1852.] LYELL BELGIAN TERTIARY FORMATIONS. 331 



gument to prove their greater antiquity, because a fault may have 

 thrown them down. T am rather of opinion that the beds of the 

 quarry are older than the green marls or shelly glauconite, ^, figs. 4 

 and 5. 



The following are the fossils found by me in the sandstone : — 



Fossils of the Sand-pit at the south-east base of the Hill of Cassel, 

 or Planque*s quarry, 



Lunulites. Ostrea cymbula, Lamk. 



Solen. Vermetus Bognorensis ?, Sow., or Nystii ? 



Panopaea intermedia ?, Sow. Trochus agglutinans, Lamk. 



Corbula. Phorus Parisiensis, D'Orb. 



Mactra seraisulcata ? Larak. Turritella. 



Lucina divaricata, Lamk. Natica patula, Desk. 



mutabilis, Lamk. Bulla ? 



Cytherea laevigata, Lamk. Fusus. 



; allied to C. nitidula, Lamk. Rostellaria macroptera, Lamk. 



Cardium porulosum, Brander. Voluta, two species. 



; like C. discors, Lamk. Terebellum(Seraphs)convolutum,Za>wA. 



Cardita planicostata, Lamk. Lenita patelloides, E. Forbes. 

 Nucula margaritacea, Lamk. Nucleolites patelloides, Galeotti. 



Pectunculus ; large species. Asterias. 



Limopsis ? Myliobates. 



Ostrea flabellula, Lamk. Lamua. 



These fossils show clearly that we have here such an assemblage as 

 belongs to the beds which in England and France contain Num- 

 mulites Icevigatus. 



After examining the numerous sections exposed in other parts of 

 the Hill of Cassel, I could find no fossiliferous strata older than those 

 above enumerated. Next to the sands already mentioned are green 

 and yellowish sands and clays, which form the upper part of the 

 Systeme Tpresien of Dumont, but in which I could not detect the 

 usual fossil, Nummulites planulatus. 



Still lower, a vast thickness of brown clay (F 1, fig. 4), correspond- 

 ing to the London Clay, has been bored at the railway station to the 

 depth of 100 metres, or 320 English feet, without the bottom being 

 reached. 



In naming the above fossils of Cassel, a great part of which are 

 unfortunately in the state of casts, I had the advantage of M. Nyst's 

 assistance, whose collection of Belgian species is most extensive and 

 whose palaeontological skill is well known. In comparing them since 

 with British fossils, I have been assisted by Mr. Morris. A general 

 list of the whole is given in Table XIII. p. 351, where two columns 

 are devoted to them, entitled " Upper" and " Lower." The 

 " Upper " column refers to those shells of the Hills of Mont Noir 

 and Cassel which belong to strata decidedly above the " Nummulites 

 Icevigatus bed." The "Lower" refers to the Cassel shells which 

 belong to the bed last mentioned, and to the other fossiliferous strata 

 of sand and green marls above enumerated as occurring in the Hill of 

 Cassel. 



I have omitted the Boeschepe shells in Table XIII. , as their posi- 

 tion was not positively ascertained, although, for reasons before stated, 

 I should place them in the "Upper" column. 



