210 Oeologtcal Sociefy. 



With this Atlas before lis wc are more thau ever sure, as wo 

 eaid, that the work will be of immense value, not onlj- to students 

 of the Xew Zealand MoUusea, but to all raalacologists. Would that 

 other governing bodies, including some not far removed from home, 

 could be induced to undertake similar works of scientitic utility ! 



niOCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



November 17th, 1915.— Dr. A. Smith Woodward, F.R.S., President, 

 in the Chair. 



Mr. Jony Paekinson gave an account (illustrated by specimens 

 and lantern-slides) of some observations on the Structure of 

 the Northern Frontier District and Jubaland Provinces 

 of the East Africa Protectorate, made by liim while 

 conducting a water-supply survey for the Government of the 

 Protectorate. A floor of gneisses and schists, among which the 

 Turoka Series of metamorphosed sediments was found at several 

 places, is overlain on the western side by lavas, including those 

 aiising from the volcanoes Kulal, Assi (' Esie ' of the maps), Hurri, 

 Marsabit, etc., and by probably older lava-fields which together 

 extend as far as long. 39^ E. On the south, it was found that 

 the lavas north of Kenya reached the Guaso N}di-o, leaving 

 ' inselberge ' of the crystalline rocks in their midst, but that a 

 high gneiss country extended north-westwards from lat. 1° N. 

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

 Eastwards the Coastal Belt of sediments jn-oved to be of L^pper 

 Oxfordian age and to extend to long. 40|° E. (west of Eil Wak), 

 and these were lost southwards under the great alluvial plain of 

 Jubaland. 



At inten-als throughout the alluvial plain and lying in hollows 

 in the Jm-assic rocks, disconnected exposures were found of soft 

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

 which cannot now be definitely fixed. 



Evidences of the desiccation of the country were, it was thought, 

 shown (1) by the Laks or water-channels chai-acteristic of Juba- 

 land, which contained surface-water only during the rainy season 

 and then extremely rarely, if ever, tliroughout their length ; 

 (2) by the presence of freshwater molluscs in the scarcely con- 

 solidated beds of such Laks and at other places where now no 

 surface-water is present (Buna and near the Abyssinian frontier) ; 

 and (3) by 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 



