1852.] LYELL — BELGIAN TERTIARY FORMATIONS. 277 



sandy and Ml of eocene pebbles. This outlier is evidently the source 

 from which the pebbles at the Portobello section were derived ; and 

 the fliaty cledge, which covers the summits of these high hills, ap- 

 pears to be the source of the broken flints which strew the surface- 

 soil and are imbedded in it, more or less, down to the valley of the 

 Thames, diminishing in quantity with the descent and accumulated 

 in masses at the bottom of the valleys. The distribution of these 

 flints northward along the valleys, and more sparingly south of the 

 chalk-ridge, — the relations of the deposits containing them to the 

 mammalian beds of the valley of the Thames, — and the relations of 

 these, again, to the lower and upper erratics of the northern edge of 

 that valley, will form the subjects of future communications. 



2. On the Tertiary Strata of Belgium and French Flan- 

 ders. Part II. The Lower Tertiaries of Belgium. By 

 Sir C. Lyell, F.R.S., V.P.G.S. 



[Together with Part I., " On the Pliocene, Miocene, and Upper Eocene," read 

 May 5, 1852.] 



CONTENTS. 



§ 1. Introduction and Synoptical Table of the Tertiary formations. 



§ 2. Loess or Lehm. 



§ 3. Antwerp Crag. — Cetacean remains. Upper, middle, and lower Crag of 

 Antwerp, and comparison of their fossils with the Suffolk Crags and the 

 recent fauna. 



§ 4. Sands and Iron-sandstone of Diest. 



§ 5. Bolderberg Sands. 



§ 6. Limhurg Tertiary series. — 1. Upper Limburg beds at Rupelmonde, Schelle, 

 and Boom, and their fossils. 2. Tertiary strata in the neighbourhood of 

 Kleyn Spawen, and their threefold division. 3. Micaceous sands of Henis, 

 Geulem, Klimmen, &c. 4. Relation of the Rupelmonde and Boom Clay to 

 the Upper Limburg beds. 5. The Loess near Kleyn Spawen, and the denu- 

 dation of the Limburg Tertiary strata. 6. Synoptical tables of Limburg 

 fossils. 7. Nomenclature of the Limburg Tertiary strata, and whether they 

 should be referred to the Upper Eocene or Lower Miocene periods. 



§ 7. Middle Eocene Strata of Belgium and French Flanders, or the Nummulitic 

 Eocene. — 1. Eocene strata of Cassel, near Dunkirk; Hill of Cassel, Mont 

 Noir, and Boeschepe. 2. Middle Eocene strata of Brussels. Laeken Beds. 

 Dileghem, Jette, and Laeken. Relative position of different species of Num- 

 mulites. Brussels Beds, or Upper Nummulitic. Upper Brussels Sands. 

 St. Gilles, Ixelles, Etterbeek, and Dieghem. Fossil Crania and Echino- 

 derms. Fossiliferous Brussels Sands with calcareous concretions. Au- 

 derghem, St. Joose-ten-Noode, and Schaerbeek. Nipadites and Honium. 

 Lower Brussels Sands with grotto-stones. Dieghem schistose tripoli. 

 Cerit Mum giffanteum hed. 3. S&nds with Nummulites planulatus. Lower 

 Nummulitic strata near Brussels. Table of Brussels and Cassel Middle 

 Eocene fossils. Analogy of the Belgian, French, and Enghsh Eocene strata. 

 Middle Eocene strata at Mons and Mont Panisel. Renaix, Craye, and 

 Audenaerde. Courtray. Ghent. Mons-en-Pevelle. 



§ 8. London Clay proper of Cassel and Lille. 



§ 9. Plastic clay, sand, and lignite of Carvin near Lille, Jauche, Huppaye, &c. 



§ 10. Glauconite of Tournay, Angres, Folx-les-Caves, Orp-le-grand, Lincent, &c. 



§ 11. Marls and Glauconite of Heers. 



