ACCOUNT OF THE OLD RADNOR GROUP CONCLUDED. 



323 



than the phenomena of the Val di Fassa, these of Old Radnor serve to explain more 

 clearly how shelly stratified deposits have been elevated, dislocated, and altered by the 

 intrusion of volcanic matter. Yet this interesting spot, which is also so attractive to 

 every lover of fine scenery from the varied and picturesque outline dependent upon 

 geological structure, and exhibiting in the composition of its trap rocks the mineral 

 called hypersthene, formerly supposed to be peculiar to one district only of Great 

 Britain, has never elicited any scientific description, although within one hundred and 

 fifty miles of the metropolis 1 . 



1 It appears from recent observations of M. de la Beche that hypersthene rock exists also in Devonshire. 



