﻿Vol. 
  53.] 
  ASSOCIATED 
  BEDS, 
  IN 
  N. 
  DEVON 
  AND 
  W. 
  SOMEESET. 
  443' 
  

  

  slates 
  of 
  Oakhampton 
  and 
  Combe 
  until 
  we 
  searched 
  them 
  in 
  the- 
  

   summer 
  of 
  1895, 
  but 
  in 
  that 
  year 
  and 
  afterwards 
  we 
  discovered 
  

   several 
  important 
  fossils 
  in 
  the 
  slates, 
  and 
  these 
  have 
  now 
  enabled 
  

   us 
  to 
  fix 
  the 
  horizon 
  of 
  the 
  beds 
  with 
  tolerable 
  accuracy. 
  One 
  of 
  

   the 
  most 
  important 
  fossils 
  discovered 
  is 
  Cryphceus 
  laciniatus, 
  a 
  

   characteristic 
  Lower 
  Devonian 
  fossil 
  both 
  in 
  Europe 
  and 
  America. 
  

   The 
  fossils 
  defined 
  by 
  Mr. 
  Whidborne 
  are 
  : 
  — 
  Cryphceus 
  laciniatus, 
  

   F. 
  Eomer, 
  Limoptera 
  semiradiata, 
  Freeh 
  ?, 
  Aviculopecten 
  mundus 
  r 
  

   sp. 
  nov., 
  Spirifera 
  sp., 
  Rhynclionella 
  Jiercynica, 
  Kayser?, 
  llh. 
  nympha, 
  

   Barrande 
  ?, 
  Stropheodonta 
  tceniolata, 
  Sandberg., 
  sp., 
  and 
  crinoid 
  

   remains. 
  

  

  In 
  the 
  section 
  (fig. 
  2, 
  p. 
  439) 
  it 
  will 
  be 
  seen 
  that 
  the 
  beds 
  at 
  

   Whitfield, 
  near 
  the 
  Combe 
  quarries, 
  are 
  at 
  a 
  very 
  high 
  angle, 
  and 
  dip 
  

   to 
  the 
  south. 
  A 
  like 
  dip 
  can 
  be 
  traced 
  in 
  the 
  ravine 
  which 
  separates 
  

   these 
  quarries 
  from 
  the 
  Oakhampton 
  quarries 
  for 
  1| 
  mile 
  to 
  the 
  

   north 
  ; 
  but 
  there 
  are 
  indications 
  of 
  several 
  folds 
  in 
  the 
  beds. 
  Between 
  

   that 
  point 
  and 
  the 
  Brendon 
  Hill 
  Beds 
  the 
  exposures 
  are 
  less 
  clear, 
  

   though 
  there 
  is 
  no 
  marked 
  change 
  in 
  the 
  character 
  of 
  the 
  sediments.. 
  

   The 
  few 
  fossils 
  obtained 
  from 
  the 
  Combe 
  quarries 
  agree 
  with 
  those 
  

   found 
  at 
  Oakhampton 
  Quarry, 
  and 
  up 
  to 
  the 
  present 
  no 
  other 
  well- 
  

   marked 
  zone 
  of 
  fossils 
  has 
  been 
  found 
  in 
  this 
  area. 
  The 
  beds 
  

   in 
  places 
  certainly 
  resemble 
  some 
  of 
  the 
  Morte 
  Slates 
  of 
  North 
  

   Devon, 
  but 
  they 
  are, 
  on 
  the 
  whole, 
  of 
  a 
  darker 
  colour 
  and 
  less 
  hard.. 
  

   They 
  are 
  also 
  much 
  less 
  crushed, 
  and 
  the 
  cleavage 
  is 
  nearly 
  in 
  the 
  

   line 
  of 
  the 
  bedding. 
  Slaty 
  beds 
  can 
  be 
  traced 
  continuously 
  in 
  a 
  

   westerly 
  direction 
  from 
  here 
  to 
  near 
  Dulverton 
  in 
  the 
  Exe 
  Valley, 
  

   but 
  up 
  to 
  the 
  present 
  they 
  have 
  not 
  yielded 
  any 
  fossils 
  in 
  that 
  area. 
  

   The 
  evidence 
  seems 
  to 
  point 
  to 
  an 
  extension 
  of 
  the 
  fault 
  from 
  

   Langley 
  Marsh 
  to 
  the 
  Exe 
  Valley, 
  marking 
  the 
  boundary 
  between 
  

   the 
  Pickwell 
  Down 
  Beds 
  and 
  the 
  so-called 
  Morte 
  Slates. 
  The 
  

   Pickwell 
  Down 
  Beds, 
  however, 
  frequently 
  dip 
  at 
  a 
  low 
  angle, 
  and 
  

   are 
  repeated 
  in 
  several 
  folds 
  to 
  the 
  south. 
  Resting 
  upon 
  them 
  are 
  

   beds 
  resembling 
  in 
  a 
  marked 
  manner 
  the 
  Sloly 
  Beds 
  near 
  Barnstaple, 
  

   and 
  upon 
  the 
  latter 
  occur 
  Pilton 
  Beds 
  full 
  of 
  the 
  usually 
  charac- 
  

   teristic 
  fossils. 
  The 
  Pilton 
  Beds 
  also 
  are 
  repeated 
  in 
  several 
  folds, 
  and 
  

   they 
  can 
  be 
  examined 
  in 
  various 
  quarries 
  in 
  the 
  Tone 
  Valley 
  west 
  

   of 
  Wiveliscombe. 
  These 
  beds 
  have 
  been 
  well 
  described 
  in 
  the 
  paper 
  

   by 
  Messrs. 
  Champernowne 
  & 
  Ussher 
  in 
  this 
  Journal, 
  vol. 
  xxxv. 
  

   (1879) 
  p. 
  542. 
  Farther 
  south 
  the 
  Pilton 
  Beds 
  are 
  succeeded 
  by 
  the 
  

   Culm 
  Measures, 
  with, 
  chert-bands, 
  as 
  in 
  North 
  Devon. 
  

  

  V. 
  General 
  Conclusions. 
  

  

  It 
  has 
  now 
  been 
  shown 
  that 
  the 
  so-called 
  Morte 
  Slates 
  of 
  North 
  

   Devon 
  and 
  West 
  Somerset, 
  which, 
  up 
  to 
  the 
  time 
  when 
  we 
  com- 
  

   menced 
  our 
  researches 
  among 
  them, 
  were 
  always 
  considered 
  to 
  be 
  

   barren 
  of 
  organic 
  remains, 
  contain 
  several 
  zones 
  of 
  fossils, 
  and 
  that 
  

   beds 
  of 
  very 
  different 
  horizons 
  have 
  been 
  included 
  under 
  that 
  term. 
  

   In 
  North 
  Devon 
  evidence 
  has 
  been 
  brought 
  forward 
  to 
  show 
  that 
  

   some 
  of 
  the 
  beds 
  are 
  of 
  Silurian 
  age, 
  as 
  the 
  fossils 
  arc 
  unlike 
  any 
  

  

  