224 ON THE ROCKS pF SANDSIDtl 



In the vicinity of these conglomerated syenites, we 

 observed a fine section of the rocks, displaying a 

 transition from the syenite and granite into conglo- 

 merate, and from this latter rock into sandstone. 



The lowest rock in this section is compact syenite, 

 in some places passing into the conglomerated varie- 

 ty ; and above it, is a mass of pure conglomerated 

 syenite. Over these is a thick bed, the lower part 

 of which is very coarse granular red granite, which 

 gradually passes into a superincumbent conglome- 

 rated granite ; and this graduates into a fine granu- 

 lar sandstone conglomerate, forming the upper part 

 of the bed. The highest rock of the section, is the 

 common sandstone of Caithness, which, in its lower 

 part, has the same characters as the upper part of 

 the subjacent bed. 



The facts just stated shew, that these syenites, gra- 

 nites, conglomerates, sandstones and limestones, pass 

 into each other; and are, therefore, to be considered 

 members of the same formation. 



The syenite is traversed by veins of flesh-red 

 heavy-spar, which contain disseminated leadglance ; 

 and both the syenite and the limestone, contain veins 

 of calcareous spar, in which are brown-coloured 

 rock-crystals, with needles of titanium shooting 

 through them. 



