Geological Society. 239 



Upper Ypresian sands of Belgium, which leaves no doubt of their being 

 of Lower Eocene age, and consequently the Lower Bagshots must be 

 placed upon the same horizon. There is no separating line of 

 erosion between the London Clay and the Lower Bagshots, the 

 upper part of the former is sandy, and the lower part of the latter 

 frequently argillaceous. Similarly no definite line can be drawn 

 between the Upper and Lower Ypresian ; but in both countries this 

 series is separated from overlying beds by a well-marked line of 

 erosion. So also in France the base of the Calcaire Grassier (Brackles- 

 ham Beds) is a pebbly greensand resting on an eroded surface of 

 the Sands of the Cuise-de-la-Motte. In Belgium, in Whitecliff Bay, 

 and in the Bagsbot district the Upper Eocene rests upon an eroded 

 surface of the Lower Eocene. Subjoined is the author's proposed 

 classification of the Eocene : — 



Proposed Classification of the Eocene. 





England. 



Belgium. 



France (Paris Basin). 



Upper 



a. Barton Beds. 



a. Wemrnelian. 



a. Sables Moyens or Gres 

 de Beauchamp. 



b. Bracldeshani Beds. 



= Upper and 

 b*. Middle Bagshots. 



Laekenian 



and 

 Bruxellian. 



b. Lpper Calcaire Grossier. 

 b*. Glauconie Crossiere. 



Lower 



■ 



Wanting. 



London Sands = 

 Lower Bagshot. 



London Clay. 



Basement or Oldhaven 

 Beds. 



Woolwich and Bead- 

 ing Beds. 



Thanet Sands. 



Wanting. 



Paniselian. 

 Upper Ypresian. 



Lower Ypresian. 



? 



!■ Upper Landenian. 



f Lower Landenian 

 \ and Heersian. 



Calcaire de Mons. 



[ Sands of Cuise-de-la- 

 |" Motte. 



Wanting. 



f Sables Inferieurs of the 

 ! Soissonnais, including 

 ■{ the Marls and Sands of 

 | Billy, the ' Lignites ' and 

 ^ Sands of Bracheux. 



Sands of St. Omer, Douai, 

 and La Fere. 



Strontianiferous Marl of 

 Meudon ? 



2. " On the Cambrian and Associated Bocks in North-west Caer- 

 narvonshire." By Prof. J. E. Blake, M.A., F.G.S. 



After referring to the published views of Professor Sedgwick, 

 Sir A. C. Bamsay, and the Geological Survey, Profs. Hughes and 



