1852.] 



LYELL BELGIAN TERTIARY FORMATIONS. 



327 



and of those immediately subjacent is at a slight angle towards the 

 north-east. 



Fig. 5. — Section in Caton's Pit, on the eastern slope of the Hill of 



Cassel. 



S. ^___-.N. 



». Bed of clay, without fossils. 



/. Sandy glauconite (1). 



g. "Black band" with Ostrea inflata and Num. tmriolarius (2). 



g'. Sands with Nipadites, Nautilus, Cerithium giganteum. Num. variolarius, &c. (3 to 6). 



h. Green sand and sand-rock with Num. Icevigatus (7). 



h'. Sands and sandstone with Ostrece, &c. (8 to 10). 



i. Green naarls (11). 



(2.) Next below is a dark bed, called by the workmen la hande 

 noire {g, figs. 4 and 5), 1^ foot thick. It is divided in some places 

 by thin layers of yellow sand, in which I found the following fossils : 



Shells of the " Bande noire" Cassel (ff, figs. 4 & 5). 



Numraulites variolarius, Lamh. 



Cryptodon ? 



Venus; small. 



Cardita. 



Nucula margaritacea, Lamk. 



Pecten imbricatus ,■' Besh. 



Pecten plebeius, Lamk. 

 Anomia laevigata, Sow. 

 Ostrea inflata, Besh. 

 Dentalium strangulatum, BesJi. 

 Natica. 

 Turritella. 



The presence of Nummulites variolarius and Ostrea inflata indi- 

 cates the commencement of those Eocene strata which are called at 

 Brussels the " Laeken beds/' and to a higher division of which those 

 sands in the Cassel hills, which have been hitherto called " Tongrian," 

 may perhaps belong. 



(3.) Immediately below the hande noire are beds of yellowish 

 sand with green grains, 9 feet thick. "Within a foot of the top of 

 this mass is an irregular layer of sandstone, or a bed of nodules of 

 sand cemented by calcareous matter, in which many of the following 

 fossils occur in the state of casts, while the rest are free in the sand. 



Nummulites variolarius, Lamk.\ very 



abundant. 

 Turbinolia sulcata, Lamk. 



T. Nystiana ? Haime. 

 Lunulites radiatus, Lamk. 

 Clavagella coronata, Besh. 

 Teredina. 



Corbula pisum, Sow. 



Tellina rostralis, Lamk. 



Lucina (Loripes) divaricata, Lamk. 



Venus; the same as one found at 



Laeken. 

 Venus elegans ? Sow. 

 Cytherea suberycinoides, Besh. 



