﻿1864.] 
  

  

  SEELEY 
  — 
  HUNSTANTON 
  RED 
  ROCK. 
  

  

  329 
  

  

  sponge-rock, 
  though 
  only 
  in 
  patches. 
  There 
  are 
  many 
  fissures 
  in 
  

   this 
  stratum 
  and 
  in 
  the 
  chalk, 
  which 
  pass 
  down 
  to 
  the 
  top 
  of 
  the 
  

   Red 
  Rock; 
  they 
  are 
  filled 
  with 
  black 
  and 
  red 
  colouring-matter, 
  

   often 
  largely 
  mixed 
  with 
  recldish-brown 
  sand. 
  At 
  the 
  base 
  the 
  red 
  

   matter 
  thickens, 
  and 
  generally 
  enlarges 
  into 
  nests. 
  

  

  Bearing 
  on 
  this 
  subject 
  is 
  the 
  section 
  (fig. 
  1), 
  showing 
  a 
  slight 
  slip 
  

   in 
  the 
  Red 
  Rock 
  and 
  Carstone, 
  which 
  has 
  not 
  affected 
  the 
  chalk, 
  

   except 
  by 
  shivering 
  it, 
  and 
  by 
  forming 
  fissures 
  which 
  are 
  filled 
  in 
  as 
  

   shown 
  in 
  the 
  figure. 
  The 
  top 
  of 
  the 
  sponge-rock 
  is 
  merely 
  curved 
  ; 
  

   and 
  where 
  the 
  Red 
  Rock 
  is 
  in 
  the 
  middle 
  of 
  the 
  cliff 
  is 
  the 
  section 
  

   given 
  in 
  fig. 
  2. 
  Under 
  8 
  inches 
  of 
  top 
  earth 
  are 
  about 
  9 
  feet 
  of 
  re- 
  

   constructed 
  chalk, 
  quite 
  white, 
  and 
  seemingly 
  without 
  any 
  foreign 
  

   substance. 
  Below 
  this 
  is 
  about 
  20 
  feet 
  of 
  chalk, 
  then 
  the 
  sponge- 
  

   band, 
  and 
  finally 
  the 
  Red 
  Rock. 
  From 
  the 
  top 
  of 
  this 
  latter 
  up 
  to 
  

   the 
  reconstructed 
  chalk 
  extends 
  a 
  straight 
  but 
  obliquely 
  inclined 
  

   fissure, 
  which 
  expands 
  at 
  the 
  top, 
  trumpet-like, 
  to 
  a 
  width 
  of 
  at 
  least 
  

   3 
  feet, 
  and 
  similarly 
  expands 
  at 
  the 
  base 
  to 
  a 
  length 
  of 
  4 
  feet, 
  form- 
  

   ing 
  a 
  triangular 
  mass 
  which 
  displaces 
  the 
  sponge-band 
  entirely, 
  and 
  

   some 
  of 
  the 
  grey 
  sandy 
  chalk. 
  This 
  fissure 
  and 
  its 
  expansions 
  are 
  

   filled 
  with 
  red 
  matter, 
  which 
  is 
  darkest 
  in 
  the 
  line 
  of 
  the 
  fissure 
  and 
  

   at 
  its 
  base. 
  

  

  Fig. 
  1. 
  — 
  Section 
  showing 
  a 
  fault 
  in 
  the 
  Red 
  Rock 
  and 
  Carstone, 
  the 
  

   Sponge-bed 
  being 
  shattered. 
  

  

  w 
  A. 
  Fine 
  drab-coloured 
  sand. 
  

  

  B. 
  Yellow 
  sand 
  with 
  black 
  par- 
  

  

  ticles. 
  

  

  C, 
  D. 
  Ochreous 
  sand 
  with 
  black 
  

  

  particles. 
  

  

  E. 
  Deep-red 
  matter. 
  

   W. 
  Grey 
  sandy 
  chalk. 
  

   X. 
  Sponge-bed. 
  

   Y 
  1 
  , 
  Y 
  2 
  , 
  Y 
  3 
  . 
  Red 
  Rock. 
  

   Z. 
  Carstone. 
  

  

  

  lipii 
  

  

  ii 
  

  

  ii 
  

  

  

  Fig. 
  2. 
  

  

  Section 
  showing 
  a 
  fissure 
  in 
  the 
  CJialJc 
  of 
  Hunstanton 
  con- 
  

   taining 
  red 
  matter. 
  

  

  a. 
  Earth. 
  

  

  b. 
  Reconstructed 
  chalk, 
  4 
  ft. 
  thick. 
  

  

  c. 
  White 
  chalk. 
  

  

  d. 
  Band 
  of 
  red 
  chalk. 
  

  

  e. 
  Grey 
  sandy 
  chalk. 
  

   /. 
  Sponge-bed. 
  

  

  g. 
  Red 
  Rock. 
  

  

  