326 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, 



Shells of the Glauconite of the Hill of Boeschepe near Cassel. 



1. Crassatella plicata ?, Sow. 10. Mytilus, another species. 



2. Lucina squamula, J9e*^. 11. Ostrea flabellula ?, Zam^. 



3. Cytherea or Venus. 12. Fusus or Murex?; allied to M.fron- 



4. Cardium porulosum, Brander. dosus or M. cornutus. 



5. , with fine striae. 13. Cassidaria carinata?, LamJc. 



6. , third species. 14. Voluta digitalina ?, LamJc. 



7. Cardita acuticostata ?, Zam^. 15. Cypraea; cast, allied to C. inflata, 



8. Area barbatula, Lamk. Lamk. 



9. Mytilus acutangulus, i)esA. 16. Ovula; of very large size. 



Cardium porulosum, an Ostrea (probably O. fahellula), and a 

 Mytilus, are the most common among the casts. The most striking 

 fossil, however, was one discovered here by M. Curtel, and now in 

 the collection of M. Meugy at Lille. It is an Ovula of the size of 

 Cyprcea Coombii, Dixon, * Foss. Suss.' pi. 8. fig. 6, or of Ovula tu- 

 berculosa, Desh. * Coq. Foss. de Paris,' pi. 97. fig. 17. On my 

 showing the cast, however, to M. Deshayes, he pronounced it to be 

 different, and to agree with an unpublished shell, of which he pos- 

 sesses imperfect remains from a bed of the Calcaire grossier at Chau- 

 mont in France, overlying strata containing Cerithium giganteum. 



As the Boeschepe glauconite succeeds immediately to the ferrugi- 

 nous sands, and, according to M. Curtel, occurs at the height of 112 

 metres above the sea (only 12 metres below the summit of the hill 

 of Boeschepe), I am inclined to identify it with a similar glauconite 

 found at Cassel (at/, fig. 4) above the "bande noire" {g, fig. 4), after- 

 wards to be mentioned ; but, as the nummulitic beds of Cassel have 

 not yet been observed in the hills of Boeschepe or Mont Noir, I can- 

 not decide vnth confidence on its exact position. 



We may now return to the Hill of Cassel, which, as before stated, 

 is capped by the Diest sands (B 2, fig. 4), under which are other 

 ferruginous strata {e, fig. 4), as yet unproductive of fossils, but which 

 I believe to be of the same age as the Mont Noir beds already de- 

 scribed. M. Meugy estimates the united thickness of these sands, 

 B 2, and /, fig. 4, at ^^ feet. Their junction with the beds next 

 below is not seen, but on the eastern slope of the hill, which faces 

 the Mont des Recollets, a section is laid open in an excavation for 

 stone and sand, called Caton's Pit from the person who now works 

 it, which may be regarded as exhibiting the continuation of the 

 series. The mass of clay without fossils on the left side of this 

 section {z, fig. 5) is unconformable, as here represented. It is of 

 considerable thickness, perhaps 20 to 30 feet ; but neither could I, nor 

 M. Meugy who examined it vdth me, determine its true age. 



(1.) The bed/, figs. 4 & 5, is 34 feet thick, and consists of a sandy 

 glauconite with some thin layers of clay in its lower portion. In parts 

 it is spotted with yellow ; in other beds it contains coarse blackish-green 

 grains like those of the glauconite of Boeschepe, and, as in that hill, 

 impressions of shells occur, the calcareous matter of the shell having 

 wholly disappeared. The only recognizable species were Pecten cor- 

 neus and Cardium semigranulatum. The general dip of these strata 



