests 
  upon 
  the 
  Freestone 
  or 
  Limestone 
  of 
  

   the 
  Murchisonai-zone, 
  and 
  there 
  is 
  a 
  lithologically 
  marked 
  hiatus. 
  

   In 
  the 
  eastern 
  extension 
  of 
  the 
  Cotteswolds, 
  namely, 
  at 
  Little 
  Eis- 
  

   sington, 
  near 
  Stow-on-the-Wold, 
  the 
  Clypeus-gv\t 
  (ParJcinsoni-zone) 
  

   rests 
  upon 
  the 
  Upper-Lias 
  Clay, 
  so 
  that 
  the 
  hiatus 
  is 
  now 
  very 
  

   great. 
  

  

  * 
  I 
  would 
  expressly 
  note, 
  in 
  passing, 
  that 
  I 
  am 
  pleased 
  to 
  think 
  my 
  views 
  

   upon 
  the 
  proper 
  position 
  of 
  the 
  Gryphite-grit 
  &c. 
  were 
  published 
  before 
  any- 
  

   thing 
  of 
  this 
  kind 
  had 
  been 
  thought 
  of, 
  at 
  any 
  rate 
  by 
  me 
  (Proc. 
  Cotteswold 
  

   Club, 
  vol. 
  ix. 
  1887), 
  so 
  that 
  it 
  cannot 
  be 
  said 
  that 
  such 
  Tiews 
  were 
  manufac- 
  

   tured 
  to 
  meet 
  the 
  exigencies 
  of 
  the 
  situation. 
  It 
  can, 
  however, 
  be 
  seen 
  how 
  

   extremely 
  important 
  such 
  views 
  have 
  become 
  in 
  connexion 
  with 
  the 
  present 
  

   ideas. 
  The 
  zonal 
  arrangements 
  of 
  the 
  Cotteswolds, 
  according 
  to 
  Dr. 
  Wright 
  

   and 
  Prof. 
  Judd, 
  whereby 
  the 
  Upper 
  Freestone 
  &c. 
  represented 
  the 
  Humphrie- 
  

   sianum-zone, 
  and 
  the 
  Oolite 
  Marl 
  the 
  Sowerbyi-zone, 
  would 
  have 
  greatly 
  in- 
  

   terfered 
  with 
  the 
  working-out 
  of 
  the 
  present 
  views. 
  

  

  t 
  In 
  the 
  North 
  Cotteswolds 
  this 
  hiatus 
  is 
  marked 
  lithologically 
  by 
  a 
  bored 
  

   bed 
  covered 
  with 
  oysters. 
  In 
  the 
  South 
  Cotteswolds 
  the 
  junction 
  of 
  the 
  Upper 
  

   Trigonia-grit 
  and 
  the 
  Gryphite-grit 
  is 
  not 
  so 
  distinguished 
  ; 
  but 
  this 
  is 
  paral- 
  

   leled 
  by 
  Castle 
  Cary 
  (p. 
  447). 
  At 
  the 
  same 
  time 
  there 
  is, 
  singularly 
  enough, 
  

   a 
  distinct 
  lithologically-marked 
  hiatus 
  in 
  this 
  district, 
  on 
  a 
  lower 
  horizon, 
  

   namely 
  at 
  the 
  top 
  of 
  the 
  Upper 
  Freestone 
  ; 
  but 
  this 
  hiatus 
  means 
  the 
  absence 
  

   of 
  the 
  Lower 
  Trigonia-grit 
  of 
  the 
  Cheltenham 
  district, 
  some 
  24 
  feet 
  of 
  strata. 
  

  

  Q. 
  J. 
  G. 
  S. 
  No. 
  179. 
  2 
  l 
  

  

  