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HUTTONIAN THEORY. 



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29 



4 



?.nme of the Nova Ada of Peterfburgh, (tab. 12.), 

 the diredlion of the flrata is nearly from N. to Si 

 This laft is probably the diredion in the great 

 chains of South America ; fo that the uniformity 

 of diredion in the primary ftrata, which fome 

 mineralogifts would extend to thofe of the whole 

 earth, is certainly imaginary, though there can 

 be no doubt that it extends over very large por- 

 tions of the earth's furface *. 



207. The 



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* It is perhaps unneceffary to obferve, that the two 

 propofitions, that the interfedions of the ftrata with the 

 horizon are parallel lines j and that they are lines which 

 preferve the fame bearing with refpedl to the points o£ 

 the compafs ; are nearly the tame thing for tra6ts of 



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rtioderate exterlt, but for large portions of the earth's 

 furface are extremely different. If, for inilance, the 

 belt of primary vertical fchiftus, which traverfes the 

 fouth of Scotland, were to be produced eailward in thd 

 fame plane, from its northern extremity, where its di- 

 te6tion is E,N. E. and its latitude 55^.57', it would 

 "cut the meridian always lefs obliquely as it advanced, 

 till, having increafed its longitude about 260.28', it 

 Vvould be at right angles to the meridian^ and its direc- 

 tion of coiifequence due call and weft. This would 

 happen in the parallel of 580^51', (on the fliore of the 



Gulf of Finland, near Revel), the ftrata being now ex- 

 tended about 880 G. miles from the Siccar Point. Con- 



Verfely, vertical ftrata 



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having the fame bearing with 



refpefl: 



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