224 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DeC. 13, 



fell under my own notice, Cerithium giganteum, Cerithium Mara- 

 schini (Brong.), (which M. Ewald assures me is the C. liexagonum 

 (Brug.) of the Paris basin), Crassatella sulcata (Sow.), Nerita co- 

 noidea, Bulla Fortisii. Among the conchifera are the Pholadomya 

 Puschii ? (Goldf.), the Cardium Theresce of Nice, whilst the Spon- 

 dylus cisalpinus (Brong.) and certain Pectens are as common as in 

 the nummulitic rocks of the Northern Alps. The Echinoderms of 

 this tract are equally decisive of a supracretaceous deposit ; for they 

 chiefly belong to the genera Schizaster, Scutella and Echinolampas, 

 which are unknown in the chalk, but which also occur in the num- 

 mulitic deposits of Switzerland and Bavaria. 



In an excursion through the lofty table-land of the Setti Communi, 

 I saw the lowest tertiary beds, containing Cerithium giganteum as 

 well as nummulites, reposing conformably on slightly inclined strata 

 of the red and white chalk or scaglia at the height of about 5000 

 feet above the sea. This position is expressed in the diagram (fig. 22), 

 which shows how the same movements of elevation and undulation 

 which threw the lower tertiary group into a vertical position on the 

 external flank of the cretaceous rocks at Bassano, had raised fragments 

 of it at Gallio, near Asiago, on the surface of similar rocks amid the 

 summits of the adjacent mountains. Again, in the Kalisberg moun- 

 tain which overlooks the city of Trent on the east, the uppermost 

 cliffs of sandy yellow limestone, which at a distance weather like 

 dolomites, were found by MM. von Buch, de Verneuil and myself to 

 be nummulitic rocks overlying the Jurassic and cretaceous systems*. 

 In these strata we collected \\\^ Nerita conoid e a diwd^ Voluta amhigua, 

 well-known species of the calcaire grossier of Paris, together with 

 the Lucina Corbarica (Leym.), and several species of Echini, in- 

 cluding the Eupatagus ornatus (Desor), the Echinolampas suhsi- 

 milis (D'Archiac) and the Pygorhynchus subcylindricus (Ag.), 

 both of Biaritz, and the Echinocyamus profundus (Ag.) of the 

 nummulitic rocks of the Swiss Alps. At Sardagna (Trent) on the 

 opposite bank of the Adige, the nummulitic limestone with Echini, 

 Crustacea, Pectens, and the Sjwndylus cisalpimis so well known 

 at Castel Gomberto, &c., also overlies white inoceramus limestone ; 

 thus exhibiting precisely the same succession as at Sonthofen and 

 many other places in the North-western Alps. These nummu- 

 litic beds, according to M. Perini, occur also at the height of not 

 less than 7000 feet above the sea, in the peak of IMonte Bondone, 

 to the south-west of Trent. The same tertiaiy deposits, therefore, 

 fl^hich form mere hillocks on the south flank of the Alps, and which 

 in some places (Bassano, &c.) are raised conformably into vertical 

 walls, flanking the cretaceous rocks, have been carried up to great 

 altitudes within the chain, where they bear the same relation to the 

 cretaceous formation as the nummulitic rocks and flysch of Switzer- 

 land and the Northern Alps. 



* In the museum of M. Menapace, of Trent, we observed the Inoceramus my- 

 tlloides and Terebratula subglobosa of the chalk, which that zealous collector, as 

 well as M. Perini, who accompanied us to the Kalisberg, assured us were inva- 

 riably found under the nummulitic rocks. Most of the fossils above cited were 

 found by M. Menapace. 



