178 



POLYZOA. 



Berenicea diluviana, Lamx. Berenicea microstoma, Haime. 



Stromatopora Terquemi, Haime. 



ECHINODERMATA . 



CoUyrites oralis, LesJce. Hyboclypus gibberulus, Ag. 



11 rino-ens, Ag. Pseudodiadema depressum, Desor. 



Clypeus Plotii, Klein. Magnosia Forbesii, Wright. 



Holectypus hemisphcericus, Desor. Cylocrinus rugosus, d'Orl. 



In the Cote-d'Or the Inferior Oolite is essentially the same 

 as in the preceding section, and is divisible, in descending order 

 according to M. Martin, into — 



1. Calcaire fissUes a Gervillies = to tbe Calcaii-es a CoUyrites ringens. 



2. Calcaire Polypiers. 



3. Calcaire a Entroques, a Peden Bajocencis. 



4. Calcaire marbre inferieur, a Ammonites Miirchisonw, et Peden per sonatus. 



5. Feuillet grezeux, a Chondrites scoparius. 



M. L. GuiLLEBOT DE Nerville in his Legende explicative* 



groups the Inferior Oolite, under the general name Calcaire a 



Entroques, and divides it thus : — 



'ts «• ("Calcaire schistoide silicieux. 



1^ s I Bancs tres riches en polypiers, quelques uns etant sub- 

 i ^"S oolitliiques et s'enlevant par laves. 



-^ "I I Calcaire a Entroques proprement dit, compaote grisatre 

 ^ 1^ 1_ ou bien ferrugineux et roussatre. 



Such being the case, I now proceed to correlate these divisions 

 of the etage Bajocien of central France with the Inferior 

 Oolites of Gloucestershire. 



I have proposed to divide this formation in our district into 

 three zones : — 1st the Inferior, or zone of Ammonites Murchisonce, 

 in many cases resting upon the sands of Upper Lias, containing 

 Ammonites opalinus. 2nd the Middle, or zone of Ammonites 

 Humphriesianus, and 3rd the Upper, or zone of Ammonites 

 Parhinsoni and CoUyrites ringens. We shall see as we proceed 

 how exactly these sub-divisions agree with those of M. Martin 

 and M. de Ferry, already enumerated in detail. 



* Legende explicative de la Carte Geologique du Departement de la C6te-d'0r. 

 1853. 



