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where it abuts on the Kle- 

 dang granite. Schists occur 

 on the east side of the valley 

 at Gopeng, but none of the 

 tourmaline-corundum rocks 

 have been found on that 

 side ; and it is obvious, from 

 the height of the limestone 

 hills on the east (they reach 

 2000 feet) and the presence 

 of the cap of schists on the 

 west, that the general dip 

 of the limestone, as a 

 whole, is gentle and to the 

 westward. 



The limestone is, as M. 

 Collet says, probably Car- 

 boniferous, and is almost 

 entirely crystalline. It is 

 sometimes pure white, 

 sometimes grey, sometimes 

 streaked with black and 

 white bands, the black 

 variety being carbonaceous. 

 It is occasionally traversed 

 by pipes and veins con- 

 taining tin ore, and its 

 rough pinnacled surface has 

 caused in a large measure 

 the concentration of the 

 enormous wealth of tin 

 dioxide which has made 

 Kinta so famous. In the 

 north of Kinta I have seen 

 argillaceous partings be- 

 tween thin beds of grey 

 limestone, but nowhere have 

 I seen any schists, or indeed 

 any rock, distinctly below 

 and older than the lime- 

 stone. 



The thickness of the lime- 

 stone, then, is unknown. 

 A drill was put down at 

 Lahat for 600 feet, but was 

 still in limestone when the 

 work ceased, although it 

 might be reasonably ex- 

 pected that granite would 

 have been encountered at 

 a greater depth, since the 

 drill was running parallel 

 to a stanniferous deposit. 



