330 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, 



(10.) " White sands ; " with three or four layers of stone similar to 

 those above described, each 8 or 10 inches in thickness, with few 

 casts of shells, one of them a cast of Lucina divaricata. Some of the 

 sand snow-white ; the lower 8 feet, in which the sand is whitest, not 

 exposed, but pierced by boring. 



(11.) "Green marls" {i, figs. 4 & 5) ; thickness 12 feet. Here 

 the continuous section ceases, but I have no doubt that the green 

 marls and glauconite seen at a lower level immediately to the north 

 (in an adjoining deep lane, at the distance of a few hundred yards 

 only), and similar beds occurring to the eastward (in the road leading 

 up the slope of the Mont des Recollets), are next in the descending 

 order. Some of this coarse-grained sandy glauconite is very dark- 

 coloured, and in parts very calcareous. I obtained from it the fol- 

 lowing fossils : 



Turbinolia sulcata, Larak. Dentalium. 



Cytherea Isevigata, Lamk. Bifrontia serrata, Besh. 



suberycinoides ? Besh. Turritella multisulcata, Lamk., or inter- 



Cardium porulosum, Brander. media ? Besh. 



, another species. imbricataria, Lamk. 



Cardita decussata, Lamk. Sigaretus canaliculatus, Sow. 

 Pectunculus. Natica parisiensis, B'Orb. 

 Ostrea virgata, Goldf. Pleurotoma. 

 flabellula, Lamk. 



Between the green fossiliferous marls last mentioned {i, figs. 4 

 and 5) and the upper part of the Mont des Recollets, where there is 

 a large deserted quarry on the western brow of the hill, we may trace 

 in the ascending order nearly all the beds already described, from 

 i, figs. 4 and 5, to the Bande noire. Several of the stony concre- 

 tionary sandstones are visible, and, overlying these, the Bande noire 

 itself, with Ostrea injlata and Nummulites variolarius, is very con- 

 spicuous. Above the whole appear the glauconiferous and ferrugi- 

 nous beds considered as "Tongrian" by MM. Dumont and Meugy, 

 e, fig. 4, and the Diest sand, B 2. 



There is a large sand-pit at the south-eastern base of the Hill of 

 Cassel, belonging to M. Planque, at a somewhat lower level than the 

 green marls {i) already described, where a vertical section of sands 

 50 feet thick is laid open. Here several oblique shifts occur, inter- 

 secting the beds at a high angle, one of which has thrown down some 

 of the strata as much as 12 feet perpendicularly. At the top of the pit 

 are greenish and yellow sands without fossils. Lower down there are 

 from 35 to 40 feet of white and yellow sands ; and in some seams of the 

 yellow sands stained with ferruginous matter, I found numerous speci- 

 mens of Nummulites Icemgatus and N. scaber in a very decomposed 

 state, so that M. d'Archiac had much difiiculty in identifying the 

 species. Lastly, at the bottom of the whole is a white sand, 5 feet 

 thick, passing occasionally into a sandstone with casts of shells, 

 below which dark green sands and glauconite have been pierced in 

 boring. The absence of the five or six stony beds, g^ and h\ fig. 5, in 

 these white sands of M. Planque' s quarry makes it difiicult to ima- 

 gine that we have here the representatives of the same series as in 

 Caton's pit ; the difference of level would not of itself be a valid ar- 



