430 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 22, 



the protrusion of the mica slate and trias in the basin of Trent and 

 near Recoaro, the upheaval of the Euganean Hills, and of the great 

 tertiary deposit of the Yicentin. The basaltic eruptions took place 

 towards the end of the secondary and during the commencement of 

 the tertiary period. They have been so well described by M. Bron- 

 gniart in his work on the calcareo-trappean rocks of the Vicentin, that 

 I shall only make one remark, which is this, — that the basaltic con- 

 glomerates in many spots have covered the upper chalk, and mixed 

 themselves with the tertiary limestone then forming, so as to make it 

 difficult to separate the two formations ; whilst in other places the 

 basalt is so trifling in quantity as to have formed with the eocene 

 sediment a calcareous grit. For instance, in the Euganean Hills, this 

 grit, containing Operculina complanata, Bast, sp., beds of Nummu- 

 lites, crinoidal stems, and the Pentacrinites didactylus, D'Orb., re- 

 poses on chalk containing Ananchytes tuherculatus, Defr., and Ino- 

 ceramus Lamar cMi, Park. In the Berici Hills these grits pass into a 

 ' calcaire grossier,' containing CeritJiwm giganteum^ Lamk. : at Mon- 

 tecchio Maggiore, at Ronca, and at Bolca in the Veronals, the con- 

 glomerate and limestone contain an enormous quantity of decidedly 

 eocene fossils, which are again met with at Castel Gomberto in the 

 Val di Lonte, and at the base of the whole zone of tertiary hills from 

 Verona to Friuli ; for they have been noticed near Bassano, in the 

 hills of the Asolano, and the hills beyond the Piave. One very in- 

 teresting locality is at the village of Galio in the Sette Comuni, where 

 at an elevation of nearly 3000 feet a limestone with Cerithium gigan- 

 teum is seen to repose conformably on upper cretaceous beds. This 

 junction is also visible near Bassano, along the escarpments of the 

 valley of the Brenta, as pointed out by Sir R. I. Murchison in 1829 : 

 all my observations since have but confirmed the ideas of that distin- 

 guished geologist, as I have acknowledged in a pamphlet and in a 

 note inserted in the Bulletin of the French Geological Society*. 



Another good junction of these formations is at the crest of the 

 hills separating the valleys of the Agno and the Schio. Descending 

 from these hills towards Magre across conglomerates and nummulitic 

 beds we come upon a brick-red limestone resembling the scaglia, but 

 containing small Nummulites, which by degrees disappear, and in 

 their place we find Ananchytes and Inocerami proper to the chalk. 

 Turning to the south to the hills of San Malo, and descending to 

 Ennichilina, we come upon a bed full of Nummulites of various sizes, 

 from a breadth of three to forty-five millimetres ('118 to 1*77 inch) 

 and a thickness of two to eight millimetres ('078 to '314 of an inch). 

 As usual the smaller are the thickest, for the larger are scarcely two 

 millimetres in thickness. MM. de Verneuil and d'Archiac, to whom 

 I sent them, think they can distinguish amongst them the globular 

 variety oi Nummulites Biaritzana, D'Archiac, and refer the largest 

 to N. polygyratus, Desh., and N. distans, Desh., of the Crimea. 



* See observations on the Jurassic, cretaceous, and nummulitic rocks of the 

 Venetian Alps, in the memoir on the Alps, Apennines, and Cai'pathians, by Sir R. 

 I. Murchison, Quart. Journ. Geol. Soc. vol. v. pp. 179, 218 et seq., and Sections, 

 pp. 218, 219, &c. 



