CHAEACTEES OE A SEEIES 0E SCOTCH EOCKS. 163 



with a little chlorite in parts of the slide, a fair amount of epidote, 

 and probably a littie cyanite. Probably II. ; but I think there has 

 been some crushing which has given rise to difficulties. 



7 (on side of hill, north of Achnashellach). A rather compressed 

 micaceous schist, difficult to classify macroscopically. Microscopi- 

 cally it consists mainly of quartz granules and flakes of pale green 

 mica like that often described, with epidote, a little felspar, iron- 

 oxide, &c. There are certainly indications of an original frag- 

 mental structure, and the rock generally resembles No. I. series; 

 but there has been a good deal of metamorphism. 



8 (the same locality). The microscopic differences from the last 

 one are only varietal. 



9 (towards base of hill north of Achnashellach). A compact 

 reddish and dull greenish gneissic rock, seemingly highly altered 

 and even microporphyritic ; but seen under the microscope a f rag- 

 mental structure is at the first glance as conspicuous as in any of 

 the No. I. series. At the same time, a more careful study gives 

 rise to doubts as to whether this resemblance may not be illusorj- 

 as regards its origin, and whether we have not here an instance of 

 one of the older series locally crushed. At first I inclined to regard 

 it as a member of the newer series ; but repeated examination has 

 produced considerable doubt on this point. Probably the question 

 could be settled by cutting a series of slices from different parts of 

 the block ; but as I learn this is not a matter of great importance, 

 I have thought the expense needless, and must leave the matter 

 in uncertainty. 



10 (shore of Loch Carron, north of Jean town). A dark, rather 

 heavy, moderately fissile mica-schist. Microscopically it exhibits 

 brown mica in addition to that described above, contains little fel- 

 spar, but some garnets, and appears to have undergone considerable 

 compression at right angles to the planes of foliation. It has a 

 good deal in common with the last three, but seems yet more 

 highly altered. It reminds me much of a mica-schist which I have 

 described and figured from the head of Glen Docherty. 



11 (Glas Bheinn). This consists of a dull green hornblendic or chlo- 

 ritic mineral, parted by irregular cherty layers of variable thickness. 

 The green mineral proves to be a well-crystallized hornblende, with 

 characteristic cleavage. The cherty layers consist of grains of 

 decomposed felspar crowded with micaceous films and granules of 

 andalusite (?) and of quartz. The rock is much metamorphosed ; 

 but there has evidently been local crushing, infiltration, and secon- 

 dary change to such an extent that it is difficult to say whether it 

 is more typical of II. or III. 



12 (valley between Jeantown and Kishorn, near Bridge). A 

 handsome pale reddish augen-gneiss, the " eyes " being of felspar, and 

 the ground-mass rather compact-looking. Macroscepically one would 

 not hesitate to refer it to series II. ; but microscopically the struc- 

 ture differs from what one expects : in a ground-mass of quartz and 

 a very pale brown mica, together with a few felspar granules, occur 

 irregular grains of felspar; the edges of these are, indeed, as it 



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