^ 



to 



ki 



e.,> 



il 



as 



I 



k 



'^^ t 



e 



\ 



ii 



Q 



i 





'li 







tlie k 



imi 



i)>" 



3ieces 



»i 



'iKf; 



s 



llDgl 



riF 



;ert2icl 



:iencf|J 



1} 



bijoif 



jlHi 





HUTTONIAN THEORY. * 



271 



pted lavas, and what parts are of 



ed or unert 



doubtful fGrmation, ^ containing no marl; 



which they may be referred to the one of thefe 



a work would 



more than to the oth 



Such 



ry materially to illuftrate 



I hiftory ot the earth. 

 242. One of the moil 



g 



fupp 



th 



volcanic theory, is th 



ttempti 

 fyftem 



f 



fubmarine volcanoes, imagined by the celebrated 



mineralogift D 



The phenomenon th 



led to this hypothelis, was what he had obferved 



^ 



in the hills near Lifbon, and ilill more remark- 

 ably in thofe of the Val di Noto in Sicily, where 

 thebafaltine rocks had regular ftrata incumbent 

 on them, and in fome cafes interpofed or alter- 

 nated with them*. It feemed from this evi- 

 dent, that the ftrata were of later formation than 



th 



fto 



on 



ft 



hich they refted 



d as they 



on 



iited by 



ry fuppofition, be held to be depo 



it was concluded, that 



out by 



th 



a 



the 



which they covered had been throwi 

 volcanoes at the bottom of the fea ; 

 ftrata had afterwards been depolited on this la- 

 va ; and that, in fome cafes, there had been fre- 



quent 



* Memoire de Deodate de Dolomieu, furies Vol- 

 calns Eteints du Val di Noto, en Sicile. Journal de, 

 Phyf. torn. XXV. (1784. Sej^tembre.) p. 191, 



^^' 



