286 MINERALOGY OF THE ENVIRONS OP PARIS. 



the gypsum, as will appear from the following enumera- 

 tion. 



Shells found in the Upper Marine Sandstone* 

 Oliva mitriola. 

 Fussus ? allied to longasvus. 

 Cerithium cristatum. 

 lamellosum. 

 mutabile ? 



Solarium ? Lam. PI. viii. fig. 7. 

 Melania costellata ? 

 Melania? 



Pectuneulus pulvinatus. 

 Crassatella compressa. 

 Donax retusa? 

 Citherea nitidula. 



laevigata. 



elegans ? 

 Corbula rugosa. 

 Ostrea flabellula. 



This formation, and the one preceding it, although 

 arranged by Cuvier and Brongniart as distinct forma- 

 tions, are evidently members of one and the same forma- 

 tion. 



NINTH FORMATION. 

 '.#&':: '.-, '&-.&:*: ^;. ^J^^r^^U %** 



Millstone without Shells. 



This formation consists of iron-shot clayey sand, green- 

 ish, reddish, and whitish clay marl, and millstone ; and al- 

 though separated by Cuvier from the flint and siliceous 

 limestone formation, appears to be a member of that se- 

 ries. This millstone is a quartz, containing a multitude 

 of irregular cavities which are traversed by siliceous 



