^54 ILLUSTRATIONS OF THE 



melted matter iniecT:ed from the mineral 



egion 



226. Mine 

 terfedlions vv: 

 marks of the 

 bance, (§ 56) 

 their 



clefts and fiifures of the ftrata (§ 59.) 



particularly 



their 



in- 



th one another, contain abund 



ft violent 



d repeated dift 



Not to mention that they 



iir firft formation to the frad _ 



placing of rocks already confolidated 

 pears, 



and dif. 



It 



that they have 



ap 



ated at very difFe 



periods, and that the birth of each has been 

 accompanied with convulfions, which fliook the 



foundations of the earth 



ftanc 



In Cornwall, for 



th 



principal veins, and thofe which 



they diftinguifli particularly by th 



L c des 



i name of 

 rly the fame diredion with the 



ftrata or vertical fchiftus, extending from abo 



N. E. to W. S. W 



Thefe, how 



ten 

 mil 



fe cl e d 



of 



rly at right 



by 



veins, called Crofs Courfes, and th 



diy ever hap 



<i 



ns wi 



dired 



died, heaving the former out of theii 

 This plainly indicates, that the crof: 



f 



g 



than the others, and 



that their formation was accompanied with fuch 

 a force, as muft, in many inftances, have moved 

 the whole body of' rock which conftitutes the 

 promontory of Cornv/all, and probably much 

 more, for feveral yards, in a horizontal direc- 



Sometimes, alfo, both the longitudinal 



and 



