﻿ASHPRINGTON 
  VOLCANIC 
  SERIES 
  OE 
  SOUTH 
  DEVON. 
  373 
  

  

  Beyond 
  the 
  great 
  fault 
  a 
  coarse 
  tuff 
  is 
  found 
  at 
  Ash, 
  thrown 
  on 
  the 
  

   east 
  against 
  some 
  beds 
  of 
  coarse 
  dolomite, 
  w 
  hich 
  contain 
  clear 
  quartz 
  

   and 
  lie 
  nearly 
  horizontally. 
  This 
  tuff 
  consists 
  chiefly 
  of 
  red 
  slaty- 
  

   looking 
  patches, 
  decomposed 
  felspar 
  crystals, 
  and 
  grains 
  of 
  quartz. 
  

   A 
  precisely 
  similar 
  rock 
  resting 
  on 
  limestone 
  occurs 
  near 
  Watton 
  

   [Waddeton] 
  village, 
  and 
  beds 
  of 
  like 
  constitution, 
  but 
  not 
  red, 
  are 
  

   intcrstratified 
  with 
  bluish 
  slaty 
  shales 
  over 
  the 
  Dartington 
  limestone, 
  

   being 
  well 
  exposed 
  in 
  the 
  Ashburton 
  railway-cutting, 
  also 
  overlying 
  

   the 
  limestone 
  of 
  Bulley 
  Barton, 
  and 
  south 
  of 
  the 
  limestone 
  of 
  

   Clennon 
  Hill 
  near 
  Goodrington, 
  where 
  it 
  would 
  appear 
  that 
  they 
  

   rest 
  on 
  an 
  uneven 
  surface. 
  These 
  belong 
  to 
  a 
  characteristic 
  type 
  

   not 
  specially 
  mentioned 
  in 
  the 
  first 
  part; 
  they 
  are 
  never 
  amygda- 
  

   loidal, 
  and 
  cannot 
  have 
  flowed, 
  but 
  seem 
  to 
  correspond 
  to 
  the 
  

   Nassau 
  " 
  porphyritic 
  schalstein 
  " 
  so-called. 
  

  

  The 
  next 
  exposure 
  east 
  of 
  Ash 
  occurs 
  in 
  the 
  lane 
  leading 
  from 
  

   Higher 
  Yalberton 
  to 
  Windmill 
  Hill, 
  but 
  it 
  throws 
  no 
  clear 
  light 
  on 
  

   the 
  relations. 
  Pine-grained 
  flaky 
  tuffs 
  forming 
  the 
  floor 
  of 
  the 
  

   lane 
  appear 
  to 
  dip 
  east, 
  and 
  just 
  before 
  reaching 
  the 
  purple 
  grits 
  of 
  

   the 
  high 
  ground 
  some 
  hard 
  aphanite 
  protrudes. 
  No 
  junctions 
  are 
  

   visible 
  here. 
  

  

  On 
  the 
  east 
  of 
  Higher 
  Yalberton 
  the 
  limestone 
  forms 
  a 
  narrow 
  

   crest 
  broken 
  by 
  two 
  faults, 
  but 
  otherwise 
  continuous 
  with 
  that 
  of 
  

   Clennon 
  Hill 
  over 
  Goodrington 
  Marshes, 
  where 
  it 
  abruptly 
  ceases 
  

   on 
  its 
  strike, 
  but 
  can 
  be 
  followed 
  across 
  the 
  narrow 
  gorge 
  on 
  the 
  

   south 
  as 
  far 
  as 
  the 
  Brixham 
  highroad 
  near 
  Crabb's 
  Park. 
  Here 
  for 
  

   a 
  few 
  chains 
  it 
  is 
  in 
  contact 
  with 
  the 
  mass 
  extending 
  towards 
  

   Watton 
  village, 
  which 
  has 
  the 
  volcanic 
  rocks 
  dipping 
  against 
  it 
  on 
  

   the 
  west. 
  Clennon 
  Hill 
  is 
  bounded 
  on 
  the 
  east 
  by 
  a 
  fault 
  bearing 
  

   N.jNLE. 
  through 
  Paignton, 
  which 
  is 
  very 
  conspicuous 
  from 
  its 
  shift- 
  

   ing 
  the 
  Triassic 
  boundary 
  nearly 
  half 
  a 
  mile 
  to 
  the 
  south 
  from 
  the 
  

   east 
  end 
  of 
  Primley 
  Hill. 
  It 
  passes 
  just 
  east 
  of 
  Crabb's 
  Park, 
  

   throwing 
  down 
  slaty 
  shales 
  and 
  grits, 
  and 
  after 
  bringing 
  limestone 
  

   against 
  limestone, 
  as 
  mentioned 
  (a 
  point 
  of 
  minimum 
  " 
  throw 
  "), 
  

   sets 
  on 
  again 
  with 
  an 
  opposite 
  throw 
  following 
  the 
  line 
  of 
  the 
  

   Watton 
  road, 
  and 
  comes 
  out 
  on 
  the 
  bank 
  of 
  the 
  Dart, 
  a 
  short 
  dis- 
  

   tance 
  west 
  of 
  the 
  Watton 
  boat-house, 
  bringing 
  down 
  the 
  raddled 
  

   volcanic 
  rocks 
  on 
  the 
  west 
  against 
  grey 
  and 
  purplish 
  slates 
  that 
  dip 
  

   under 
  the 
  Watton 
  limestone, 
  the 
  dips 
  at 
  the 
  junction 
  being 
  widely 
  

   divergent. 
  To 
  complete 
  this 
  bit 
  of 
  ground, 
  we 
  recross 
  north-west 
  

   from 
  the 
  Watton 
  and 
  Paignton 
  road 
  to 
  Higher 
  Yalberton, 
  and 
  find 
  all 
  

   the 
  intervening 
  ground 
  to 
  consist 
  of 
  the 
  trappean 
  rocks, 
  the 
  narrow 
  

   crest 
  of 
  limestone 
  east 
  of 
  that 
  place 
  clearly 
  dipping 
  south 
  under 
  it. 
  

   The 
  north 
  side 
  of 
  this 
  crest 
  is 
  much 
  more 
  obscure 
  in 
  its 
  relations 
  

   than 
  the 
  south, 
  and 
  the 
  same 
  remark 
  applies 
  to 
  that 
  of 
  Clennon 
  

   Hill. 
  Dr. 
  Holl 
  considered 
  it 
  to 
  be 
  " 
  doubled 
  under 
  " 
  higher 
  rocks 
  

   " 
  with 
  inverted 
  dip 
  " 
  *. 
  I 
  do 
  not 
  feel 
  satisfied 
  on 
  this 
  point. 
  A 
  

   patch 
  of 
  limestone 
  shown 
  on 
  the 
  old 
  map 
  south 
  of 
  Goodrington 
  

   marshes 
  must 
  be 
  expunged, 
  as 
  the 
  ground 
  consists 
  of 
  slates 
  and 
  

   grits. 
  There 
  are 
  other 
  faults 
  shown 
  on 
  the 
  map, 
  but 
  not 
  described. 
  

   * 
  Op. 
  cit. 
  p. 
  431. 
  

  

  