74 



ILLUSTRATIONS OF THE 



diflant parts. Few fadls, in the hiftory of foffils 

 are more remarkable than this, and none more 

 diredlly affimilates the operations of the mineral 

 regions, with thofe that take place at the furface 

 of the earth. 



69. Again, the difturbance of the ftrata 

 wherever veins of whinftone abound, if not a 



r 



dired proof of the original fluidity of the whin- 

 Hone, is a clear indication of the violence with 

 which it was introduced into its place. This di- 

 fturbance of the poiition of the ftrata, by ftiift- 

 ing, unufual elevation, and other irregularities, 

 where they are interfe6led by whinftone veins, 

 is a fadt fo well known to miners, that whea 

 they meet with any fudden change in the lying 



r 



of the metals, they are wont to foretel their ap- 

 proach to mafles, or veins of unftratified matter ; 



and, in their fig 



language, point them 



out as the 



thev 



fes of the confufion with 



hich 



fo generally accompanied 



The mi 



neral veins likewife, as well as the ftrata 



fte 



heaved and ftiifted by the veins of wh 



ft 



70. Whinftone of every fpecies is found fret 

 quently interpofed in tabular mafles, between 

 beds of ftratified rocks • and it then adds to the 



indications 



* A ^rouB/e is the name which t 



country give to a vein of whinftone 







A 



