UPWARE AND BRICKHILL NEOCOMIANS. 69 



Ardennes are truly the representatives, in part at least, of our 

 Upware, Potton, and Farringdon sand and Pebble beds. 



In the central area of the Paris Basin the precise horizon of our 

 Phosphatic beds does not appear to be so clearly indicated. Much 

 discussion has been carried on as to the age of the Atherfield beds 

 with reference to the Parisian series; but all agree that the upper 

 beds of the Yectian area, to which our phosphatic series pertains, 

 are of Aptien age; and according to M. Barrels the Farringdon 

 beds might be identified with the Argile a pUcatules of the Haute 

 Marne. 



In Switzerland the Neocomian fossils have been admirably 

 worked out in the magnificent monographs of MM. Pictet, de 

 Loriol, Renevier, and Campiche, and we find a considerable number 

 of our species are there described and figured. Thirty-one species 

 are common to the Upware and Brickhill beds and the Lower 

 Cretaceous of St Croix. 



To the North of Geneva, and at Mont Sal^ve, we have the 

 Jurassian type of Lower Cretaceous which is divided into the 



(4) Aptien or Upper Neocomian. 



(3) Urgonien or Middle Neocomian. 



(2) Neocomien or Lower Neocomian. 



(1) Valengien. 



The Yalengien deposits are known with certainty only over a 

 very limited area; and its fossils as developed at d'Arzier (Vaud), 

 have been worked out by M. de LorioP. Amongst them we find 

 seven species of Upware fossils, including Janira atava, Roemer; 

 Opis Neocomiends, d'Orb.; Waldheimia pseudojurensisy Leym. 



As examples of the Swiss Neocomian we may take the Mont 

 Saleve or Landeron sections. From the Marnes d'Hauterive (Lower 

 Neocomian) of Landeron twelve native Upware species are recorded 

 besides two of our derived Neocomian shells, namely : 



^ PalcBontologie Suisse, Vol. IV. 



b 



