﻿370 
  THE 
  LATE 
  MR. 
  A. 
  CHAMP 
  EENOWNE 
  ON 
  THE 
  

  

  less 
  expanded 
  than 
  on 
  the 
  east 
  of 
  that 
  river, 
  partaking 
  of 
  the 
  

   narrow 
  folds 
  into 
  which 
  the 
  country 
  is 
  thrown 
  immediately 
  south 
  

   of 
  the 
  granite. 
  To 
  the 
  north 
  of 
  the 
  parallel 
  of 
  Paignton 
  and 
  Brent 
  

   they 
  nowhere 
  occupy 
  a 
  large 
  continuous 
  area 
  ; 
  nevertheless 
  various 
  

   tuffs 
  seen 
  in 
  the 
  Dartington, 
  Kingskerswell, 
  and 
  Ogwell 
  districts 
  ought 
  

   probably 
  to 
  be 
  placed 
  in 
  the 
  same 
  category 
  from 
  their 
  relations 
  to 
  

   Devonian 
  limestones, 
  although 
  not 
  attaining 
  the 
  development 
  that 
  

   the 
  series 
  exhibits 
  on 
  the 
  banks 
  of 
  the 
  Dart. 
  Lavas, 
  frequently 
  

   amygdaloidal 
  and 
  vesicular, 
  or 
  even 
  scoriaceous, 
  but 
  at 
  other 
  times 
  

   very 
  compact 
  or 
  aphanitic, 
  constitute 
  a 
  great 
  part 
  of 
  this 
  series. 
  

   They 
  are 
  either 
  altered 
  porphyrites, 
  or 
  basalts, 
  or 
  both. 
  Tuff-beds 
  

   are 
  largely 
  intermingled 
  with 
  them, 
  all 
  these 
  rocks 
  being 
  highly 
  

   basic 
  in 
  character. 
  It 
  is 
  possible 
  that 
  some 
  beds 
  of 
  purely 
  detrital 
  

   origin 
  may 
  be 
  here 
  and 
  there 
  interbedded 
  (if 
  not 
  doubled 
  in), 
  but, 
  

   so 
  long 
  as 
  we 
  have 
  only 
  the 
  imperfect 
  one-inch 
  maps, 
  they 
  are 
  too 
  

   insignificant 
  to 
  be 
  shown 
  on 
  paper. 
  Some 
  reddish 
  schists, 
  for 
  ex- 
  

   ample, 
  are 
  met. 
  with 
  in 
  a 
  road 
  descending 
  from 
  Weston 
  within 
  a 
  

   mile 
  east 
  of 
  Totnes 
  to 
  the 
  head 
  of 
  the 
  valley 
  leading 
  down 
  to 
  Pleet 
  

   Mill. 
  

  

  The 
  lavas, 
  where 
  freshest, 
  are 
  usually 
  of 
  a 
  blackish-green 
  colour, 
  

   often 
  porphyritic 
  in 
  structure, 
  from 
  the 
  presence 
  of 
  crystals 
  of 
  felspar, 
  

   which 
  sometimes 
  in 
  hand 
  specimens 
  appear 
  as 
  dark 
  as 
  the 
  ground- 
  

   mass. 
  These 
  harder 
  rocks 
  appear 
  to 
  run 
  in 
  lines, 
  and 
  have 
  even 
  

   been 
  represented 
  as 
  dykes 
  on 
  the 
  map, 
  as, 
  for 
  instance, 
  at 
  Sharpham 
  

   on 
  the 
  Dart, 
  but 
  they 
  dip 
  with 
  the 
  rocks 
  among 
  which 
  they 
  occur, 
  

   and 
  even 
  pass 
  into 
  them. 
  It 
  is 
  true 
  they 
  form 
  projecting 
  bosses 
  by 
  

   the 
  river-bank, 
  but 
  it 
  would 
  be 
  impossible 
  to 
  trace 
  them 
  away 
  from 
  

   the 
  foreshore. 
  I 
  believe 
  they 
  are 
  not 
  dykes, 
  but 
  are 
  simply 
  inter- 
  

   calated, 
  and 
  I 
  know 
  of 
  no 
  single 
  instance 
  of 
  a 
  line 
  of 
  hard 
  rock 
  

   cutting 
  across 
  the 
  strike. 
  

  

  Sometimes 
  the 
  lavas 
  become 
  flaggy, 
  breaking 
  into 
  irregular, 
  long, 
  

   wedge-like 
  flags, 
  weathering 
  brown 
  or 
  purplish 
  near 
  the 
  surface, 
  

   and 
  even 
  splitting 
  up 
  into 
  a 
  shaly 
  substance, 
  from 
  which, 
  neverthe- 
  

   less, 
  a 
  perfect 
  passage 
  can 
  be 
  traced 
  into 
  the 
  compact, 
  dark 
  rock 
  

   used 
  for 
  road-metal 
  ; 
  and 
  these 
  facts 
  can 
  be 
  observed 
  in 
  one 
  and 
  

   the 
  same 
  quarry, 
  as, 
  for 
  instance, 
  in 
  a 
  quarry 
  by 
  the 
  roadside 
  on 
  

   Totnes 
  Down 
  Hill. 
  

  

  A 
  mass 
  of 
  this 
  rock 
  at 
  " 
  Bed 
  Hill" 
  or 
  Pheasant's 
  Hill 
  quarry, 
  

   Totnes, 
  where 
  it 
  rests 
  on 
  limestone, 
  as 
  further 
  to 
  be 
  described, 
  is 
  

   weathered 
  brown 
  on 
  one 
  side, 
  but 
  abruptly 
  changes 
  its 
  colour 
  to 
  a 
  

   deep 
  red 
  on 
  the 
  other, 
  where 
  I 
  noticed 
  a 
  knob 
  of 
  limestone, 
  imme- 
  

   diately 
  under 
  the 
  " 
  trap," 
  coated 
  with 
  a 
  thin 
  film 
  of 
  haematite. 
  

  

  In 
  a 
  plantation 
  above 
  Sharpham 
  Lodge, 
  near 
  Totnes, 
  the 
  rock 
  is 
  

   amygdaloidal, 
  as 
  often 
  happens, 
  the 
  cavities 
  being 
  filled 
  with 
  a 
  

   yeliow 
  powder, 
  which 
  appears 
  to 
  be 
  pure 
  limonite, 
  and 
  is 
  doubtless 
  

   a 
  product 
  of 
  decomposition. 
  

  

  At 
  Broomborough 
  quarry, 
  also 
  near 
  Totnes, 
  there 
  occurs 
  a 
  singular 
  

   rock, 
  evidently 
  included 
  in 
  this 
  series, 
  of 
  a 
  dull 
  purplish 
  and 
  

   brownish 
  colour, 
  in 
  which 
  patches 
  and 
  strings 
  of 
  a 
  greenish, 
  felstone- 
  

   like 
  substance 
  resembling 
  porcellanite 
  are 
  included, 
  with 
  amygda- 
  

  

  