1898] 



AMI AX AND CENOMANIAN TN FRANCE 



100 



In the above list there are 38 named species, and of these no 

 fewer than 27 occur in the Lower Gault of the same place, which 

 is in the proportion of 71 per cent., while only 7 or 8 (about 20 per 

 cent.) range into the Cenomanian beds above. D'Orbigny, it therefore 

 appears, was perfectly right in classing the Upper Gault as Albian 

 and there is no necessity for revising the lists of the Albian fossils 

 given by him in his " Prodrome." It is Messrs Barrois and Dollfus 

 who have made a mistake by classing the Upper Gault as Ceno- 

 manian without a sufficient study of its fauna. 



Turning now to England, let us choose localities which corre- 

 spond most nearly with Wissant and with l'Argonne ; it is generally 

 admitted that the Gault of Folkestone is an expansion of that of 

 Wissant, and it will not be denied that the Gaize of Devizes 

 resembles that of Argonne. 



I have made a list of the fossils of the Upper Gault of 

 Folkestone, basing it on that of Mr Price (Quart. Journ. Geol. Soc, 

 Loud., 1874) supplemented by his later record in 1870. Selecting 

 the Mollusca and neglecting other fossils, I find that the Upper 

 Gault has yielded 103 named species; of this number 54 occur 

 also in the Lower Gault, while only 20 range upward into the 

 (liloritic Marl and Lower Chalk (Cenomanian) of Kent. Here, 

 therefore, the zone in question has a much more decided affinity 

 with the beds below than with those above. 



Passing to the Gaize of Devizes my lists are not quite complete, 

 but they include 02 species of Mollusca, and no less than 44 of 

 these do not range out of the zone of Am. rostratv.s (or infiatus), but 

 36 occur in the Lower Gault of Wiltshire and Folkestone, while 

 only 18 range into the Warminster sand, and 20 into the Lower 



