﻿Vol. 66.~] TOURMALINE-CORUNDUM ROCKS OF KINTA. 449 



Plate XXXI. 



Fig. 1. A large pear-shaped body, composed of tourmaline, white mica, and 

 granules that may be corundum. 



2. Tourmaline-corundum rock showing no definite structure. 



3. The Eedhills type-rock. The microphotograph shows a body consisting 



of a shell of granular corundum and a nucleus of brown tourmaline 

 grains. 



4. Showing the structure of a large cavity in the Eedhills type-rock. 



There is a double lining of corundum grains, and tourmaline and 

 corundum grains between the two, and tourmaline again on the in- 

 side of the inner lining. 



5. Black carbonaceous and siliceous rock, showing a trace of radiolarian 



structure, from the open cut behind Redhills. Below the centre of the 

 photograph a fine reticulated structure can just be seen. In the same 

 slide clear circular spaces are numerous, as in the radiolarian cherts 

 of Pahang. 



6. Structures in a dark carbonaceous chert from the Pahang Chert Series 



(Bentong Reservoir), resembling the smaller bodies in some of the 

 tourmaline-corundum rocks. 



[The Author is greatly indebted to Mr. H. H. Thomas, M.A., F.G.S., for 

 assistance in preparing these plates.] 



