192 



The calcaires a Pholadomyes contain many of these molluscs 

 embedded in fine marls in the normal position in which 

 they lived, — as PJioladomya Vezelayi, P. hucarclium, Scalprum, 

 carinata ? Ceromya striata, Anatina cegea, Terebratula coarctata, 

 T. intermedia, Ammonites Bakerice, Amm. hecticus, etc. ; lastly, 

 the series is terminated by compact Limestones, of which the 

 upper part is perforated by lithophagous moUuscs, covered 

 by large oysters, and these beds serve to support the first 

 ferruginous deposits of the Callovien stage. 



M. G. de Neeville * classifies the Bathonien as follows : — 



CornhrasJi. — Calcaireoolithique roux, alarges taches bleuatres, 



a Oolitlies miliaires bien egales. Cette assise renferme 



quatre a cinq petits bancs mameux. 

 a,"^ -^ Forest Marble. — Calc. compacte, par gros banc, de couleur 



blanc-grisatre, a structure tres-massive. 

 Grande Oolithe. — Calc. oolithique, blanc, a structure tres- 



variable. Terre a foulon et calcaire blanc jaundtre mameux. 



<2 s 



tt £ 

 ^ 



Assise marneuse ; a la base tres-argileuse et meme plastique, 

 et passant a un calcaire jaunatre marneux oolithique contenant 

 beaucoup de fossiles, tels que Ostrea acuminata. 



M. Ed. Piette has described the Etage Bathonien, in the 

 department of the Meuse, as consisting of three groups which 

 he thus characterizes : — 



o. — Calcaire marneux d'Etain avec Rbynchonella concinna, Terebratula 

 obovata, Ter digona, Ter cardium, Clj'peus patella, Echinobrissus 

 clunicularis. 15 metres. 



b. — Marnes grises de Bouvres : contenant, Pholadomya texta, Mytilus 

 Sowerbyanus, Terebratula ornitbocephala, Holectypus depressus, 

 &c. 60 metres. 



c. — Marnes et Calcaires d Ostrea acuminata de Monimedy avec 

 Ammonites Parkinsoni, Pholadomya Vezelayi, Ceromya rostrata, 

 Lima gibbosa, Ostrea acuminata, Ostrea Marsliii, Ehyncbonella 

 concinna, Ebyn. varians, &c. 80 metres. 



Group a appears to be synchronous with the Forest marble 

 and Bradford clay; group h to represent the Fullers Earth of 

 Box Tunnel, near Bath ; and group c, in part at least, the zone 

 oi Ammonites Parhinsoni, Inferior Oohte, Gloucestershire. 



* Legends explicative de Carte Geol. du Depart, de la Cote-d'Or. 



