436 MR. G. BARROW ON THE MOINE GNEISSES [Nov. I904, 



alternations of yellow or grey quartzose laminae and films of dark 

 material, the whole bearing an unusual resemblance to unaltered 

 sediments (8522, 8523, & 8524). The grey siliceous laminae closely 

 resemble the typical Honestones from Glen Mohr, but as a whole they 

 are intermediate in composition between these and the parallel- 

 banded rocks at Glen Callater ; indeed, 8524 can be exactly matched 

 at Glen Callater. Similar material occurs in several instances in 

 this neighbourhood next the Quartzite, aud at the head of Glen 

 Chonnie it is succeeded by the Little Limestone (8549). The latter 

 shows well the change that takes place as the Parallel-Banded 

 Ilocks become more siliceous or the dark partings become thinner. 

 In place of being built up mainly of white hornblende, the 

 Limestone is now composed of aggregated patches or crystals of 

 this mineral set in a matrix of calcite, biotite, quartz, and iron-ores. 

 The fine dark dust is present in smaller quantity. In this part 

 of the district the Limestone always loses its typical aspect as 

 the border of the Moine Gneisses is approached, and in one case 

 resembles a film rich in epidote noted in the Banvie Burn (8551, 

 8552). 



The Parailel-Banded material just described is obviously the 

 equivalent of the more micaceous portion of the Honestones. In the 

 next burn to the north (Allt Unich), the more siliceous pink-and- 

 grey material next the Quartzite is more persistently exposed. 

 Starting where the two branches of the burn join, the Quartzite aud 

 the marginal rocks (Honestones) are well shown, the. latter being 

 clearly the same as No. 9406 from the foot of Glen Mohr. These 

 rocks were obviously part of one bed of sandstone originally, and 

 they now fold together as one rock, and are quite inseparable. 

 Farther down the stream they not only become more crystalline, 

 but the pink-and-grey portion rapidly thickens. The burn is 

 ■obscured by Drift for a short distance, but fortunately the rocks can 

 be followed in the bank to the south-west ; and, returning to the 

 burn once more, just before the fault is reached we find the coloured 

 bands now so highly crystalline that a specimen (8518) taken from 

 a little scar at the burn-side is a typical pink-edged epidotic gneiss, 

 practically identical with No. 8519 taken 7 miles away from the 

 heart of the Moine-Gneiss area, and close to the margin of the 

 Cairngorm Granite. It will be noted that, in this little scar, the 

 low dip of the Moine Gneiss and its accompanying structures are 

 met with. To the north-east of this point, towards Braemar and 

 well up the hill-side, it is evident that the Quartzite is also involved 

 in the movements that produced the Moine-Gneiss structure ; and 

 this is placed beyond dispute by the distinctive pink-and-grey colour 

 of the marginal rock. From this burn, then, almost to Braemar, a 

 large portion of the Moine G neisses are really the Quartzite, in what 

 may be conveniently called a ' Moine-phase.' 



At the northern foot of Morone, rather more than 2 miles south- 

 west of Braemar, the Limestone and Parallel-Banded Bocks are 

 ■exposed in the face of a small scar. In this, the margin of the 

 Limestone is repeatedly folded on itself, and has almost the typical 



