338 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Maj 21, 



mountains, viz. Smechian, the Maiden Pap, Morven, and Little 

 Morven, which generally lie to the north of the Scarabins, are made 

 up of fragments of these quartz -rocks in the lower portion of their 

 series. 



Small Mount, one of the Scarabins, which is to the west of 

 Morven, is made up of white quartz-rocks dipping towards the 

 south. From Small Mount, a ridge of rocks of the same nature runs 

 N.E. to Cnoc-na-neranach, also consisting of quartz-rocks, some 

 of which are micaceous ; and these also have a south dip. To the 

 south of Cnoc-na-neranach lies Sudhe-voir-veig (Child^s Chaiy-), a 

 very picturesque hill, differing in its outline from the Scarabins, 

 and nearly allied in form to the isolated Old Red mountains to the 

 north ; and this, I learn from Donald, is composed of rocks similar 

 to those of Morven, and is another isolated mass of Old E-ed among 

 the metamorphic rocks of this region. South from Cnoc-na- 

 neranach the country is covered by peat, and even in the courses of 

 the high streams which flow into the Suisgill Burn no traces of 

 rock can be seen in situ. 



The head also of the Berridale "Water, as regards exposures of rock, 

 is in the same condition, as well as the tributaries to the Kinbrae 

 Burn ; but the lower part of this burn traverses granite, and no 

 further traces of quartz-rocks can be seen to the westwards. 



In the district which lies south of the Scarabins, and which is 

 drained by streams which flow into the River Ullic, or Helmsdale, 

 we have exposures of rocks as follows : — In the road along Strath 

 UUic, from Helmsdale, granite is prevalent to Kilphedric, where a 

 quartzose gneiss appears. In the Torshish Burn this is seen dipping 

 N.W. at 75°. Less than a mile west of this stream Alt Brackie 

 occurs, in which grey quartz-rocks are seen inclining S.E. at 75°. 

 Two miles further to the west we have Alt Duible, a small stream 

 which flows over contorted grey quartz-rocks, with prevailing S.E. 

 dips. A short distance westward from this is another smaU stream, 

 not named on the map ; and in this the grey quartz -rocks are seen 

 almost horizontal. 



About half a mile to the west is Kildonnan, in the stream of which 

 the rocks are well displayed. At the bridge they consist of thin- 

 bedded gneiss, with granite ; and here the dip is E. at 45°. Up 

 the stream, above the bridge, the thin-bedded gneiss passes into grey 

 quartz-rocks, varying in the angle of the inclination ; and these 

 rocks, in their strike, seem to pass to the west of Cnoc-na-neranach. 



Higher up Kildonnan Burn the dips have a disposition to become 

 ]Sr.E. ; and, where the Alt-na-nuan from the east joins the Kildon- 

 nan Burn, this direction obtains in gneiss which is very rotten, and 

 which is associated with grey quartz-rocks. Polio wing Alt-na- 

 nuan eastwards, quartz-rocks, grey in colour and with east dips, are 

 seen; but the higher portion of this stream is through peat — a 

 circumstance which is common to most of the upper parts of the 

 streams in this portion of Sutherland. Upwards, the course of Alt- 

 na-nuan leads into the head of Alt-Brackie, the lower portion of 

 which has been already alluded to. This stream, where rocks are 



