92 



These are among the most simple successions 

 which it appears necessary to point out. 



In the following examples the different rocks 

 in each group occur in every possible mode of 

 relation and succession, and in repeated alterna- 

 tions. 



Micaceous schist. 



Fine argillaceous schist: (clay slate). 

 Micaceo-arg'illaceous schist : (gray wacke). 

 Arenaceo-argillaceous schist : (graywacke). 

 Fine conglomerate schist : (graywacke). 

 Quartz rock. 

 In Jura and Scarba. 



Fine argillaceous schist: (clay slate). 

 Coarse, of various characters : (gray waekes). 

 Chlorite schist. 

 Micaceous schist. 

 Gneiss. 



To which is sometimes superadded 



Limestone. 

 In the southern Highland border, and in Bute. 



Hornblende schist. 

 Actinolite schist. 

 Quartz rock. 

 Micaceous schist. 

 Chlorite schist. 



