232 



The middle stage,or argiles glauconieuses a Cardium Morimcwn, 

 et Ostrea expansa, is 30 metres in thickness and contains 

 Ammonites hiplex, Gidaris Boloniensis, Acrosalenia Konigii. 



The upper stage, or gres a Trigonia gibhosa and Tr. incurva, 

 from 8 to 10 metres thick, was identified by Dr. Fitton as the 

 equivalent of the Portland stone of England; it contains, 

 likewise, ^mmow/es giganteus, Cardium Pellati, Serpula coacervata, 

 Pecten lamellosus, Echinohrissus Brodieii, Echinohrissus Haimii, 

 Natica Ceres, Astarte sociales. This stage forms the summit of 

 the cliff, where it is well exposed ; likewise at Mont de Couple, 

 Talaise d'Alprecht, and at la Butte de Ningle. I have en- 

 eavoured to epitomise the admirable section given by M. 

 Pell AT, in the following table : — 



(^See opposite page. ) 



