102 PEOF. T. a. bonnet's petrological notes on the 



hardly be less than 3000 feet in thickness. The rock is snfl&ciently 

 exposed in the cliffs on the right bank of Glen Docherty to enable 

 us to see if they comprise any representative of these strongly marked 

 and peculiar beds. Much there could not be ; for there is not room 

 for any great thickness between the admitted upper and the asserted 

 lower series. Not a trace is visible. Three thousand feet in three 

 miles ! surely this is an unconformity which we could only accept on 

 the clearest and strongest evidence. 



This evidence is, I fear, wanting. Eirst, I cannot admit the ac- 

 curacy of Dr. Hicks's statement about the unaltered condition of the 

 beds of the newer series in Grlen Laggan. I examined them on the 

 ground with great care, and came to the conclusion that though their 

 flaggy character is very marked, they are rightly classed with the 

 metamorphic rocks, consisting, among others, of dark green, rather 

 compact schists, soft dull-coloured mica-schists, and micaceous quart- 

 zites. In the cliff between Glen Docherty and Glen Garrie the 

 " metamorphic " character of the rocks is more conspicuous ; and I 

 cannot conceive it possible to call the beds exposed by the two streams, 

 at the entrance of Kinlochewe hamlet, any thing else than schists ; 

 yet that they are part of the same series it is impossible to doubt. 

 Typical specimens were selected for microscopic examination — two 

 from the face of the cliff in Glen Laggan (a, 6), two from the above- 

 named cliff between Glen Docherty and Glen Garrie (c, d), and one 

 from the left bank of the river, just to the east of Kinlochewe (e). 



Of the Glen-Laggan specimens, (a) was chosen from a compact dark 

 green rock, (b) from a brownish-grey compact quartzose rock, with 

 some minute spangles of silvery mica. Both rocks are very " flaggy," 

 the former, on close inspection, showing a distinct though minute foli- 

 ation parallel to bedding (fig. 5) ; the latter is less distinctly foliated, 



Fig. 5. — Micaceous Schist of the Newer Series, Glen Laggan. 



but obviously altered. The microscope shows them to consist chiefly 

 of quartz and a micaceous mineral, with a fair amount of felspar, 

 some epidote, &c. Minute grains of quartz, as it were agglutinated 



