386 



Professor A. C. Seward- 



— Scale. 



,^!!1!1, Crystalline 

 ^^J Series. 



Marble 



Tanga Beds. 



Marine Jurassic, 



o Tosail PUnf"*- 



Surface AMD 

 Coastal Deposits. 



Sands , Sflndj da\/s, Coral mltu 



Late TertiaRYt.Recemt 



Fig. 1. — Geological Sketch-map of Tanga District, Tanganyika Territory. 



the later marine Jurassic beds and young superficial sands and sandy 

 clays mask the older sediments. In the north the beds pass into 

 Kenya Colony, largely covered with a capping of sands. 



" Good sections of the rocks are to be seen along the relatively deeply 

 cut valleys of the Kombe, the Msimbazi and the Sigi. Much of tb e 

 intervening country is covered with a thin capping of sands and 



