360 ARGILLACEOUS SCHIST. 



the argillaceous series of the Highland border ; 

 as in Bute and Cowal. 



FOURTH DIVISION. 



Containing fragments of the same, or of other 

 compound rocks : of a conglomerate structure 

 more or less minute. 



A. Fragments of argillaceous schist reunited. 



a. Schistose; slaty. 



b. Imperfectly schistose ; or massive. 



B. Fragments of quartz united by argillaceous 

 schist. 



a. With simple argillaceous schist. 



b. With any of the compound varieties. 



C. Fragments of quartz and of schistose slates 

 united by var. C. div. first massive. 



D. Quartz, felspar, and clay slate in minute frag- 

 ments ; united, with or without an additional argilla- 

 ceous cement. 



E. Fragments of quartz and basalt cemented by 

 a mixture of clay slate and quartz sand. 



F. Fragments of jasper and clay slate, with 

 grains and fragments of felspar and quartz, united by 

 a siliceo-argillaceous base : not fissile, very hard. 



G. Fragments of micaceous schist and quartz, 

 united by a mixture of schistose clay and sand, or of 

 clay, sand and mica. 



H. Fragments of fine or coarse argillaceous schist 

 superadded to the same mixture. 



