Reports & Proceedings — Geological Society of London. 429 



3. Beds 26-37. A lower group, about 35 feet thick, of current- 

 bedded sandstones and gravels passing down into clays and marl- 

 stones. A conglomerate of calcareous nodules overlies gravelly 

 sandstones (No. 31) containing isolated bones of Dinotherium, 

 Antbracotheroids, rhinoceros, giant tortoises, etc., indicating a Lower 

 Miocene (Burdigalian) age, with Ampullart'a, Cleopatra, and 

 terrestrial shells ( Cerastus). 



These fluviatile sediments were deposited in a lagoon, and were 

 derived from gneisses, andesites, and quartzites that still occur in situ 

 to the eastward. Calcareous springs acted intermittently, and the 

 sediments became finer and less fossiliferous as the river-system 

 reached its base-level. 



The series overlies gneisses and amphibolites, with a north-north- 

 westerly and south-south-easterly strike. In searching for the 

 extension of these beds the author found them to be completely 

 denuded on the south, while on the nortb they disappear beneath the 

 basalt-plateau. Marching up the Kuja Valley, he found the upper 

 beds lying on old andesite 15 miles inland, on the line of strike. 

 Evidence is adduced of the lake having stood about 330 feet above 

 its present level, and of a rejuvenation of the rivers since the 

 formation of a gneissic peneplain, above which the Kisii Highlands 

 rise in steep escarpments of ripple-marked, unfossiliferous, quartzitic 

 sandstones, probably Devonian, separated from the underlying 

 gneisses and schists by an extensive dolerite-sill. From Kisii the 

 peneplain was traversed to the region of nepheline lavas near Homa 

 Bay. Lake Simbi, an explosion-crater, was investigated ; and 

 a Pliocene series was found north of Homa Mountain. 



The vertebrate remains described by Dr. C. W. Andrews include 

 Proboscidea, Hyracoidea, Artiodactyla, Podentia, and Peptilia, and 

 fully support the suggested occurrence of Lower Miocene deposits on 

 the shores of the Yictoria Nyanza. A deposit of probably Pliocene age 

 yielded a new (?) species of Elephas, also bones of antelopes and baboons. 



The non-marine MoUusca associated with the Miocene vertebrates 

 are freshwater and terrestrial shells which all belong to existing 

 species. Only AmpuUaria, however, still occurs in the Victoria 

 Nyanza, while Lanistes carmatus is not found nearer than the Tana 

 River, and the nearest recorded locality for Cleopatra hulimoides is in 

 the Lake Pudolf region and Mombasa. Among the terrestrial shells, 

 Burtoa is the sole genus occurring near the Victoria Nyanza ; the other 

 forms ( Cerastus, Iropidophora, Achatitia) are found at considerable 

 distances tjierefrom. The total absence of Pelecypoda is also interesting. 



On Wednesday, June 18, 1913, a Conversazione, at which about 

 three hundred ladies and gentlemen were present, was held in the 

 Society's apartments, from 9 to 11.30 p.m. In the course of the 

 evening, lectures, illustrated by lantern-slides, were delivered by 

 Professor W. W. Watts, P.R.S., on "The Buried Landscape of 

 Charnwood Forest", and by Captain H. G. Lyons, F.P.S., on "The 

 Marshes of the Upper Nile", and many interesting exhibits were shown. 



The next meeting of the Society will be held on Wednesday, 

 November 5, 1913. 



