﻿3S6 
  BEY. 
  E. 
  HELL 
  OX 
  THE 
  ROCKS 
  Of 
  

  

  the 
  coarseness 
  increases, 
  so 
  do 
  the 
  angularity 
  of 
  the 
  grains 
  and 
  the 
  

   proportion 
  of 
  felspar, 
  till 
  we 
  find 
  what 
  seems 
  merely 
  a 
  disintegrated 
  

   granite, 
  a 
  perfectly 
  typical 
  arkose, 
  of 
  which 
  my 
  best 
  example 
  comes 
  

   from 
  the 
  Casqnets. 
  As 
  might 
  be 
  expected 
  from 
  such 
  materials, 
  

   current-bedding 
  is 
  frequent 
  : 
  so 
  frequent 
  as 
  to 
  be 
  the 
  rule 
  rather 
  

   than 
  the 
  exception. 
  AVe 
  might 
  expect 
  also 
  to 
  find 
  beds 
  of 
  conglo- 
  

   merate. 
  Xo 
  mass 
  seems 
  to 
  consist 
  chiefly 
  of 
  pebbles, 
  but 
  pebbles 
  do 
  

   occur. 
  On 
  Burhou 
  I 
  did 
  not 
  detect 
  any 
  : 
  but 
  the 
  manager 
  of 
  the 
  

   Mannez 
  Quarry 
  said 
  that 
  a 
  single 
  one 
  would 
  often 
  be 
  found 
  in 
  an 
  

   otherwise 
  uniformly 
  fine 
  bed, 
  and 
  showed 
  me 
  seYeral 
  so 
  found. 
  At 
  

   the 
  Casqnets 
  they 
  are 
  frequent, 
  as 
  also 
  in 
  the 
  quarry 
  north-west 
  of 
  

   Essex 
  Castle 
  ; 
  while 
  in 
  a 
  quarry 
  in 
  the 
  outlier 
  north 
  of 
  the 
  Coque 
  

   Lihou 
  they 
  are 
  numerous 
  and 
  range 
  up 
  to 
  three 
  or 
  four 
  inches 
  long. 
  

  

  The 
  current-bedding, 
  arkose 
  material, 
  and 
  sporadic 
  pebbles, 
  all 
  

   point 
  to 
  the 
  immediate 
  neighbourhood 
  of 
  a 
  coast, 
  probably 
  to 
  a 
  

   coast 
  like 
  the 
  present, 
  with 
  cliffs 
  and 
  beaches, 
  tide-swept 
  races, 
  and 
  

   wave-washed 
  reefs. 
  And 
  in 
  fact 
  at 
  the 
  outlier 
  mentioned 
  north 
  of 
  

   the 
  Coque 
  Lihou 
  these 
  grits 
  can 
  be 
  seen 
  reposing 
  on 
  the 
  crystalline 
  

   rock, 
  an 
  actual 
  portion 
  of 
  the 
  bed 
  of 
  that 
  ancient 
  sea. 
  The 
  rock, 
  too, 
  

   is 
  not 
  the 
  granite 
  proper, 
  but 
  a 
  mass 
  of 
  one 
  of 
  the 
  pink 
  granitic 
  

   intrusions 
  which 
  occur 
  so 
  abundantly 
  in 
  the 
  granite 
  *. 
  

  

  The 
  bedding 
  of 
  the 
  series 
  is 
  extremely 
  marked, 
  and 
  may 
  be 
  

   recognized 
  from 
  a 
  considerable 
  distance. 
  The 
  dip 
  varies 
  : 
  it 
  may 
  

   perhaps 
  be 
  60° 
  at 
  Essex 
  Castle, 
  but 
  is 
  usually 
  from 
  45° 
  to 
  30 
  c 
  . 
  and 
  

   in 
  Burhou 
  is 
  sometimes 
  almost 
  nil. 
  Erom 
  the 
  Casquetsto 
  Alderney 
  

   the 
  direction 
  varies 
  between 
  S. 
  andX.E., 
  but 
  on 
  the 
  average, 
  and 
  in 
  

   general, 
  is 
  S.E. 
  At 
  a 
  spot 
  on 
  Little 
  Burhou, 
  where 
  the 
  shore 
  has 
  

   cut 
  a 
  horizontal 
  section, 
  one 
  bed 
  makes 
  a 
  perfect 
  letter 
  S 
  in 
  a 
  

   length 
  of 
  50 
  yards 
  : 
  as 
  a 
  rule, 
  however, 
  there 
  is 
  no 
  contortion. 
  I 
  

   have 
  not 
  noticed 
  any 
  small 
  faults, 
  but 
  it 
  is 
  plain 
  that 
  on 
  a 
  large 
  

   scale 
  there 
  is 
  much 
  dislocation, 
  for 
  the 
  Burhou 
  beds 
  dip 
  directly 
  to- 
  

   wards 
  the 
  crystalline 
  mass 
  of 
  Alderney, 
  and 
  the 
  beds 
  at 
  Omonville 
  

   are 
  vertical. 
  I 
  cannot 
  make 
  any 
  estimate 
  of 
  the 
  thickness 
  of 
  the 
  

   series. 
  Sections 
  of 
  considerable 
  length 
  are 
  shown 
  in 
  Burhou 
  and 
  in 
  

   the 
  quarries. 
  It 
  is 
  difficult 
  to 
  disprove 
  the 
  existence 
  of 
  faults, 
  but 
  

   no 
  one, 
  I 
  think, 
  can 
  doubt 
  that 
  a 
  thickness 
  of 
  several 
  hundred 
  feet 
  

   may 
  be 
  seen. 
  

  

  The 
  pebbles 
  and 
  angular 
  fragments, 
  where 
  found, 
  are 
  of 
  various 
  

   natures 
  : 
  many, 
  perhaps 
  most 
  of 
  the 
  smaller 
  ones, 
  are 
  white 
  milky 
  

   quartz, 
  some 
  a 
  grey 
  mudstone, 
  some 
  a 
  crystalline 
  granitic 
  rock, 
  one 
  

   or 
  two 
  very 
  dark, 
  perhaps 
  basaltic 
  : 
  I 
  did 
  not 
  notice 
  any 
  of 
  the 
  local 
  

   granite, 
  but 
  several 
  seemed 
  to 
  be 
  from 
  the 
  pink 
  dykes 
  so 
  abundant 
  

   in 
  that 
  mass. 
  Most 
  of 
  the 
  larger 
  pebbles 
  consist 
  of 
  a 
  compact, 
  

   almost 
  glassy, 
  igneous 
  rock 
  with 
  occasional 
  porphyritic 
  felspars, 
  

   probably 
  a 
  rhyolite. 
  Such 
  rocks 
  are 
  abundant 
  in 
  Jersey 
  ; 
  the 
  dark- 
  

   brown 
  colour 
  characteristic 
  there 
  is 
  shown 
  in 
  many 
  (one 
  of 
  which 
  I 
  

   have 
  had 
  cut). 
  M. 
  Bigot 
  mentions 
  a 
  pebble 
  with 
  spherulites, 
  which 
  

   are 
  also 
  frequent 
  in 
  Jersey 
  : 
  while 
  at 
  Omonville 
  I 
  myself 
  found 
  a 
  

  

  * 
  M. 
  Bigot 
  has 
  noticed 
  this 
  and 
  given 
  a 
  diagram 
  of 
  the 
  contact. 
  

  

  