2 TRAVELS THROUGH 



inundations have very often by newer ftratas (ftratti 

 tertiaria) buried arid covered all the old volcanic 

 devaftations ; and new eruptions from under 

 ground fucceeded afterwards. Hence it is obvi- 

 ous, that many fuch accidents may have happened 

 by turns in the cburfe of feveral thoufand years - 9 

 and that the confequence of thenl ought to have 

 been, a fingular mixture and cbnfufion of marine 

 and volcanic materials. Therefore, we are not to 

 wonder if petrifactions are found in the lava and 

 volcanic a'mes, as has been noticed in feveral 

 places before, and efpecially in the defcription of 

 Monte Ronca. A coal-bed may very cafily have 

 been furrourided by the fluid lava 5 and luch a one 

 is in Monte Vide in the Vicentine diftricl:. Hence 

 too arofe whole ftrata of breccie, or mixtures of 

 lava, marble, and limeftone; which offer them- 

 felves in Monte Ronca and the following places. 



Lo SpiJJb di Tdnnefa, a calcareous rock belong- 

 ing to the Vicentine Alps, mews on one of its 

 fides a large perpendicular fifiure, which goes 

 down into the deep torrent Aftico, and is filled 

 with a fort of marble ; which has a great refem- 

 blance to the Breccia Africana, but confifis of a 

 mixture of white faline and fi'ne marble-fragments, 

 cemented with black lava. It takes a fine polim. 



The fame la*ua Irecciata offers itfelf near that 

 place in Valle d'EriofredO) and more to the wed- 

 to wards- 



