110 MINERALOGICAL NOTICES 



Tainuilt.^ — Advancing in the direction of south- 

 west, we find, near the inn of Tainuilt, a coarse 

 compact felspar, approaching to clay-stone, and con- 

 taining small portions of steatite. 



Connal Ferry. — As we approach the Connal 

 Ferry, the rocks assume a different aspect. The 

 felspar becomes more crystalline in its structure, 

 and appears as a subordinate ingredient in quartz 

 rock, of a darkish colour : the claystone or iron- 

 clay, takes a deep violet hue, and is frequently 

 amygdaloidal, containing innumerable specks or 

 portions of steatite and calcspar. It is also found 

 passing into clinkstone and slaty compact felspar. 

 At the Ferry itself, the rock is a hard and dark co- 

 loured slaty compact felspar, which is brittle and 

 easily frangible, when exposed to the action of the 

 air and water. This substance occurs sometimes 

 amygdaloidal. 



Conglomerate. — We come now to the line 

 of coast, where, for many miles from south-west to 

 north-east, the ground rock is clay-slate, with a 

 mass of Conglomerate lying over it ; and exhibiting 

 similar geognostic relations, to those of the same 

 kind of rock on the south-east side of the great 

 Highland range, which have been noticed in some 

 late mineralogical descriptions. It occurs, for ex- 

 ample, at Oban and Beregonium ; and is, probably, 

 the formation to which the substance already de- 

 scribed at the Bridge of Awe may be referred. 

 The base of this conglomerate, is the trap claystone 



