﻿70 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Dec. 18, 



oolite of the Vendee and of other districts of France, while Ammonites 

 annulatus (which is not to be confounded with the species of the 

 same name described by Schlotheim) belongs, according to Sowerby 

 (Mineral Conchology), to the lower lias, and according to D'Orbigny, 

 to the upper lias, which last would be equivalent to our upper epio- 

 litic limestone. 



Ammonites of the Inferior Epiolitic Limestone, 



Ammonites perarmatus*, Sow. tab. 1. fig. 4. 



biplex, Sow. tab. 11. fig. 3 a, b. 



annulatus, Sow. tab. 11. fig. 2 a, b. 



■ linguiferus, oVOrb. tab. 1. fig. 2 a, b. 



Fontana, Cat. tab. 2. fig. 1 a, b. 



Toblinianus, Cat. tab. 2. fig. 4 a, b. 



strictus, Cat. tab. 4. fig. 2 a, b. 



■ — — Albertinus, Cat. tab. 2. fig. 3 a, b. 



quinquecostatus, Cat. tab. 3. fig. 8. 



contiguus, Cat. tab. 4. fig. 2 a, b. 



Benianus, Cat. tab. 2. fig. a, b. 



— — exornatus, Cat. 

 You, Sir, have placed the limestones, of which we are speaking, in 

 the second group of the Jura-system, consisting of the Oxfordian 

 rocks f, and not rather in the first group, which embraces the Port- 

 land limestones, which may be in fact considered as the true repre- 

 sentatives of the upper jurassic formations of Brongniart, to which 

 the chalk-formation immediately succeeds. Without involving my- 

 self in discussions, in order to decide to which of the three groups 

 the epiolitic formation of the Venetian Alps belongs, I shall only 

 observe that some of its fossils have their equivalents in the coral 

 rag, which is one of the members of the upper group established by 

 the English school. The reasons that forbid our considering the 

 inferior part of the said group as an equivalent of the coral rag, 

 have been given by you in your " Sketch of the Oolitic Formations 

 of Germany J." 



If, from the position of the lower red limestones of the Venetian 

 territory, we may conjecture that they are nearly allied to the coral- 

 line limestone of other countries ; on the other hand, they differ from 

 it by being destitute of zoophytes. The few that I possess, and of 

 which I shall give figures in the work on Fossil Zoophytes that I have 

 now ready for the press, may be referred to the order of Spongiaria, 

 and they come from the upper epiolitic limestone of the district of 

 Bergamo. 



The other fossils, besides Ammonites, occurring in the rocks of 

 which we are speaking, are various species of the genus Inoceramus, 



* These species I have always found in the lower beds of the Epiolitic forma- 

 tion, and are figured and described by me. Plates 1, 2, 3, 4, are still unpublished ; 

 the others are inserted in the ' Prodromus,' 1847. 



f Quart. Journ. Geol. Soc. vol. v. 1849. 



% Proceedings of the Geological Society, May 1831. Sir R. I. Murchison de- 

 sires the Editor Q. G. J. to observe, that he has long since abandoned this opinion. 



