T. Davidson — Continental Geology. 257 



fauna of Berrias, and M. Zeuscher's researches on the Nerincea, 

 and that of Sig. Gemellaro on the fauna of the horizon of Tereb. 

 janitor at Palermo, seem to denote on the contrary Jurassic affinities. 

 I do not consider myself justified in denying the correct foundation 

 of the identifications arrived at by these eminent palasontologists, 

 and I consequently wait for a renewed discussion with regard to 

 those species. 



"From what I have already said, I am prepared to accept the 

 idea of the Stramberg limestone being a portion of the Cretaceous 

 system, but I shall only accept it as such when supported by satis- 

 factory evidence, and this I repeat we do not at present possess. 



"The fauna of the Klippenkalk (Carpathians) and that of the 

 ' Eosso-Ammonitico ' of the Tyrol are almost contemporary with 

 those of Stramberg, and characterised by the true Terebratida dijjhya. 



"As to the Stramberg fauna, the list of the fossils will be found 

 in the works already quoted. The most marked are the Tereb. 

 janitor, Ammonites jptychoricus, A. Leibigi, etc., Nautilus Geinitzi, N. 

 Picteti, etc. 



" No. 2. — Loioer Neocomien or Valangien. Below the true 

 Neocomien some lower beds are found, which it is not easy to 

 correlate entirely, because they exhibit difierent facies. In the 

 Swiss and French Jura two beds are in general observed in the 

 Valangien, connected by a considerable number of well known 

 species. The upper or limonite is the richest (see the Memoir of 

 M. Jaccard relating to the map of Switzerland, and where at p. 164 

 upwards of 250 si^ecies are mentioned) the principal fossils of the 

 Valangien are Ammonites Mar cousiana, A. Gevrilianus, A. Desori, etc., 

 Natica leviathan, Pygurus rostratus, etc. In the south of the basin 

 of the Ehone we find again this same bed characterised by Natica 

 leviathan. Beneath it is the beautiful fauna of Berrias, which I 

 described in the ' Melanges Paleontologiques, No. 3 ;' it forms a 

 curious transition between the true Neocomien and the limestone of 

 Aizy (Stramberg limestone). 



"No. 3. — Is an intermediate bed which some geologists connect 

 with No. 2 and others with No. 4. In the Swiss Jura it con- 

 tains Sponges and Bryozoa and is believed to be Yelangien. In 

 the canton of Berne, and in the valley of the Ehone, this bed seems 

 to be replaced by marls with a well defined horizon, containing 

 Ammonites Qrasianus, A. asperrimus, A. Neocomiensis, etc. 



"No. 4. — The true Neocomien appears in two forms. A, the 

 littoral, or shore facies, is spread over a large portion of France, the 

 Jura, etc., and is divided according to the localities into two or thi-ee 

 beds. The upper one is the 'Yellow Stone of Neufchatel,' the 

 middle one is the ' Marls of Hauterive.' It is possible- sometimes to 

 separate from these last a lower bed with Ammonites Astierianus. 

 The characteristic fossils are very numerous : — Belemn. dilatatus, 

 B. jpistilliformis. Ammonites radiatus. Am. Leopoldinus, etc. 



B, the Alpine facies forms a long layer or band extending from 

 the south-east of Germany and Switzerland to the maritime Alps, and 

 returning through the Veronals. It is this facies which contains the 



VOL. VI.— NO. LX. 17 



