HEBERT NTJMMFLITIC AND OLIGOCENE STRATA. 19 



V. Koenen, Pleurotoma turbida, Sol., var. ligata, Edw., P. atienuata. 

 Sow., and Solarium pidchrum, Sow. He then alludes to the diffi- 

 culties occasioned by the anomalous occurrence of certain forms in 

 two distinct beds, when they are wanting in the intermediate bed ; 

 and he concludes with the hope that, although some modifications 

 may hereafter be rendered necessary, in conseqaence of more perfect 

 materials for comparison, the labours of future explorers will be 

 facilitated by the work which he has already done, and the careful 

 comparison he has made. [W. J. H.] 



On the Ntjmmulitic Strata of Northern Italy and the Alps, and 

 on the Oligocene of Germain r. By M. E. Hebert. 



[Note sur le terrain nummulitique de I'ltalie septentrionale et des Alpes, et 

 sur I'oligocene d'AUemagne ; par M. Ed. Hebert. Bull. Soc. G60I. de France. 

 Deuxieme serie. Tome xxiii. pp. 126-144.] 



The Tertiary deposits of the Northern Apennines have been sub- 

 divided by the Marquis Pareto,* in the following manner : — 



EOCEKE. 



1. Etage Niceen. — The Nummulitic limestones of Nice and the 



^ Alps, overlain by great deposits of macignos and flysch. 



2. Etage Ligurien. — Grey macignos, with alternations of lime- 



^ stones and argillaceous schists. 



3. Etage Modenais or Calcaire a Fucoides. — The upper part of 



the last stage where the limestones predominate. 



Miocene. 



1. Etage Bormidien. — Beds of Dego, Carcare, &c., with Nmn^ 



mulites interinedia, with the intercalated lignites and lacus- 

 trine beds of the horizon of Cadibona. M. Pareto ultimately 

 classed in this division all the Nummulitic strata of the 

 , Yicentin and theYeronais, except Monte Bolca. 



2. Etage Langhien. — The marly grey sands, molasse, and ophi- 



olitic sands of the Colline de Turin, characterized by fossils 

 ^ of the Paluns of Bordeaux. 



3. Etage SerravaUien. — Marly, grey, and yellow sands, &c. 



M. Hebert considers it now possible, upon palseontological grounds 

 alone, to arrive at a more precise, and even a more detailed classifi- 

 cation that that of M. Pareto. In 1854, M. Eenevier and the 

 author showed that it was necessary to detach from the great Num- 

 mulitic mass certain beds at Saint-Bonnet and Eaudon, in the High 

 Alps, in the Diablerets in Switzerland, and at Pernant, Entre- 

 vernes, &c, in Savoy, which are overlain by the variegated sand- 

 stone and macignos to which the name of "Elysch" has been given. 

 These beds, to which the term " Terrain Nummulitique superieur," 

 was applied, are more recent than the other beds of the Nummulitic 

 series, and contain fossils characteristic of the Paris " Calcaire gros- 

 sier " and " Sables de Eontainebleau." M. E. Sismonda adopted this 

 distinction, and in the following year discovered a still more recent 

 Nummulitic series in the valley of Bormida. 



* Bull. Soc. Geol. France. Tome Ixxi. p. 245, 



e 2 



