﻿Vol. 
  53-] 
  DEPOSITS 
  OF 
  THE 
  CLEEVE 
  HILL 
  PLATEAU. 
  613 
  

  

  (77) 
  The 
  Witchellia-grit. 
  

  

  This 
  bed 
  may 
  be 
  seen 
  in 
  connexion 
  with 
  overlying 
  beds 
  at 
  the 
  

   southern 
  end 
  of 
  the 
  Rolling 
  Bank 
  quarry, 
  but 
  the 
  tumbled 
  and 
  much- 
  

   inclined 
  condition 
  of 
  the 
  strata 
  makes 
  exact 
  measurement 
  difficult. 
  

   Its 
  general 
  relation 
  to 
  the 
  overlying 
  strata 
  may 
  also 
  be 
  seen 
  in 
  the 
  

   quarries 
  east 
  of 
  the 
  Rolling 
  Bank 
  on 
  the 
  same 
  line 
  of 
  fault. 
  

  

  The 
  bed 
  is 
  similar 
  to 
  the 
  deposit 
  described 
  at 
  Cold 
  Comfort, 
  1 
  

   perhaps 
  rather 
  more 
  ironshot. 
  It 
  has 
  yielded 
  characteristic 
  fossils, 
  

   namely 
  : 
  Terebratula 
  Wrighti, 
  an 
  Acanthoihyris, 
  and 
  species 
  of 
  

   Witchellia, 
  all 
  of 
  which 
  identify 
  it 
  with 
  the 
  Cold 
  Comfort 
  deposit. 
  

   The 
  exact 
  thickness 
  of 
  this 
  grit 
  is 
  not 
  yet 
  ascertainable. 
  

  

  (0) 
  The 
  Bourguetia- 
  and 
  Terebratula 
  Phillipsiana-be&s. 
  

  

  These 
  beds 
  form 
  the 
  particularly 
  interesting 
  feature 
  of 
  the 
  Cleeve 
  

   Hill 
  plateau, 
  and 
  the 
  recognition 
  of 
  their 
  true 
  position 
  is 
  the 
  most 
  

   important 
  point 
  in 
  the 
  geology 
  of 
  the 
  district 
  (see 
  Diagr. 
  I, 
  p. 
  614). 
  

   These 
  deposits 
  are 
  not 
  found 
  on 
  the 
  southern 
  side 
  of 
  the 
  Chelt 
  Valley, 
  

   for 
  instance 
  at 
  Cold 
  Comfort, 
  and 
  there 
  is 
  considerable 
  justification 
  

   for 
  the 
  statement 
  that 
  they 
  are 
  not 
  to 
  be 
  found 
  anywhere 
  else 
  

   in 
  the 
  Cotteswolds, 
  except 
  upon 
  the 
  Cleeve 
  Hill 
  plateau. 
  Therefore, 
  

   as 
  the 
  Cotteswold 
  rocks 
  have 
  particular 
  characters 
  of 
  their 
  own, 
  

   and 
  a 
  somewhat 
  special 
  fauna, 
  because 
  they 
  were 
  deposited 
  in 
  

   an 
  area 
  which 
  had 
  somewhat 
  imperfect 
  connexion 
  with 
  other 
  areas 
  

   of 
  the 
  same 
  date, 
  it 
  may 
  be 
  said 
  that 
  many 
  of 
  the 
  fossils 
  which 
  the 
  

   Bourguetia- 
  and 
  Phillipsiana-be&s 
  yield 
  are 
  not 
  to 
  be 
  found 
  any- 
  

   where 
  else 
  except 
  upon 
  the 
  Cleeve 
  Hill 
  plateau. 
  The 
  Bourguetia- 
  

   beds 
  are 
  to 
  be 
  distinguished 
  from 
  the 
  Phillipsiana-be&s 
  by 
  a 
  

   difference 
  of 
  matrix. 
  They 
  yield 
  numerous 
  species 
  of 
  unusually 
  large 
  

   lamellibranchiata, 
  and 
  broken 
  specimens 
  of 
  a 
  large 
  Bourguetia 
  are 
  not 
  

   uncommon. 
  One 
  Stephanoceras 
  has 
  been 
  obtained 
  (p. 
  609, 
  footnote). 
  

  

  The 
  Phillip 
  siana-he&s 
  are 
  easily 
  recognized 
  by 
  their 
  bluish 
  sandy 
  

   matrix. 
  They 
  yield 
  chiefly 
  species 
  of 
  brachiopoda, 
  namely 
  : 
  Tere- 
  

   bratula 
  Phillipsiana, 
  T. 
  BucJcmaniana, 
  a 
  Zeilleria 
  cf. 
  LecJcenbyi, 
  and 
  

   an 
  Acanthoihyris. 
  The 
  Upper 
  Trigonia-grit 
  lies 
  non-sequentially 
  

   upon 
  the 
  Phillipsiana-'be&s, 
  because 
  their 
  top 
  is 
  considerably 
  bored 
  ; 
  

   moreover, 
  the 
  boring 
  must 
  have 
  taken 
  place 
  after 
  the 
  beds 
  had 
  

   consolidated 
  to 
  become 
  as 
  hard 
  as 
  their 
  contained 
  shells, 
  because 
  

   the 
  bore-tubes 
  pass 
  through 
  stone 
  or 
  shell 
  with 
  equal 
  indifference. 
  

  

  The 
  date 
  of 
  the 
  Phillipsiana- 
  and 
  Bourguetia-be&s 
  is 
  probably 
  the 
  

   Sauzei 
  hemera. 
  The 
  Stephanoceras 
  obtained 
  agrees 
  closely 
  with 
  

   species 
  of 
  this 
  date 
  from 
  Dundry 
  and 
  Dorset. 
  It 
  is 
  presumable 
  

   that 
  the 
  Phillipsiana-beds 
  do 
  not 
  represent 
  any 
  part 
  of 
  the 
  Hum- 
  

   phriesianum-zone, 
  and 
  that 
  therefore 
  the 
  non-sequence 
  between 
  

   these 
  beds 
  and 
  the 
  Upper 
  Trigonia-grit 
  was 
  occasioned 
  by 
  denuda- 
  

   tion 
  during 
  the 
  hemerae 
  of 
  Humphriesianus 
  and 
  niortensis 
  — 
  that 
  at 
  

   any 
  rate 
  there 
  are, 
  at 
  Cleeve 
  Hill, 
  no 
  remains 
  of 
  any 
  deposits 
  

   laid 
  down 
  during 
  one 
  or 
  both 
  hemerae. 
  

  

  1 
  ' 
  Mid-Cotteswolds/ 
  p. 
  417. 
  

  

  