﻿ASHPRINGTON 
  VOLCANIC 
  SERIES 
  OF 
  SOUTH 
  DEVON. 
  375 
  

  

  the 
  Trias 
  escarpment 
  of 
  Roundham 
  Head 
  follows. 
  In 
  fact 
  wherever 
  

   the 
  base 
  of 
  the 
  Paignton 
  Trias 
  is 
  found, 
  the 
  underlying 
  rock 
  is 
  the 
  

   same* 
  (Cockington 
  " 
  old 
  red 
  "), 
  only 
  to 
  the 
  east 
  of 
  the 
  Paignton 
  

   N.N.E. 
  fault 
  this 
  forms 
  low 
  depressed 
  ground, 
  instead 
  of 
  rising 
  into 
  

   bold 
  features 
  like 
  Windmill 
  Hill 
  and 
  Westerland 
  Beacon. 
  

  

  Thus, 
  when 
  once 
  in 
  No. 
  5 
  we 
  have 
  reached 
  a 
  clear 
  horizon, 
  

   [the 
  beds 
  of] 
  which 
  throughout 
  South 
  Devon, 
  including 
  the 
  Staddon 
  

   Point 
  and 
  Picklecombe 
  grits 
  in 
  Plymouth 
  Sound, 
  are 
  free 
  from 
  

   igneous 
  intercalations 
  ; 
  they 
  are 
  done 
  with. 
  

  

  Accordingly 
  the 
  chief 
  problem 
  consists 
  in 
  satisfactorily 
  piecing 
  

   together 
  the 
  Berry-Park 
  slaty 
  shales, 
  the 
  igneous 
  masses, 
  and 
  the 
  

   limestones 
  No. 
  1. 
  As 
  to 
  the 
  first, 
  which 
  extend 
  through 
  Little 
  

   Hempston 
  into 
  the 
  Dartington 
  trough, 
  it 
  is 
  improbable 
  that 
  they 
  

   are 
  represented 
  by 
  3, 
  4, 
  or 
  5 
  (which, 
  for 
  practical 
  purposes, 
  may 
  be 
  

   considered 
  one 
  group). 
  Apart 
  from 
  colours, 
  they 
  are 
  utterly 
  unlike 
  

   them, 
  and 
  descending 
  from 
  Windmill 
  Hill 
  to 
  the 
  Yalberton 
  lime- 
  

   stones, 
  not 
  a 
  vestige 
  of 
  the 
  Berry-Park 
  slates 
  is 
  to 
  be 
  seen, 
  only 
  the 
  

   strip 
  of 
  tuffs 
  as 
  described. 
  

  

  This 
  would 
  appear 
  to 
  point 
  to 
  an 
  unconformity 
  perhaps 
  between 
  

   2 
  and 
  3, 
  and 
  it 
  must 
  be 
  confessed 
  that 
  the 
  appearances 
  in 
  the 
  rail- 
  

   way-cutting 
  would 
  favour 
  this 
  hypothesis. 
  In 
  the 
  remaining 
  part 
  

   of 
  this 
  paper 
  we 
  shall 
  hope 
  to 
  throw 
  some 
  light 
  upon 
  these 
  rela- 
  

   tions. 
  

  

  The 
  Southern 
  Limits. 
  

  

  These 
  commence 
  at 
  Sharkham 
  Point 
  on 
  the 
  east, 
  but 
  the 
  igneous 
  

   series 
  is 
  not 
  conspicuously 
  developed 
  until 
  we 
  pass 
  the 
  Torquay 
  and 
  

   Dartmouth 
  road, 
  when 
  we 
  find 
  Brim 
  Hill 
  above 
  Galmpton 
  Mill 
  

   and 
  nearly 
  the 
  whole 
  of 
  Greenway 
  Hill 
  to 
  consist 
  of 
  them; 
  con- 
  

   tinuing 
  by 
  Dittisham 
  they 
  extend 
  to 
  East 
  Cornworthy, 
  where 
  they 
  

   are 
  shifted 
  to 
  the 
  north 
  by 
  a 
  fault. 
  From 
  the 
  bank 
  of 
  the 
  Dart, 
  

   near 
  a 
  barn 
  marked 
  on 
  the 
  map, 
  a 
  good 
  boundary 
  runs 
  right 
  along 
  

   the 
  village 
  of 
  Cornworthy, 
  by 
  Priory 
  Gate, 
  following 
  the 
  bottom 
  of 
  

   the 
  Washburton 
  valley 
  to 
  Middle 
  Washburton, 
  beyond 
  which 
  I 
  

   have 
  not 
  yet 
  satisfactorily 
  followed 
  itf. 
  This 
  last 
  trace 
  separates 
  

   dark-coloured 
  lavas 
  on 
  the 
  north 
  as 
  exposed 
  at 
  many 
  points 
  in 
  

   ground 
  which 
  is 
  often 
  deep 
  red 
  (due 
  to 
  causes 
  already 
  explained) 
  

   from 
  [the] 
  bluish-grey 
  slaty 
  shales 
  which 
  overlie 
  them 
  on 
  the 
  south 
  

   side. 
  

  

  At 
  the 
  south 
  end 
  of 
  Mudstone 
  beach 
  a 
  very 
  clear 
  passage 
  can 
  be 
  

   seen 
  from 
  the 
  grey 
  shales 
  into 
  the 
  superincumbent 
  limestone, 
  and 
  

   at 
  Sharkham 
  Point 
  the 
  limestone 
  beds 
  are 
  vertical, 
  and 
  parallel 
  

   with 
  them 
  is 
  a 
  sheet 
  of 
  compact 
  greenstone, 
  forming 
  the 
  point 
  of 
  

   the 
  headland. 
  

  

  I 
  spoke 
  of 
  this 
  as 
  intrusive, 
  but 
  have 
  since 
  seen 
  reason 
  to 
  doubt 
  

   the 
  correctness 
  of 
  this 
  opinion. 
  At 
  a 
  short 
  distance 
  west 
  a 
  steep 
  

  

  * 
  Dr. 
  Holl, 
  op. 
  At. 
  p. 
  434. 
  

  

  t 
  [On 
  Mr. 
  Champernowne's 
  map 
  the 
  boundary 
  is 
  shown 
  to 
  be 
  shifted 
  about 
  

   a 
  quarter 
  of 
  a 
  mile 
  to 
  ~N. 
  by 
  fault 
  at 
  Middle 
  Washburton, 
  and 
  carried 
  on 
  for 
  a 
  

   mile 
  on 
  south 
  side 
  of 
  Higher 
  Washburton 
  Houses. 
  — 
  A. 
  G\] 
  

  

  