SUCCESSION AMONG -ROCKS. 287 



In the following, all the primary strata are wanting, 

 so that the granite comes into contact with the secon- 

 dary. 



Granite Granite 



Old red Sandstone Coal series, or Oolitlie and Lias g/ x /;/ 



In Aberdeenshire and Caithness with Lignites 



In Sutherland, and the Western 

 Islands &c. 



I shall terminate these illustrations by naming some 

 examples where the following strata occur in a suc- 

 cession of alternations so extremely numerous, that 

 it is fruitless to draw out a list of them, as I should 

 scarcely know where to cease. 



In the quartzose isles of the West of Scotland, or 

 the chain of Jura andlsla, these alternating substances 

 are. 



Micaceous Schist 



Fine Argillaceous Schist, or clay Slate 

 Micaceous ditto, or fine Graywacke 

 Arenaceous ditto, or coarse Graywacke 

 Conglomerate ditto, or coarsest Graywacke 

 Quartz Rock. 



In the series which terminates the Highland moun- 

 tains towards the low country, and in a similar series 

 in Argyllshire within the micaceous schist, the fol- 

 lowing beds alternate in a similarly repeated manner. 



Fine Argillaceous Schist, or Clay Slate 



Coarse ditto, or Graywacke 



Chlorite Schist 



Micaceous Schist 



Gneiss 



Limestone 



In another series in Argyllshire, the alternating 

 substances are. 



Hornblende Schist 

 Acti'nolite Schist 

 Quartz Rock 



" 



