204 



EcHINODEKMATA. 



Collyrites elliptica, Ag. Pseudodiadeina coiuplanatum, Ag. 

 Pygurus Marmonti, Ag. " superbum, Ag. 



Holectypus striatus, d'Orh. " calloviensis, d'Orh. 



Polycyphus textilis, Ag. Millericrinus Beaumontianiis, o'Orb. 

 Pedina Gervillii, Ag. » nodotiauus, (TOrh. 



Storaecliinus calloviensis, Cott, " sub-echinatus, d'Orb. 



Acrosalenia radians, Z'esor. " aculeatus, rf'OrJ. 



II. — The inarnes ferrugineuses oolithiques, a Ammonites 

 cordatus, Am. perarmatus, Am. oculatus, &c., appear to correspond 

 with some of the inferior beds in our lower calcareous grit. 



III. — The marnes grises et calcaires gris cendres avec couches 

 de Spongiaires, consist of calcareous nodules in a similar matrix 

 a few feet thick, containing many Anthozoa and Spongia of 

 large dimensions. The fossils are very niunerous and well 

 preserved, they consist of Ceriopora striata, Goldf., C. angulosa, 

 Goldf., Scyphia obliqua, Goldf., S. pertusa, Goldf., 8. paradoxa, 

 Miinst., Asterias scutata, Miinst., Cidaris Blumenhachii, Miinst., 

 C. marginatus, Goldf., G. coronatus, Goldf,, Trigonia claveUata, 

 Sow., Pecten suhtextorius, Miinst., Terebratula hucculenta, Sow., 

 T. pectunculus, Schloth., T. tetragona, Eoem., Ammonites canali- 

 culatus, Miinst., Am. Eenrici, d'Orb., Am. Eucharis, d'Orb., 

 Belemnites Royerianus, d'Orb., &c., &c. 



lY. — The calcaires pseudo-lithographiques, a Pholadomya 

 ampla, pass into — 



Y. — The highest terrains which extend throiighout the 

 northern part of the arrondissement, and are composed of the 

 marnes superieures a grandes Amm. plicatilis, et Pholadomya 

 parcicosta. According to M. Beatjdotjin* this zone is nearly 

 100 metres = 328 feet in thickness, and contains some beautiful 

 crystals of the metastatique carbonate of lime, balls of calcareous 

 marls, very analogous to the chailles of the Franche-Comte, 

 and probably on the horizon of those of I'Yonne. The fossils 

 are not numerous, and those which retain their test have 

 passed into a siliceous condition. The leading specimens are 

 Gryphcea dilatata, Sow., PJioladomya parcicostata, Ag., Trigonia 

 claveUata, Sow., Melania striata, Sow., Ammonites plicatilis. Sow. 



* Bulletin de la Soc. Geol. de France, Ire Serie, t. xiv, p. 155 : 1842. 



