﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  

  

  129 
  

  

  Upper 
  Group, 
  containing 
  (A) 
  marls 
  with 
  Exogyra 
  virgula, 
  (B) 
  the 
  

   Astarte 
  Limestone 
  ; 
  II. 
  The 
  Coral 
  Bag 
  ; 
  and 
  III. 
  The 
  Oxfordian 
  

   group, 
  in 
  3 
  subdivisions. 
  

  

  The 
  Oxfordian 
  Group. 
  — 
  The 
  nodular 
  beds 
  contain 
  a 
  character- 
  

   istic 
  fauna 
  precisely 
  that 
  of 
  our 
  own, 
  viz. 
  Am. 
  cordatus, 
  Modiola 
  

   bipartita, 
  Pema 
  quadrata, 
  Pectenfibrosiis, 
  Ostrea 
  dilatata, 
  and 
  Rhyn- 
  

   clionella 
  Tliurmanni. 
  These 
  represent 
  the 
  " 
  rTothe 
  Grits 
  " 
  of 
  Wey- 
  

   mouth 
  and 
  the 
  Lower 
  Calcareous 
  Grits 
  of 
  Yorkshire. 
  Succeeding 
  

   these 
  are 
  beds 
  which 
  in 
  Yorkshire 
  belong 
  to 
  the 
  Passage-series 
  

   above 
  the 
  Lower 
  Calcareous 
  Grits. 
  The 
  noticeable 
  shell 
  Trigonia 
  

   saintonensis, 
  Lycett 
  (T. 
  spinifera, 
  D'Orb.), 
  occurs 
  in 
  both 
  places, 
  and, 
  

   with 
  Ammonites 
  oculatus, 
  serves 
  to 
  show 
  the 
  Oxfordian 
  character 
  

   of 
  the 
  beds. 
  

  

  The 
  " 
  Ferruginous 
  Oolite 
  " 
  Hebert 
  refers 
  to 
  the 
  Middle 
  Oxfordian, 
  

   which 
  contains 
  a 
  well-marked 
  fauna 
  of 
  that 
  horizon. 
  Above 
  there 
  

   exist 
  certain 
  marls 
  with 
  Cidaris 
  florigemma 
  and 
  Pecten 
  articulatus. 
  

  

  The 
  Meuse 
  Department. 
  — 
  Buvignier 
  gives, 
  for 
  this 
  department, 
  

   the 
  following 
  classification 
  in 
  ascending 
  order 
  : 
  — 
  

  

  Upper 
  Jurassic. 
  

  

  I. 
  Barrois 
  Limestone 
  in 
  3 
  subdivisions, 
  600 
  feet 
  thick. 
  

   II. 
  Virgulian 
  Clays, 
  150 
  feet. 
  

   III. 
  Astartian 
  Limestones 
  in 
  2 
  subdivisions, 
  400 
  feet. 
  

  

  Middle 
  Jurassic. 
  

  

  I. 
  Coral 
  Eag 
  in 
  2 
  subdivisions, 
  400 
  feet. 
  

   II. 
  Oxford 
  Clay 
  in 
  3 
  subdivisions, 
  500 
  feet. 
  

  

  I 
  must 
  refer 
  the 
  student 
  to 
  the 
  admirably 
  detailed 
  analysis 
  of 
  the 
  

   geology 
  and 
  palaeontology 
  of 
  this 
  department 
  by 
  Mr. 
  Blake 
  (vide 
  

   pp. 
  505-516). 
  There 
  is 
  but 
  little 
  in 
  this 
  series 
  to 
  be 
  correlated 
  

   with 
  that 
  of 
  Britain. 
  

  

  The 
  Hattte-Marne 
  Department. 
  — 
  The 
  Upper 
  Jurassic 
  rocks 
  of 
  

   this 
  department 
  may 
  be 
  considered 
  as 
  typical 
  in 
  the 
  Paris 
  basin, 
  

   Iloyer* 
  divides 
  the 
  series 
  under 
  the 
  8 
  following 
  heads 
  : 
  — 
  

  

  A. 
  Portland, 
  under 
  3 
  penological 
  subdivisions. 
  

  

  B. 
  Kimmeridgian. 
  

  

  C. 
  Astartian, 
  under 
  2 
  petrological 
  subdivisions. 
  

  

  D. 
  Coralline 
  Oolite. 
  

  

  E. 
  Compact 
  Corallian 
  Limestone, 
  under 
  2 
  subdivisions. 
  

  

  F. 
  Upper 
  Oxfordian 
  marls. 
  

   C. 
  Middle 
  

  

  H. 
  Lower 
  ,, 
  ,, 
  

  

  The 
  newer 
  classification 
  is 
  far 
  more 
  complicated 
  and, 
  as 
  published 
  

   by 
  MM. 
  de 
  Loriol, 
  Iloyer 
  . 
  and 
  Tombeck, 
  is 
  as 
  follows 
  : 
  — 
  

  

  * 
  Eoyer. 
  "Note 
  surles 
  Terrains 
  Jurassiques 
  superieursetmoyens 
  de 
  la 
  Haute 
  

   Marne," 
  Bull. 
  Soc. 
  Geol. 
  France, 
  ser. 
  2, 
  vol. 
  ii. 
  p. 
  705. 
  

  

  VOL. 
  XXXVIIT. 
  I 
  

  

  