214 ME. G. W. LAMPLUGH ON THE [May 1907, 



Locality. Character of the Surface traversed. 



Matetsi Station to Lukubiro's 

 (Matetsi and Tshitshigumba 

 valleys). 



Lukubiro's to Matbeison's 

 (head of the Matetsi basin). 



Matheison's to Deka (head o£ 

 the Deka basin) 



Deka to 'Ngoni's (southern edge 

 of the Deka valley). 



Narrow sand-bult in the angle between the rivers, 

 indurated to a soft red rock at the base; but 

 chiefly loam-flats, with stony lateritic tracts in 

 the valleys. 



Succession of broad grassy flats of black loam, up to 

 9 feet deep, interspersed with low rises of basalt 

 with thin lateritic soil : a thin patch of 'calcrete' 

 on the north side of the Matetsi River where 

 crossed. 



Broad sand-bult, rising 200 to 300 feet (Boomka 

 of Chapman), between the basins of the Matetsi 

 and Deka, with some patches of flaggy sandstone 

 at the edge (see p. 196) ; but country otherwise as 

 last. 



Grassy loam-flats and stony basalt-country inter- 

 spersed, the latter thickly sprinkled in places with 

 small pebbles and rough lumps of quartz, quartzite, 

 chalcedonjr, and sandstone : also some sand-veld 

 in approaching 'Mtoro's. 



EXPLANATION OF PLATES X-XVII. 

 Plate X. 



Rift, about 80 feet deep, in Cataract Island, Victoria Falls, excavated along 

 a vertical joint or small fault in the Batoka Basalts by an overflow streamlet. 

 The ' Leaping Water ' is seen in the distance. 



Plate XL 



The Batoka Gorge, looking up from the confluence of the Songwi Eiver, 

 about 6 miles below the Victoria Falls. A sand-bult forms the sky-line on 

 the left. 



Plate XII. 



The Batoka Gorge at Syakowi, near the confluence of the Mavangu stream, 

 looking down, about 17 miles E.S.E. of the Victoria Falls. 



Plate XIII. 



The Batoka Gorge, about 25 miles E.S.E. of the Victoria Falls, immediately 

 below the Tshimamba Cataracts looking N.E., down stream (see plan, fig. 5, 

 p. 189) ; showing the flood-platform with islands, and the development of zigzags 

 along joints in the low-water channel. 



Plate XIV. 



The Batoka Gorge at the confluence of the Karamba River (see fig 6, p. 190) 

 about 35 miles east of the Victoria Falls, looking west, up-stream ; depth of 

 gorge = about 750 feet. 



Plate XV. 



Kalonga's Cleft, nearly 300 feet deep, at, the head of the gorge of the 

 Karamba River, a tributary of the Zambezi (see figs. 6, 7, & 8, pp. 190-191). 



Plate XVI. 



The Batoka Gorge at the sharp bends just below the confluence of the 

 Songwi River ; showing promontories (' knife-edges ') partly destroyed by 

 Aveatbering, and a lower pinnacle (in the middle of the picture) cut off by an 

 ancient channel of the river. 



Plate XVII. 



Geological sketch-map of the country around the Batoka Gorge of the 

 Zambezi, on the scale of 10 miles to the inch ; and three diagrammatic sections : 

 (1) across the Zambezi basin ; (2) across the lower portion of theWankie Series 

 at Wankie; and (3) in theWankie Series adjacent to the Deka Fault. 



