﻿part 1] 



PROCEEDINGS OF THE GEOLOGICAL SOCIETT. 



Ill 



and longitude 38° E. to within a short distance of Lake Rudolf. 

 Eastwards the coastal belt of sediments proved to be of Upper 

 Oxfordian age and to extend to longitude 40| D E. (west of Eil 

 Wak) ; these were lost southwards under the great alluvial plain 

 of Jubaland. 



At intervals throughout the alluvial plain and lying in hollows 

 in the Jurassic rocks, disconnected exposures were found of soft 

 calcareous sandstones or limestones (Wajhir, Eil Wak), the age of 

 which cannot now be definitely fixed. 



Evidence of the desiccation of the country was adduced from 

 (1) the Laks or water-channels characteristic of Jubaland, 

 which contained surface-water only during the rainy season and 

 then very rarely, if ever, throughout their length ; (2) the presence 

 of freshwater molluscs in the scarcely-consolidated beds of such 

 Laks, and at other places where now no surface-water is present 

 (Buna and near the Abyssinian frontier) ; and (3) the presence 

 of wells along fault-lines and in other places where, but for the 

 previous presence of springs, it appears improbable that the natives 

 would have begun sinking. 



The region between Lake Rudolf and Marsabit was pointed out 

 as one of exceptional interest, which the lecturer had so far not 

 been able to investigate. 



The depression between the Mathews and associated ranges and 

 the Abyssinian frontier on which the Marsabit and Hurri volcanoes 

 were situated, and the origin of the Kuroli Desert (Elgess), were 

 the outstanding features of the district that required further 

 elucidation. 



Mr. G. C. Crick stated that the cephalopoda submitted to him 

 by Mr. Parkinson consisted chiefly of crushed ammonites from 

 dark-grey shales at Kukatta on the Juba (latitude 2° 8' ~N.), there 

 being also a belemnite preserved in a yellowish-brown rock-fragment 

 from Serenli on the same river and somewhat north of Kukatta. 

 He regarded all the ammonites as referable to Perisphinctes and 

 its section Virgatosphinctes, and to species which had previously 

 been described from the neighbourhood of Mombasa. From this 

 assemblage of forms he concluded that the shales at Kukatta were 

 of Upper Oxfordian (Sequanian) age. He stated that the belemnite 

 from Serenli indicated the presence there of a slender sulcate form, 

 similar to those previously recorded from British Somaliland on the 

 north and from the neighbourhood of Mombasa on the south ; but, 

 although of Jurassic age, it was too imperfectly shown in the 

 rock-fragment for accurate determination. 



Mr. 11. Bullen Newton said that he had examined a small 

 series of non-marine Kainozoic molluscan remains belonging to 

 recent species, and associated with hard and soft limestones, 

 calcareous sandstones, and conglomerates, which had been collected 

 by Mr. Parkinson, and had determined them as follows : — 



a 2 



