Vol. 6 3 .-] 



THE GEOLOGY OF THE ZAMBEZI BASIN". 



213 



Appendix III. 



Notes on the Supebeictal Deposits along the Routes 

 masked on the map (pi. xvii). 



Locality. 



Charade)- of the Surface traversed. 

 Northern Side of the Zambezi. 



Victoria Falls to the Songwij 

 River. 



Songwi River to Mavangu 

 Mavangu toTshimamba ... 



Tshimamba to Kalonga's Cleft. ; 

 Kalonga's to the Kalomo River. 



Kalomo River to the Gwemanzi 

 River. 



Gwemanzi to 'Ntoro 



'Ntoro to Makwa 



Stony flat, a former bed of the Zambezi, cut by- 

 gullies ; "with spriukling of gravelly chalcedonic 

 detritus. 



First, alternations of stony lateritic ground with 

 grassy flats of thiu loam : then, a sand-bult at the 

 head of small streams draining to the Zambezi. 



Continuation of the sand-bult, with loose blocks of 

 'silcrete' (surface-quartzite) in patches along the 

 edge ; then broken basaltic country, with lateritic 

 soil. 



Rugged dissected basalt-country, with some heavily 

 grassed stretches of loam along diy stream-beds 

 on the plateau. 



Very rugged basalt-country : huge bars, up to 12 

 feet high, of basalt-boulders, in the bed of the 

 Kalomo, with a sprinkling of pebbles and mica- 

 flakes from the Fundamental Complex. 



Smoother and less broken plateau beyond the 

 Kalomo basin, with shallow valleys containing 

 much detritus of the ancient rocks, etc. (see 

 p. 172). A patch of ' silcrete ' on the flat east of 

 the Namaruba River, and traces of high-level 

 gravel. 



Slightly -broken basalt-plateau, "with scattered blocks 

 of ' silcrete ' and some pinkish quartz-pebbles, but 

 little or no detritus of ancient rocks in the 

 streams. 



Descent from the plateau over basalt, with sprink- 

 ling of granitic, etc. gravel in places, and patches 

 of ' calcrete ' on the lower ground : tract of red 

 sand on the slope leading to the Zambezi. 



Southern Side of the Zambezi. 



Makwa to the Matetsi River ...] 



Matetsi valley, from Tsheza's 

 to the confluence with the, 

 Zambezi. 



Matetsi River (Tsheza's) to the; 

 Lukunguli River (Sianteti's) 



Sianteti's to the Batoka Gorge 



Sianteti's to Dambi's (Lukun- 

 guli valley). 



Dambi's, to the head of the Lu- 

 kunguli valley, and across the 

 water - parting to Matetsi 

 Station. 



Sloping bult of red sand, covering a ridge, with 

 'silcrete,' ' calcrete,' etc. at the edge (see p. 199). 



Broad valley with steep sides; several terraces of 

 dark alluvial loam in the bottom, the lowest con- 

 taining manj r freshwater shells 1 ; broad delta of 

 basalt-boulders at the confluence. 



Blocks of ' silici-calcrete ' abundant on the basalt- 

 spurs of the Matetsi valley, and a patch about 

 15 feet thick on the crest, at the margin of the 

 plateau. Upland flats of thin loam thickly 

 grassed, breaking away into stony basaltic valleys. 

 Some mottled red sandstone and ' silcrete ' at the 

 margin of a thinly sand-covered tract. 



Basaltic upland, with lateritic soil and gravelly 

 ' ferricrete,' 'silcrete,' and loam in places, be- 

 coming very rugged towards the Batoka Gorge. 



Ferruginous and chalcedonic gravel on a high terrace 

 in the valley : stony slopes on the south, leading 

 to a plateau of the usual type — alternately stonj r 

 and loamy — ; but westward, grassy loam-flats 

 expand into a wide basin, edged on the north and 

 south by sand-bults. 



Loamy flats, edged by rocky ground and partly 

 surrounded by sand-bults ; some ' ferricrete ' and 

 ' silcrete ' along the edge of the sands : also cakes 

 and veins of iron-ore at the top of the basalt in 

 places. 



See list in Rep. Brit, Assoc. 1905 (South Africa) p. 301. 



