SUCCESSION AMONG ROCKS. 285 



and even to multiply some of the alternations, be 

 would probably find justifiable cause in tbe examina- 

 tion of the ground itself. 



It is extremely rare to find, in Scotland, any series 

 so numerous or so easily reduced to the supposed or 

 hypothetical order. The following, from different 

 parts of the central districts, or from Perth, Inverness, 

 and Aberdeenshires, are much more common. Gra- 

 nite here is followed in this manner, taking first the 

 most numerous series, and, in a similar way, omitting 

 the minor alternations. 



Gneiss and Limestone 



Limestone Quartz Rock 



Quartz Rock Hornblende Schist 



Gneiss Gneiss 



Micaceous Schist Micaceous Schist 



Argillaceous Schist, Gneiss 



Argillaceous Schist 



the lowest red sandstone of the secondary class suc- 

 ceeding. 



Detailing more minutely two examples from the 

 same places, they afford the following order, and in 

 such a manner that it seems impossible to associate the 

 different strata in groups or subordinations, at least 

 in many cases. 



Gneiss Limestone 



Limestone Gneiss 



Hornblende Schist Hornblende Schist 



Quartz Rock Micaceous Schist 



Limestone Gneiss 



~ , more than once 

 Gneiss Quartz Rock 



Limestone Limestone 



Micaceous Schist Micaceous Schist 



Chlorite Schist Gneiss 



Hornblende Schist ' ace < S ^ St I more than once 



Limestone Chlorite Schist S 



Micaceous Schist Argillaceous Schist 



