^72 



ILLUSTRATIONS OF THE 



/ 



quent alternations of thefe eruptions and depo- 



litions *. 



_ i 



243. Though this hypothefis does certainly 

 liver the fyftem of the Volcanifts from one 



del 



great difficulty 

 able objedions 



is itfelf liable to infurmount- 

 I fliall juft mention fome of 



the principal 



i. Th 



.^ 



g 



an 



we 



ft 



equidiflant fi 



that 



fe 



5 covering the tops of whinftone 

 bafaltic rocks, could not have been depoiited 



oblique and very much inclined pofition 



in the 



which they now occupy. 



This is remarkable in the ftrata which cover 

 the bafaltic rock of Salifbury Crai^, near Edin- 

 burgh, at its northern extremity. The ftrata 

 are very regular, and muft have been depofited 

 in a plane nearly horizontal ; yet the furface of 



i 



the bafaltes on which they now reft is very much 

 inclined, dipping rapidly to the north-eafi. The 



ffit 



f 



h 



depofit 



ft 



hich, though not now horizontal, ha 



pi 



* Near Vizini, in the Val di Note, Dolomieu tells 

 lis, that he counted eleven beds, alternately calcareous 

 and volcanic, In the perpendicular face of a hill, which 

 at a diilance appeared like a piece of cloth, llriped black 



and white : 



Jhp 



In another inftance he faw more 



than twenty of thefe alternations. He ] 

 Similar obfervations in the Vincentine 



m 



Journal de Phyf. torn., xxxvii. (1790), partle 



and in TiroL 





p. 20 



I 



