256 



Notice of Active and Extinct Volcunos. 



although less high than another quarry situate upon the other 

 side of a very deep valley, is already sufficiently elevated and 

 probably four hundred metres at least, above the level of the 

 Adriatic sea, according to the barometrical measurements taken 

 by M. Pollini, and given by M. Bevilacqua-Lazise. It presents 

 two quarries of ichthyolites placed the one above the other, and 

 has shown me the succession of rocks which I describe from 

 the summit to the last quarry. 



" 1. The summit A, presents brown compact limestone, very 

 much in fragments and disintegrated, but nevertheless in its 

 stratification very distinctly inclined towards the south. 



" 2. In B a bed, (filon-couche) of brown basanite very much 

 in fragments and disintegrated. This bed or vein of basa- 

 nite is very extensive ; we follow it with ease, as far as its 

 position is constant and regular. A little way from the ichthyolite 

 quarry we perceive another bed of it which in its position is 

 absolutely similar to that of the basanite B. 



" 3. Below, are many layers of a compact limestone C, like 

 that which occurs above the basanite. .The layer which touches 

 the basalt is blackish ; the others are dirty white, traversed with 

 veins of calc-spar and by fissures lined with little crystals of 

 lime. 



" The angles of the fissures of these beds are as it were roun- 

 ded, and worn off or corroded on the side of the basalt ; they are 

 moreover much in fragments ; their parts or natural fragments at 

 curved surfaces have a resemblance to large almonds produced 

 by the compression and sliding one upon another of subellip- 

 tical fragments. 



" These layers, much more multiplied than the drawing rep- 

 resents, are almost vertical. 



