of Serpentine, Sfc. in the Apennines. 179 



of the same nature observed at some distance from each 

 other. But here we have more than at Rochetta, the alter- 

 nation of the limestone and the micaceous sandstone, of a 

 •coarsely aggregated rock with one of a fine deposit (sedi- 

 ment fin), and the whole beneath rocks, the complete 

 though confused crystallization of which indicates an entire 

 previous solution. Such is the third example I have to 

 adduce as to the evident superposition of the serpentines 

 and diallage rocks, crystalline rocks, on compact limestone 

 and micaceous sandstone, rocks of sediment * and aggrega- 

 tion. If any doubts remain on the alternation of these two 

 last rocks, and of the superposition of the limestone on the 

 sandstone, they will be removed by the facts that I shall 

 hereafter expose, when I endeavour to determine the epoch 

 of formation to which these rocks may be referred, and by 

 the exact coincidence of my observations on this last alter- 

 nation with that of M. von Buch. 



§ II. Position of the serpentines in other parts of the 

 Apennines, determined by analogy. 



I shall not pass in review, with reference to the observa- 

 tions I have just made, all serpentines and diallage rocks, 

 in order to compare that which is known respecting their 

 position with what we have learned respecting that of the 

 Apennines : this enumeration would carry me too far away 

 from the principal object of my work ; but I ought never- 

 theless to examine if the position of any well known serpen- 

 tines, and especially those in other parts of the Apennines, 

 presents a disposition contrary to that which I have above 

 made known, or if they are not rather the same. 



I have seen the same serpentine formation, that is to say, 

 the association of serpentine, containing diallage with dial- 

 lage rock, near Monte Cerboli in the Volterranais ; at 

 Mont Ramazzo near Genoa ; at the Bocclietta, on the north 



* 1 have considered it proper to use the author's own word of " sedi- 

 ment," here and elsewhere in this memoir, as I could not otherwise so 

 well convey his meaning. (Trans.) 



M 2 



