236 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



or rather admit in evidence of identity, the progressive changes appa- 

 rent in this series as it ranges from south to north and north-west. 

 In the neighbourhood of Paris, the "Glauconie grossiere" is but 

 very sHghtly developed ; in the Oise and Aisne it becomes an import- 

 ant subdivision of the " Calcaire grossier," consisting of thick beds 

 of partially consolidated calcareo-quartzose sands, more or less 

 mixed with green sands, and with a slight conglomerate basement. 

 The fossils are often numerous, and the same as those of the Calcaire 

 grossier. At Cassel this zone consists, as before mentioned, of light- 

 coloured siliceous sands, green sands, and calcareous bands irregularly 

 mixed, and containing only a small number of fossils. Then passing 

 to the Bagshot district, we find a single thick bed of nearly unmixed 

 green sand with a few subordinate beds of fine foliated clay and 

 quartzose sand, together about 30 feet thick. The calcareous bands 

 are here entirely wanting. Fossils are very rare ; they consist of 

 the following named and characteristic species, which are sufficient 

 to show, with the collateral evidence of mineral structure and super- 

 position, the true relation of the group. 



Middle 



Bagshot Syst&me 



Sands. Bruxellien. 



Cardium semistriatum, Desk. ... Chobham. Cassel. 



Corbula gallica, Lam Chobbam. Cassel. 



plicata, £'c?t<; Shapley. 



striata, DesA Shapley. Brussels? 



Nucula similis, Sow Shapley. Cassel. 



Nummulites Isevigatus, Brug.... Chobham. Cassel. 



Ostrea jflabellula, Lam Chohbam. Cassel. 



Pecten corneus, S'ow. ? Shapley. Brussels? 



Turritella sulcifera, Lam Goldsworth 



Venericardia acuticostata, Lam. Goldsworth 



elegans, Des^ Shapley. 



^\dimco%t2i,Desh.{abundant) Chobham. Cassel. 



Calcaire 



Grossier 



and o J 

 ^, Sands, 



Glauconie „„_^.' 



Grossiere 



Oise. 

 Oise. 



Brack- 

 lesham 



Hants. 



Lamna elegans, Agas 



compressa, Agas.l 



Carcharodon angustidens, Agas. 



Pristis contortus, Dix 



Otodus obliquus, Agas 



Myliobates striatus, Agas. ? 



iEtobates irregularis, Agas 



Edaphodon Bucklandi, Agas 



leptognathus, Agas 



eurygnathus, Agas 



Goldsworth. Cassel. 



Goldsworth 



Goldsworth. Brussels ? 

 Goldsworth. Brussels ? 

 Goldsworth. Brussels. 

 Goldsworth. Brussels. 

 Goldsworth. Brussels ? 

 Goldsworth. Brussels. 



Goldsworth 



Goldsworth 



Oise. 

 Oise. 

 Oise. 

 Oise. 



Aisne. 

 Oise. 

 Oise. 

 Oise. 



Oise. 

 Oise. 

 Oise. 



Oise. 



The Brussels species marked with ? are in Om. d'Halloy's lists of the fossils of 

 the Sables calcariferes ; see note f, p. 233. 



With the exception of three species, peculiar to the English area, 

 there are nineteen which occur likewise either in the Calcaire gros- 

 sier zone of Cassel or in that of Brusssels ; and 14 of these (inclu- 

 ding all these shells except one) species range into the Paris Tertiary 

 district. The Nummulites IcEvigatus, Venericardia planicosta^ V. 

 acuticosta, and Ostrea fiahellula abound in the Glauconie grossiere 

 and the lower beds of the Calcaire grossier, and it is on this level 



