206 



PROCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY. 



POSTPONED PAPERS. 



On the Correlation of the Eocene Tertiaries of England, 

 France, and Belgium. By Joseph Prestwich, Jun., Esq., 

 F.R.S., F.G.S. 



[Read June 21, 1854*.] 



[Plate VIII.] 



Contents. 



Part I. — Lower Beds, — the London Group. 



§ 1. Known foreign Equivalents. 



§ ?. Grouping of the Lower Tertiary Strata in France, Belgium, and England. 



§ 3. Correlation of the several Divisions of the Lower Tertiaries. — The 



Thanet Sands and Systerae Landenien inferieur. 

 § 4. The Woolwich Sands (lower part of) and Sahles de Bracheux. 

 § 5. Middle beds of the Woolwich and Reading Series, — the Fluviatile Clays 



and Lignites ; Lignites du Soissonnais. 

 § G. The Upper Woolwich beds ; the Pebble beds ; Gres, Poudingues, and 



Sables (D'Archiac). 

 § 7. The Relation of the Lower Members of the French Series to the Sables 



Divers and Lits Coquilliers, or the Glauconie Moyenne. 

 § 8. The London Clay and Systeme Ypresien inferieur, or Glaise Ypresien ; 



not represented in the Paris Tertiary District. 

 § 9. The Lower Bagshot Sands ; Systeme Ypresien superieur or Sables 



Ypresiens ; Lits Coquilliers and Sables divers, or Glauconie moyenne. 

 § 10. Conclusion. 



Table of Equivalents. 



Explanation of Plate. 



Part I. — Lower Beds, — the London GROUpf . 



§ L Known foreign Equivalents. 



In a former paper J I pointed out the distinctive palseontological and 

 physical features of the London Clay and the Bracklesham Sands. 

 Having on a previous occasion shown that there exists a close analogy 



* For the other Communications read at this Evening Meeting, see Quart. 

 Journ. Geol. Soc. vol. x. pp. 454 et seq. 



t The correlative description of the upper groups is unavoidably deferred to a 

 later period. — J. P. 



X Quart. Journ. Geol. Soc. vol. x. p. 43.5. 



