92 GRANITE. 



ever position, I must mention these instances; though, 

 for want of correct views, the ohservations which I 

 shall quote from authors are of little value. 



In Sky, where I first described this fact, it forms a 

 considerable mountain, the subjacent strata belonging 

 to the lias limestone: while it is an unquestionable 

 member of the trap family ; because it is connected 

 with rocks, which, in some place or other, contain 

 every member of it that has been described. In con- 

 firmation of this fact, Mazzari is quoted by Breislak, 

 for granite lying, not only on secondary (Jnra) lime- 

 stone, but on the marine alluvia of Italy, formerly 

 mentioned. But this requires some explanation ; be- 

 cause even trap has not yet occurred of so modern a 

 date, in any part of the world. It might be wrong to 

 suggest that this is a volcanic rock; a volcanic gra- 

 nite ; yet if rightly examined it can be nothing else. 

 Had it even been thus deposited on these alluvia while 

 under the water, it is but a submarine lava ; though 

 it is evident that this is the precise case in which lava 

 and trap become the same thing. Whatever may be 

 the fact, however, as to this part of the observation, 

 it is admitted by others who have examined the spot 

 near Predazzo, that this granite does lie above the 

 Jura limestone ; while it is no less important to know 

 that it presents numerous varieties, and passes into 

 porphyry and augitic greenstone. At the same time, 

 the strata in contact, consisting of the red marl, or 

 variegated sandstone, the muschelcalk, and the oolithe 

 and lias, are in some places, modified, and, in others, 

 formed into breccias by the consequences of its intru- 

 sion. Granite has also been found by Von Buch in 

 Norway, lying on secondary limestone ; as confirmed 

 by Haussman. Being described as connected with 

 porphyry, it is probably analogous to that of Sky. 



