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HUTTONIAN THEORY. gi^ 



traced within a few yards of each other, but 

 not to the actual contad : the beds of fandftone 

 nearell the fchiltus form as ufual a breccia, load- 

 ^t ed with fragments of the primary rock. The 



^\ fecondary rock, which begins here, continues 



for about fifty miles fouth, to Girvan in Ayr- 



ihire, where the primary fchiftus again rifes up, 

 but is not .feen in contact with the fecondary. 

 ^ It extends to the Mull of Galloway and the 

 fliores of the Solway Frith. 



noFt^ The Ifle of Arran, however, not far diftant 



)n4 from this .part of the coaft, contains a jundion 



at its northern extremity, Avhere fecondary ftra- 

 ta of limeflone lie immediately on a primary 

 Qfl[ micaceous fchiftus. This is defcribed by Dr 



Hutton, and was the firfl phenomenon of the 

 kind which he had an opportunity of examin- 

 ing *. The junction is vifible but at one fpot, and 

 is not feen fo diftindly as in fome of the inflances 

 juft mentioned ; but the great quantity of pud- 

 ding ilone near it, renders it more interefting 

 than it would be otherwife. As the greater 

 part of this little ifland is furrounded by fecon- 

 dary flrata, other jundions might be expeded 

 , to be vifible. 



194. On the coaft of England and Wales, from 

 the Solway Frith to the Land's End, though there 

 are feveral alternations from fecondary to pri- 



O 4 mary 



ill ' * 



Theory of the Earth, vol. if p» 429^ 



•ft 



■t 





