270 



THE DOLERITES IN KENTANI 



than the horizontal portions, and this is more pronounced 

 as the inclination increases. There is also much varia- 

 tion in thickness of the dolerite sills in Kentani, the only 

 area which has been mapped in detail along the south- 

 east coast of the Colony. 1 



The Manubi sheet crops out on the right bank of the 



FIG. 22. Map of Kentani showing the distribution of dolerite sheets and 

 "gap" dykes. The area left blank between the Kei and Kogha river is 

 made of sandstones and shales of the Karroo formation. Scale 1 in. to 

 10 - 6 miles. The vertical scale of the section is much exaggerated, in. 

 to 1,000 feet. The name Manubi is written across the Manubi sheet. 

 The trading station of that name is to the east. 



Kogha, where it is 500 feet thick ; it thins out rapidly 

 to the west and is represented by thin outliers north and 

 south of the Kabakazi Valley. North of Gqunqi it is cut 



1 o. C., vi. 



