Yol. 70.] MIOCENE OF THE VICTORIA NTASTZA, ETC. 137 



considerably : for instance, Beds 30 to 36 are completely absent 

 .and only a trace of the crimson clay of No. 37 is visible at East 

 Kachuku. Moreover, the lower beds of the middle series are 

 already thinner, and the unproductive upper series of grey clays and 

 shales is alone well developed in these two southernmost occurrences. 



The only chance, therefore, of finding further outcrops was to 

 search along the line of strike. After leaving Kikongo, I noted 

 that the basalt no longer rested on the Miocene deposits, but 

 directly upon an ancient and much-altered augite-andesite, which 

 extends over a wide area, now completely deserted and given back 

 to wild animals, owing to sleeping-sickness. Finally, I found 

 what appeared to be an isolated remnant of the upper beds near 

 Minyere on the Kuja River, 15 miles in a straight line from the 

 lake-shore, tilted up at exactly the same inclination : namely, 

 8° north by west, at 3906 feet, very nearly the same altitude as 

 Kachuku (3960 feet). 



Here, in a gap on the wooded banks of the river, where lions and 

 antelopes come down to drink, I found the following downward 

 succession, similar to No. 3 of Nira or No. 4 of Kikongo : — 



Thickness in feet inches. 



(1) Hard brown shale 6 to 9 



(2) Brown clay 1 



(3) Brown shale 6 



(4) Brown clay, becoming sandy in the lower part, 



and overlying the old angite-andesite, which 

 extends in rocky masses of angular boulders 

 more than halfway across the river 8 



In another exposure, 100 yards farther down the river, grey 

 clays were visible, forming a low cliff in a broad tributary valley, 

 about 50 yards away from the Ogo Ford of the Kuja ; they pro- 

 bably belong to a lower horizon, and are similar to No. 9 of Nira 

 and Kachuku : — 



Thickness in inches. 



(1) Hard grey clay, shaly in the lower 3 inches 9 



(2) Grey shale 3 



(3) Grey clay 3 



(4) Limonitic clay 9 



(5) Grey clay, base not seen 12 



The broad valleys in this region, tributary to the Kuja, all show 

 a grey clayey soil, perhaps due to washed-out remnants of these 

 deposits. 



Although not a trace of fossils was visible, it was clear that the 

 character of these beds is altogether different from the homo- 

 geneous river-alluvium of the opposite bank. They are precisely 

 similar to the upper beds of the Miocene Series as seen at Nira, 

 East Kachuku, and Kikongo ; they occur on the same line of 

 strike and at the same altitude, and show the same dip. Hence, it 

 seems only reasonable to consider that this occurrence represents 

 the easternmost remnant of the beds, and that they have been 

 completely denuded away from any part of the intervening andesitic 



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