﻿622 
  ME. 
  S. 
  S. 
  BUCKMAN 
  ON 
  THE 
  DAJOCIAN 
  [DeC. 
  1 
  89 
  7, 
  

  

  A 
  map 
  (PL 
  XL 
  VI) 
  has 
  been 
  constructed 
  to 
  show 
  over 
  what 
  portions 
  

   of 
  Cotteswold 
  country 
  the 
  Upper 
  Trigonia-grit 
  comes 
  into 
  actual 
  

   contact 
  with 
  particular 
  rocks. 
  The 
  lines 
  which 
  are 
  drawn 
  upon 
  

   the 
  map 
  give, 
  so 
  far 
  as 
  evidence 
  and 
  justifiable 
  supposition 
  may 
  

   indicate, 
  the 
  limits 
  of 
  each 
  particular 
  rock, 
  so 
  that 
  the 
  lowest 
  

   boundary-line 
  defines 
  where 
  the 
  last 
  trace 
  of 
  a 
  particular 
  bed 
  is 
  

   found 
  beneath 
  the 
  Upper 
  Trigonia-grit. 
  It 
  will 
  be 
  seen 
  that 
  with 
  

   a 
  little 
  exception, 
  in 
  passing 
  from 
  west 
  to 
  east, 
  the 
  Upper 
  Trigonia- 
  

   grit 
  rests 
  successively 
  upon 
  the 
  strata 
  from 
  the 
  Phillipsiana-beds 
  

   to 
  the 
  Oolite 
  Marl 
  1 
  — 
  the 
  outer 
  line 
  marking 
  what 
  is 
  presumed 
  to 
  

   be 
  the 
  extreme 
  boundary 
  of 
  the 
  Oolite 
  Marl. 
  

  

  The 
  reasons 
  which 
  have 
  led 
  to 
  the 
  drawing 
  of 
  the 
  boundary-lines 
  

   in 
  the 
  present 
  positions 
  may 
  be 
  briefly 
  stated 
  as 
  follows 
  : 
  — 
  

  

  1. 
  Direct 
  evidence, 
  furnished 
  by 
  actual 
  exposures. 
  

  

  2. 
  Indirect 
  evidence, 
  such 
  as 
  may 
  be 
  obtained 
  by 
  constructing 
  

  

  diagrams 
  from 
  the 
  exposures 
  of 
  various 
  localities 
  (see 
  

   Diagr. 
  IV 
  of 
  this 
  paper, 
  p. 
  621, 
  and 
  that 
  given 
  in 
  ' 
  The 
  

   Bajocian 
  of 
  the 
  Mid-Cotteswolds,' 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

   vol. 
  li. 
  1895, 
  p. 
  430, 
  table 
  vi). 
  

  

  3. 
  Inference, 
  — 
  that 
  there 
  would 
  be 
  more 
  or 
  less 
  of 
  a 
  parallelism 
  

  

  between 
  the 
  courses 
  of 
  the 
  different 
  lines, 
  so 
  that 
  an 
  un- 
  

   known 
  contour 
  of 
  one 
  may 
  be 
  approximately 
  determined 
  

   from 
  a 
  known 
  contour 
  of 
  another. 
  

  

  1. 
  The 
  direct 
  evidence 
  speaks 
  for 
  itself; 
  and 
  the 
  actual 
  

   expos 
  iires 
  are 
  marked 
  in 
  the 
  map, 
  with 
  the 
  name 
  of 
  the 
  bed 
  upon 
  

   which 
  the 
  Upper 
  Trigonia-grit 
  rests, 
  except 
  in 
  certain 
  cases 
  enclosed 
  

   in 
  brackets 
  where 
  the 
  actual 
  contact 
  has 
  not 
  been 
  recorded, 
  as, 
  for 
  

   example, 
  Edgeworth. 
  The 
  actual 
  exposures 
  observed 
  are 
  recorded 
  

   upon 
  my 
  own 
  authority 
  ; 
  but 
  the 
  following 
  notes 
  have 
  also 
  been 
  

   considered 
  ; 
  they 
  are 
  recorded 
  in 
  the 
  map 
  in 
  inverted 
  commas 
  : 
  — 
  

  

  1857. 
  Ltcett, 
  < 
  Cotteswold 
  Hills.' 
  Thin 
  band 
  of 
  Oolite 
  Marl 
  

   beneath 
  upper 
  ragstones 
  at 
  Ball's 
  Green, 
  near 
  JSTailsworth, 
  p. 
  50. 
  

  

  1857. 
  Hull, 
  < 
  Geology 
  of 
  the 
  Country 
  round 
  Cheltenham. 
  ' 
  

   Ragstone 
  on 
  Oolite 
  Marl, 
  Turkdean, 
  p. 
  38. 
  Eagstone 
  on 
  Freestone, 
  

   5 
  feet 
  from 
  Upper 
  Lias 
  at 
  Sherborne, 
  p. 
  40. 
  Ragstone 
  on 
  Upper 
  

   Lias 
  at 
  Stow, 
  Rissington, 
  and 
  Burford, 
  pp. 
  40 
  and 
  47. 
  Oolite 
  Marl 
  

   at 
  Condicote, 
  p. 
  37. 
  

  

  1870. 
  J. 
  H. 
  Taunton. 
  Sapperton 
  Tunnel 
  ; 
  Proc. 
  Cotteswold 
  Nat. 
  

   Field 
  Club, 
  vol. 
  v. 
  p. 
  268, 
  — 
  records 
  the 
  find 
  of 
  Terebratula 
  fimbria. 
  

  

  1894. 
  H.B. 
  Wood 
  ward, 
  ' 
  Lower 
  Oolitic 
  Rocks 
  of 
  England,' 
  Mem. 
  

   Geol. 
  Surv. 
  : 
  Jurassic 
  Rocks, 
  vol. 
  iv. 
  Oolite 
  Marl 
  at 
  Yanworth 
  

   Common, 
  p. 
  127; 
  Harford 
  Sands 
  atBourton 
  Clump, 
  p. 
  143 
  ; 
  Gryphite- 
  

   grit 
  [? 
  Lower 
  Trigonia-grit] 
  and 
  Harford 
  Sands, 
  east 
  of 
  Stanway 
  

   Hill 
  Barn, 
  p. 
  137 
  ; 
  Oolite 
  Marl 
  west 
  of 
  Blockley, 
  p. 
  141. 
  

  

  C. 
  Upton, 
  information 
  ; 
  — 
  Upper 
  Trigonia-grit 
  on 
  Oolite 
  Marl 
  by 
  

   roadside 
  near 
  Long 
  Wood, 
  between 
  Selsley 
  and 
  Nympsfield. 
  

  

  1 
  It 
  also 
  rests 
  on 
  lower 
  rocks 
  ; 
  but 
  their 
  limit3 
  have 
  not 
  been 
  attempted 
  in 
  

   the 
  present 
  case. 
  

  

  