



MINERALOGY OP THE ENVIRONS OF PARIS- 



Green marl. No fish. 



Yellow 



[ marl, mix- 

 ed with 

 brown 

 slaty marl. 



Parts of the ray. 

 Ampullaria patula? 

 Cerithium plicatum. 

 cinctum. 

 Cytherea elegens. 



semisulata. 

 Cardium obliquum. 

 Nacula margaritacea. 



Calcarious 

 marl, con- 

 taining 

 large oy- 

 sters. 



Ostrea hippopus. 



pseudochama. 



longirostris. 



canalis. 



Calcari6us 

 marl, con- 

 taining 

 small oy- 

 sters* 



Ostrea cochlearia. 



cyathula. 



spatulata. 



linguatula. 

 Ballanites. 

 Shells of crabs. 



Almost all these 

 shells are broken, 

 and difficult to as- 

 certain. The two 

 species of cerites 

 > of the marine for- 

 mation, which co- 

 vers the gypsum, 

 do not appear to 

 occur any where 

 else. 



The two beds of oy 

 sters are often se- 

 parated from each 

 other by marl with- 

 out shells; and al- 

 though we cannot 

 say with any cer- 

 tainty whether or 

 not the particular 

 species here enu- 

 merated are shells 

 that belong more 

 to the one bed 

 than to the other; 

 yet it cannot be 

 doubted, that the 

 oysters of this marl 

 do not occur in 

 the coarse lime- 

 stone, and that 

 they are more 

 nearly allied to the 

 species at present 

 living in our seas, 

 than to those found 

 in the limestone. 



