1852.] LYELL — BELGIAN TERTIARY FORMATIONS. 335 



the same manner as at Cassel and Lille. There are, however, such 

 rapid changes in the mineral character of the sands of the Brussels 

 district, even at short distances, that it would be endless to attempt 

 to describe them all. The groups enumerated in Table XII. must 

 simply be understood as expressing some of the more marked litho- 

 logical and palseontological divisions. 



The Laeken beds, Table XII. I., and E. 1. of Table I., already 

 alluded to as occurring to the north of Brussels, are again found about 

 two miles to the south of the city, on the road-side between St. Gilles 

 and Foret, on ascending to the higher grounds at the point C, Map, 

 fig. 3, PI. XVII. They there consist of greenish sands, about 10 feet 

 thick, which are considered by Captain Le Hon as the lowest part of 

 the Laeken beds. In these I found 



Nummulites variolarius, Lamlc. Pecten plebeius ?, Lamk. 



Turbinolia Nystiana, Haime. Anomia laevigata, Sow. 



Lunulites radiatus ? Lamk. Ostrea flabellula, Lamk. 



Corbula pisum, Sow. Dentalium Deshayesianum, Galeotti. 



Cypricardia pectinifera, Morris. Turritella granulosa, Desh. 



Nucula raargaritacea ? Martini. Echinocyamus propinquus, Galeotti, sp. 



The position of these beds to the south of Brussels may be seen at 

 E. 1, fig. 8, where they are covered by ferruginous sands without 

 fossils (y), probably of the same age as those at y in Section fig. 6. 



[2.] Brussels beds, or Middle Nummulitic. Tipper Brussels Sands. 



Next below the Laeken beds come those strata which are com- 

 monly called "Bruxellian" by the Belgian geologists, and which 

 correspond to E. 2 of Table I. p. 279, and to II. « & 5, Table XII. 

 They consist of the Upper Brussels Sands, with a bed containing 

 Nummulites Icevigatus at the base. The chief points where fossils 

 have been obtained in them are the following : — 



(1.) ^S*^. Gilles. Chaussee Louise (D. Map, fig. 3, PI. XVII.). 



In the southern suburb of Brussels, on the side of the high-road called 

 Chaussee Louise, greenish sands are seen, which are from 15 to 20 

 feet thick at the point D of the Map, fig. 3, PI. XVII., and exhibit 

 two or three layers of large flattened concretions of sandstone, which 

 effervesce with acids. The following fossils in Captain Le Hon's col- 

 lection were obtained from this spot : — 



*Nummulites laevigatus, "] in a bed at *Ostrea flabellula, LamJc., and 0. vir- 

 Lamk. \ the base of gata, Goldf. 



* scaber, Lamk. J the section. *Dentalium Deshayesianum, Gal. 



Membranopora. *Spatangus Omalii, Gal. 



*Lichenopora. *Echinolampas affinis ?, Goldf. 



*Orbitolites complanatus, Lamk. *Lenita patelloides, Galeotti, sp. 



*LunuUtes radiatus ?, LamJc. Nucleolites approximatus, Galeotti. 



*Idmonea triquetra, Lamx. *Cidarites ?, sp. nov, 



*Gastrochaena. *Echinocyanius propinquus, Gal. 



*Pecten plebeius, Lamk. *Scutellina rotunda, Gal. 



corneus, Sow. Cancer Burtini ?, claws of. 



*Anomia laevigata, Sow. , smaller species. 



Lamna, teeth of 

 The species marked with * occur also at the Distillery ; vide infra. 



z 2 



