Notice of Active and Extinct Volcanos. 257 



" 4. We come to a bed D, of a brown color, composed of 

 curved layers, and resembling' by their disposition, their struc- 

 true in the middle, &c. a stratum of concretionary limestone. 



" 5. There follow afterwards some beds of marly limestone 

 very large, very numerous, divided naturally into parallelopipe- 

 dons of which the centre is blackish, and inclosing in E, more 

 nodules of "silex corne" more or less abundant. 



" 6. Below these layers, are found those of the marly lime- 

 stone or calcareous schist, hard, 3 r ellowish, compact, and very 

 fissile, which contains the fossil fish. 



" Des deblais abondans" cover the lower beds here. 



" 6. In descending below these deblais to come to the inferior 

 quarry, we find at first in G, some new layers of marly limestone, 

 among which we have remarked two beds in particular. The 

 upper (o,) is there, brownish, and presents some impressions of 

 very small and almost indeterminable shells ; but which have 

 appeared to me however, to be of the genus avicule. 



" The other bed (&,) larger and very hard, is full of shells, and 

 presents the aspect of a true lumachelle. These shells as far 

 as we are able to observe them, are nummulites, fragments of 

 bivalve shells, and alveolites, which appear to belong to the alve- 

 olites festuca Bosc, &c. 



" These two beds and the very numerous layers which accom- 

 pany them make some curves which are very remarkable, and 

 which the figure indicates. 



" 7. Finally, below their contorted, and shelly layers, a se- 

 cond deposit P2, of ichthyolite presents itself, composed like 

 the one above of veins or numerous fissures of marly limestone 

 or rather of marly schist. Between these beds, divided by a mul- 

 titude of fissures, traversed by veins of calc spar, are found to- 

 gether, the numerous fossil fish and the numerous impressions 

 of plants which are for the most part terrestrial or fluviatile. 



" Lignite in scattered masses at Montechio — Maggoire, in thin 

 beds at Monte-Viale, presents itself here abundantly and often in 

 beds which are very large. We have seen it in thin beds in a vol- 

 canic earthy and fusible breccia in ascending to the quarries I have 

 just described, and we have found it in the same portion in return- 

 ing from those quarries towards Vestena-Nova. 



" Numerous beds, and sufficiently extensive to be quarried, oc- 

 cur at the foot of the isolated and basaltic cone, called la Purgadi 

 Bolcu. These beds of lignite described by M. Bevilacqua Lazise, 

 are inclined from the north west, to the south east, covered and in- 

 tersected also by basanite (volcanic trap, B, L,) and also some- 

 times in immediate contact with the compact and almost prisma- 

 tic basanite: it is surrounded and as it were enveloped with plas- 

 tic clay, white, yellowish, or bluish ; it is covered by a bitumin- 



Vol. XIII.— No. 2. 8 



