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  THE 
  

  

  QUARTERLY 
  JOURNAL 
  

  

  OF 
  THK 
  

  

  GEOLOGICAL 
  SOCIETY 
  OF 
  LONDON. 
  

  

  EDITED 
  BY 
  

  

  THE 
  ASSISTANT-SECRETARY 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  Quod 
  si 
  cui 
  mortalium 
  cordi 
  et 
  curae 
  sit 
  non 
  tantum 
  iaventis 
  heerere, 
  atque 
  iis 
  uti, 
  sed 
  ad 
  ulteriora 
  

   penetrare 
  ; 
  atque 
  non 
  disputando 
  adversarium, 
  sed 
  opere 
  naturam 
  vincere 
  ; 
  denique 
  non 
  belle 
  et 
  probabiliter 
  

   opinari, 
  sed 
  certo 
  et 
  ostensive 
  scire 
  ; 
  tales, 
  tanquara 
  veri 
  scientiarum 
  filii, 
  nobis 
  (si 
  videbitur) 
  se 
  adjungant. 
  

   —Novum 
  Organum, 
  Prcefatio. 
  

  

  VOLUME 
  THE 
  TWENTIETH. 
  

  

  1864. 
  

  

  PART 
  THE 
  FIRS 
  r 
  

   PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  I 
  Y. 
  

  

  LONDON 
  : 
  

   LONGMAN, 
  GREEN, 
  LONGMAN, 
  ROBERTS, 
  AND 
  GREEN. 
  

  

  PARIS:— 
  FRIED. 
  KLINCKSIECK, 
  11 
  RUE 
  DE 
  LILLE; 
  J. 
  ROTHSCHILD, 
  14 
  RUE 
  DE 
  BUC1 
  

  

  LEIPZIG, 
  T. 
  O. 
  WEIGEL. 
  

  

  SOLD 
  ALSO 
  AT 
  THE 
  APARTMENTS 
  OF 
  THE 
  SOCIETY. 
  

   MDCCCLXIV. 
  

  

  