Appendix C 



the luouutjiin is essentially constituted of gneiss, the iiiotite variety and microdine 

 being common on the lower pai'ts of the mountain. This gneiss, associated 

 with 7nica-schis:fs, may be traced from Ibanda by the Mahoma Valley, not only 

 up to the crests of the mountain, ])ut probably also extends to the south and 

 west of the range. 



It should be mentioned that in Mt. Luigi di Savoia there are large dikes of 



macroscopic pt'(/mafi/e rich in yanict and tounnaline, haplite and micro-granite in 



the neighbourhood of Stairs Peak ; diabase, which crops out at Sella Peak, whei'e 



»it abounds in fulgurites ; diorite, epidosyie and crystalline chalk, which seems to 



point at contact between the gneisses and the amphibolic schists. 



Mt. Spekp:. — The prevailing rock appears to be a granitoid gneiss with 

 biotite and almndant ('iiidole .• with the gneiss would appear to be associated 

 diorite, aìiipliibolitc and micro-granite. 



Mt. IImin. — Yields ([unrtzite and a diorite analogous to that of Mt. Stanley. 



^1t. Gessi. — The dominant rock again appears to be ainphibolic schist in 

 association with quarfzite and epidosi/te. 



In the Bujuku Valley the prevalent form appears to be of a type analogous 

 to that occurring on Mt. Speke. This valley, as well as that of the Mubuku, 

 would seem in its upper reaches to open out in contact with gneiss and 

 amphibolic rocks. 



Teetonic Structure. — The tectonic feature by which the Kuwenzori ÌNIassif is 

 outlined and clearly characterized is represented by two great zones of fracture. 

 One lying to the west is of vast size, having given rise to the Semliki Valley, 

 and in this direction completely isolated the enormous mass of the Kuwenzori 

 Kange. The other (eastern) zone of fracture is less marked, but well outlined 

 by the volcanic formations, in which are included those of Fort Portal. 



In relation with the two main zones of fracture, others occur in the interior 

 of the range, and these arc disposed in two different directions, one west and 

 east — that is to say, normal to the chief trends — the other, on the contraiy, 

 running in ])arallel lines from south to north. To these lines of irnier fracture 

 are due several valleys and many of the secondary glens, which tend to give 

 their characteristic isolation to all the ])riiiri[ial heights. 



The stratigraphic disposition is I'cgular. As we ascend the Mobuku 

 Valley, we everywhere notice in the gneiss and mica-schist beds an incline fi'om 

 east to south-east. This incline is, on the whole, maintained in Mt. IJaker, 

 and is clearly seen, for instance, in Cagni Peak. In Mt. Luigi di Savoia the 

 cast-south-east slope lecurs, witii a tendency to the south which farther on 

 becomes due south. In Mt. Staidey the south-east tends to change to west 

 or north-west, although the south-east to east incline I'eapiieais in the IJujuku 



