ON CONGLOMERATED ROCKS. 205 



to Saussure : — an older gneiss which was destroy- 

 ed in the period of the formation of the newer 



2. Comrlomerated Mica- Slate. 



The secondkindof conglomerated primitive rock, 

 is that which occurs in mica-slate. It is composed 

 of variously-shaped portions of quartz and some- 

 times of mica-slate, imbedded in a basis of mica- 

 slate. It occurs in the country between Dunkeld 

 and Mullenasarn in Perthshire ; and many years 

 ago I saw a variety of this rock in Fetlar, one of 

 the 7^etland Islands, as mentioned in the second 

 volume of my '* Mineralogical Travels." 



3. Conglomerated Granite. 



This rock occurs principally in the newer gra- 

 nite formations. It is composed of portions of 

 granite, gneiss, mica-slate, quartz, and felspar, 

 imbedded in a basis of granite. This granite 

 rests upon clay- slate or other older primitive rocks. 

 It occurs in Saxony and other countries on the 

 Continent ; and a conglomerated granite, al- 

 though probably of a different formation from the 

 Saxon, occurs in the Grampians. 



* Von Bucli's " Travels in Norway and Lapland." Black's 

 translation, p. 94. and sr>. 



