512 PROFESSOR J. W. GREGORY. 



country and not, as I had expected, across it. So at Huambo Crossing we left 

 the route of the railway, which was there still under construction, hoping by a 

 traverse northward to reach a more varied series of rocks and better soils. The 

 Commander of the Huambo Fort kindly engaged for us extra porters in order to 

 visit Bailundo and the head streams of the Cutato River, a tributary of the Cuanza. # 

 A mile and a half 18° east of north from Huambo Crossing is an exposure of a 

 coarse-grained white quartzite, and beside it lay fragments of decomposed slate and 

 quartzite'. A little over a mile further a stream gully exposes a coarse white granite 

 especially rich in quartz. Thence to Huambo Fort the plateau is littered with 

 fragments of sandstone, while the gullies reach quartzose granite. Near the fort 

 the granite is exposed on the surface of the plateau. The fort stands on a rise of 

 porphyritic granite, which forms part of the watershed between the rivers discharg- 

 ing south-westward through the Cunene and Mossamedes, and those which go north- 



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north-westward through the Queve and Culele to the Cuivo and thus reach the 

 Atlantic north of Novo Redondo. 



The track to Bailundo starts from Huambo on an approximately north-north- 

 easterly course, across the head streams of the Queve and Culele. The country 

 consists of granite for the first 8 miles north of the fort. The granite rises in 

 tors and monoliths, one of which is known as Cleopatra's Needle. The granite is 

 generally biotitic, and sometimes porphyritic, with large blebs of biotite, and on the 

 margins of some of the granite bosses are bands of a tough granite porphyry. At 

 the Landula t River this last rock occurs in veins in the normal granite. This river 

 exposes a green, massive quartzite, which is so compact that the grains are barely 

 recognisable except on weathered surfaces. It belongs to the group referred to as 

 the Huambo Quartzites. Approaching the Queve River, the granite is succeeded by 

 decomposed quartzite, and at that river are exposures of a quartz-schist with large 

 clastic grains. The rock is noncrystalline, and the original cement has recrystal- 

 lised in lines of fine-grained quartz-mosaic. They represent a fine-grained, purely 

 siliceous variety of the Bailundo Schistose Quartzites. They differ from the Huambo 

 Quartzites by their well-developed foliation. 



* There is another Cutato in the district, which is a tributary to the Zambesi. 



t Thus spelt by A. DE Andrade ; spelt Lamlulo by Varian, and also as Londulo. 



