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HUTTONIAN THEORY. 



3^9 



graving 



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They traverfe the flrata in va- 



rious dire(5lions, and inclofe pieces of the mi- 

 caceous fchiftus ; and, from the great number 

 of ioofe blocks which he found, exhibiting por- 

 tions of fuch veins, it is probable, that they 

 are very numerous in this quarter. The fame 



Hiincialoaift mentions fome inilances of fimilar 



P m I 



veins in the Shetland Ifles f. 



r 



In Rofs-fhire, Sir George Mackenzie has ob- 

 is ferved a great variety of granite veins, fome of 

 them of large lize. Qne of them, in particular, 

 not far from Coul, when firfl difcovered, was 

 fuppofed to be a lingle mafs, riling from under 



r 



the fchiftus ; but, on a more careful examina- 

 tion, has been found to be a part of a great 

 fyltem of veins, which interfefts the micaceous 



r ■ 



fchiftus of this tracl in various directions. 



286. The granite veins are not the only proof 

 that this (lone is more recent than fome other 

 produaions of the mineral kingdom. Speci- 

 mens of granite are often found, containing 

 round nodules of other ftones, as, for example. 



\ 



of gneifs or micaceous fchiftus. 



Such is the fpe- 



cimen of granite containing gneifs, which Wer- 

 ner himfelf is faid to be in poffefllort of, and 



to 



# 



Mineralogy of tjie Scottilh Ifles, vol. ii. p, 173 



f Ibid, p . 2 1 6. 



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