﻿214 
  ME. 
  W. 
  P. 
  D. 
  STEBBING 
  Off 
  TWO 
  BOULDERS 
  OE 
  [May 
  1897, 
  

  

  bituminous 
  coal, 
  with 
  veins 
  of 
  ferruginous 
  clay, 
  in 
  the 
  Upper 
  Chalk 
  

   of 
  Kent. 
  This 
  mass, 
  which 
  weighed 
  about 
  4 
  cwt., 
  and 
  was 
  from 
  

   4 
  to 
  10 
  inches 
  thick 
  and 
  about 
  4 
  feet 
  square, 
  was 
  discovered 
  at 
  a 
  

   depth 
  of 
  180 
  feet 
  in 
  the 
  process 
  of 
  tunnelling 
  for 
  the 
  L. 
  C. 
  and 
  

   D. 
  Eailway, 
  between 
  Lydden 
  Hill 
  and 
  Shepherdswell, 
  a 
  few 
  miles 
  

   from 
  Dover. 
  It 
  was 
  probably 
  of 
  Oolitic 
  or 
  Wealden 
  age. 
  

  

  Messrs. 
  Jukes-Browne 
  and 
  W. 
  Hill 
  mention 
  l 
  that 
  they 
  were 
  

   informed, 
  by 
  a 
  man 
  working 
  in 
  a 
  Totternhoe 
  Stone 
  pit 
  at 
  Isleham, 
  

   of 
  the 
  find 
  of 
  a 
  number 
  of 
  large 
  stones 
  mixed 
  with 
  material 
  that 
  

   looked 
  like 
  rotten 
  wood, 
  in 
  a 
  cavity 
  in 
  undisturbed 
  Chalk. 
  

  

  I 
  noticed 
  last 
  September 
  in 
  the 
  Brighton 
  Museum 
  a 
  block 
  of 
  

   quartzite, 
  weighing 
  13 
  lbs. 
  14 
  oz., 
  from 
  the 
  Middle 
  Chalk 
  of 
  

   Houghton, 
  Sussex. 
  It 
  was 
  exhibited 
  by 
  Mr. 
  Henry 
  Willett 
  when 
  

   Godwin-Austen 
  read 
  his 
  paper 
  on 
  the 
  Purley 
  boulder 
  before 
  this 
  

   Society. 
  It 
  has 
  the 
  lower 
  valve 
  of 
  a 
  Spondylus, 
  a 
  Polyzoan, 
  a 
  

   Serpula, 
  and 
  the 
  remains 
  of 
  several 
  other 
  bodies 
  still 
  adhering 
  to 
  

   it. 
  The 
  same 
  museum 
  contains 
  also 
  a 
  pebble 
  of 
  clay-slate, 
  weighing 
  

   about 
  1 
  lb., 
  found 
  in 
  the 
  Lower 
  Chalk 
  at 
  North 
  Stoke. 
  

  

  The 
  Museum 
  of 
  Practical 
  Geology, 
  Jermyn 
  Street, 
  possesses 
  a 
  

   large 
  ovoid 
  quartzite-boulder 
  from 
  West 
  Thurrock, 
  discovered 
  30 
  feet 
  

   below 
  the 
  surface, 
  and 
  two 
  of 
  quartzite 
  and 
  greenstone 
  from 
  Gay 
  ton, 
  

   Norfolk. 
  

  

  Many 
  fragments 
  of 
  foreign 
  rocks 
  have 
  been 
  found 
  at 
  various 
  

   times 
  in 
  the 
  Cambridge 
  Greensand. 
  2 
  In 
  1872 
  3 
  Messrs. 
  W. 
  J. 
  

   Sollas 
  and 
  A. 
  J. 
  Jukes-Browne 
  described 
  several 
  different 
  examples 
  

   from 
  their 
  own 
  collections 
  and 
  the 
  Woodwardian 
  Museum, 
  

   Cambridge. 
  These 
  were 
  of 
  various 
  shapes, 
  nearly 
  all 
  being 
  sub- 
  

   angular, 
  with 
  only 
  one 
  or 
  two 
  rounded 
  specimens. 
  They 
  ranged 
  in 
  

   size 
  from 
  1 
  cubic 
  foot 
  downwards, 
  some 
  being 
  very 
  much 
  decom- 
  

   posed. 
  Others 
  were 
  scratched 
  as 
  if 
  by 
  ice, 
  while 
  almost 
  all 
  were 
  

   encrusted 
  with 
  Ostrece 
  and 
  Plicatulce. 
  The 
  following 
  rocks, 
  among 
  

   others, 
  were 
  represented 
  : 
  coarse 
  yellowish 
  grit, 
  purplish-red 
  slate, 
  

   grey 
  and 
  reddish 
  sandstones, 
  a 
  fine 
  conglomerate, 
  Magnesian, 
  black 
  

   and 
  brown 
  siliceous 
  limestones, 
  granites, 
  black 
  basalt, 
  green 
  mica- 
  

   schist, 
  greenstone, 
  obsidian, 
  and 
  labradorite-rock, 
  also 
  joints 
  of 
  

   Poteriocrinus 
  and 
  fossil 
  resin. 
  One 
  of 
  the 
  granites, 
  marked 
  12 
  in 
  

   their 
  paper, 
  much 
  decomposed, 
  consisted 
  of 
  felspar, 
  black 
  mica, 
  

   masses 
  of 
  fibrous 
  hornblende, 
  and 
  irregular 
  crystals 
  of 
  quartz. 
  

  

  It 
  should 
  also 
  be 
  mentioned 
  that 
  a 
  large 
  boulder 
  of 
  spherulitic 
  

   rhyolite, 
  much 
  rounded 
  and 
  worn, 
  with 
  attached 
  Plicatulce, 
  was 
  

   found 
  in 
  the 
  Cambridge 
  Greensand 
  at 
  Ashwell, 
  Herts, 
  and 
  is 
  

   described 
  by 
  Prof. 
  Bonney 
  in 
  Proc. 
  Camb. 
  Phil. 
  Soc. 
  vol. 
  v. 
  p. 
  65. 
  4 
  

  

  1 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xliii. 
  (1887) 
  p. 
  554. 
  

  

  2 
  T. 
  G. 
  Bonney, 
  Proc. 
  Geol. 
  Assoc, 
  vol. 
  iii. 
  p. 
  1. 
  

  

  3 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xxix. 
  (1873) 
  p. 
  11. 
  

  

  4 
  Among 
  examples 
  of 
  boulders 
  in 
  rocks 
  composed 
  of 
  fine 
  sedimentary 
  or 
  

   organic 
  material 
  may 
  be 
  mentioned 
  the 
  following 
  : 
  — 
  Quartzite, 
  granitoid 
  and 
  

   other 
  rocks 
  in 
  the 
  Coal 
  Measures, 
  E. 
  W. 
  Binney, 
  Mem. 
  Lit. 
  & 
  Phil. 
  Soc. 
  Manch. 
  

   1851, 
  vol. 
  ix. 
  ser. 
  2, 
  p. 
  306 
  ; 
  T. 
  G. 
  Bonney, 
  Geol. 
  Mag. 
  1873, 
  p. 
  289, 
  and 
  Eep. 
  

   Brit. 
  Assoc. 
  (Birmingham), 
  1886, 
  Pres. 
  Addr. 
  Sect. 
  0, 
  p. 
  601 
  ; 
  J. 
  Radcliffe, 
  

   Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xliii. 
  (1887) 
  p. 
  599; 
  J. 
  Spencer, 
  ibid. 
  p. 
  734; 
  

  

  