﻿Vol. 
  53'] 
  DEPOSITS 
  OP 
  THE 
  CLEEVE 
  HILL 
  PLATEAU. 
  623 
  

  

  2. 
  Indirect 
  evidence. 
  Not 
  all 
  the 
  possible 
  sections 
  which 
  might 
  

   be 
  constructed 
  have 
  been 
  examined 
  ; 
  but, 
  as 
  an 
  instance, 
  the 
  

   course 
  of 
  the 
  Witc7iellia-grit-\ir\e 
  towards 
  Cheltenham 
  may 
  be 
  

   quoted. 
  This 
  is 
  on 
  the 
  evidence 
  of 
  the 
  section 
  from 
  Leckhampton 
  

   to 
  Cleeve. 
  

  

  3. 
  Inference. 
  The 
  south-easterly 
  extension 
  of 
  the 
  Witcliellia- 
  

   grit-line 
  is 
  based 
  on 
  the 
  idea 
  of 
  parallelism 
  with 
  the 
  known 
  ex- 
  

   tension 
  of 
  Notgrove 
  Freestone. 
  The 
  north-easterly 
  curvature 
  of 
  

   the 
  Oolite-Marl 
  line 
  towards 
  Birdlip 
  is 
  based 
  partly 
  on 
  the 
  same 
  

   idea 
  of 
  parallelism, 
  partly 
  on 
  the 
  fact 
  that 
  the 
  Upper 
  Trigonia-grit 
  

   is 
  close 
  to 
  the 
  Terebratula 
  fimbria-M&Q 
  at 
  Cranham 
  "Wood 
  and 
  at 
  

   Bull 
  Bank, 
  by 
  Miserden, 
  

  

  The 
  assumed 
  courses 
  across 
  the 
  vale 
  are 
  shown 
  by 
  dotted 
  lines, 
  1 
  

   but 
  all 
  the 
  lines 
  on 
  the 
  map 
  are 
  to 
  be 
  regarded 
  as 
  approximative. 
  

   Further 
  exploration 
  of 
  the 
  country 
  will 
  no 
  doubt 
  show 
  the 
  necessity 
  

   for 
  some 
  modification 
  of 
  the 
  lines, 
  and 
  considering 
  the 
  nature 
  

   of 
  the 
  task, 
  with 
  the 
  difficulty 
  of 
  rinding 
  suitable 
  exposures, 
  this 
  

   may 
  be 
  reasonably 
  expected. 
  Such 
  alteration 
  in 
  the 
  matter 
  of 
  details 
  

   will 
  not, 
  however, 
  be 
  really 
  important, 
  in 
  regard 
  to 
  the 
  general 
  view 
  

   which 
  the 
  map 
  affords 
  of 
  the 
  distribution 
  of 
  the 
  rocks 
  upon 
  which 
  

   the 
  Upper 
  Trigonia-grit 
  rests. 
  It 
  may 
  be 
  confessed 
  that 
  the 
  line 
  

   which 
  is 
  most 
  speculative 
  is 
  the 
  boundary-line 
  of 
  the 
  Oolite 
  Marl 
  ; 
  

   but 
  the 
  evidence 
  upon 
  which 
  it 
  is 
  drawn 
  is 
  given 
  in 
  the 
  map. 
  

  

  The 
  attempt 
  to 
  construct 
  this 
  map 
  shows 
  how 
  very 
  much 
  there 
  

   is 
  yet 
  to 
  be 
  learnt 
  concerning 
  the 
  geology 
  of 
  the 
  Cotteswolds. 
  

   Particularly 
  is 
  this 
  the 
  case 
  with 
  the 
  large 
  stretch 
  of 
  country 
  

   north-east 
  of 
  Cleeve 
  Hill 
  and 
  north 
  of 
  the 
  Banbury 
  & 
  Cheltenham 
  

   Kailway. 
  Of 
  this 
  country 
  we 
  have 
  very 
  few 
  details 
  — 
  practically 
  

   no 
  more 
  than 
  an 
  outline. 
  For 
  this 
  reason 
  I 
  could 
  make 
  no 
  attempt 
  

   to 
  map 
  it 
  with 
  reference 
  to 
  the 
  Bajocian 
  denudation. 
  But 
  probably 
  

   another 
  reason 
  will 
  prevent 
  any 
  such 
  map 
  from 
  being 
  constructed 
  

   in 
  detail, 
  and 
  that 
  is 
  the 
  greater 
  removal 
  of 
  the 
  Upper 
  Trigonia- 
  

   grit 
  by 
  recent 
  denudation 
  — 
  the 
  farther 
  north 
  they 
  are 
  the 
  more 
  

   have 
  the 
  ' 
  upper 
  beds 
  ' 
  suffered. 
  

  

  VIII. 
  Denudation 
  and 
  Overlap. 
  

  

  A 
  noticeable 
  distinction 
  may 
  be 
  drawn 
  between 
  the 
  cause 
  of 
  the 
  

   absence 
  of 
  the 
  lower 
  Bagstones 
  — 
  the 
  Lower 
  Trigonia- 
  and 
  Gryphite- 
  

   grits 
  — 
  from 
  the 
  Birdlip 
  district, 
  and 
  the 
  absence 
  of 
  the 
  Harford 
  

   Sands 
  and 
  Snowshill 
  Clay 
  south 
  of 
  Leckhampton. 
  The 
  former 
  is 
  

   due 
  to 
  denudation, 
  the 
  latter 
  is 
  due 
  to 
  absence 
  of 
  deposit. 
  In 
  the 
  

   former 
  case, 
  coming 
  either 
  from 
  north 
  or 
  south 
  towards 
  Birdlip 
  it 
  is 
  

   found 
  that 
  always 
  the 
  upper 
  stratum 
  is 
  removed 
  while 
  the 
  surface 
  

   of 
  the 
  bed 
  which 
  may 
  be 
  present 
  exhibits 
  borings 
  and 
  signs 
  of 
  

   erosion. 
  This 
  is 
  illustrated 
  in 
  the 
  following 
  diagram 
  : 
  — 
  

  

  1 
  The 
  irregular 
  line 
  de.iotes 
  the 
  edge 
  of 
  the 
  Cotteswold 
  escarpment. 
  

  

  