350 ME; J. B. SCKIVENOR ON THE [June I913, 



Tembeling Series. They consist of conglomerate, quartzite, 

 grit, shale, and clay-slate. The two first-named rocks contain 

 pebbles of radiolarian chert. The quartzite is very largely 

 weathered back to sandstone, and the ' Myophorian Sandstone' 

 described by Mr. R. B. Newton belongs to this group. 1 



There is not much to add here to the description of the Malayan 

 glacial deposits given in my paper on the Gopeng Beds. They have 

 been traced northwards and southwards outside the Kinta District, 

 and are now known to cover' a large area., There is one important 

 addition to be made, however, and that is a continuation of my 

 remarks (on pp. 157-58 of the paper just mentioned) regarding the 

 relations of the corundum-boulders in the glacial clays on the east 

 side of the Kinta Valley to the tourmaline-corundum rocks found 

 on the west side. Evidence has now been collected, showing that 

 the similarity noted by Mr. W. M. Currie, of the clays containing 

 the tourmaline-corundum rocks with glacial clays, is supported by 

 facts ; while my first notion, of the tourmaline-corundum rocks and 

 the containing clay being the remains of much-weathered schists, 2 

 can no longer be maintained. Now that the survey of Kinta has 

 been completed, it is found that this earlier view involves hopeless 

 difficulties. For instance : if bedding in the clays' over the limestone 

 on the east is preserved, why is it not preserved in the clays over 

 the limestone on the west ? The limestone is similarly affected by 

 ground-water in both areas, and there is no' evidence to show that 

 there has been a greater sinking movement of clays over it in one 

 area than in the other. The inevitable conclusion is that bedding 

 never existed in the western clays, and that they really are, what 

 they seem to be, glacial boulder-clays. This question of the relation 

 of the eastern and western clays is discussed fully in the memoir 

 on the Kinta Valley now in the press. 



VII. The Pahang Volcanic Series. 



This series of volcanic rocks is widespread in the interior of 

 Pahang, west of the Main Gondwana Outcrop. Only a few 

 occurrences are recorded outside Pahang. It has not been studied 

 very minutely as yet, but enough is known to say that it is composed 

 of lavas and ashes and perhaps of hypabyssal masses. The rocks 

 comprised in the series are quartz-porphyry, porphyry, granophyre, 

 dacite, andesite, augite-andesite, and dolerite. They are frequently 

 sheared and metamorphosed near the granite-junctions. I have 

 already described the alteration of the clacites and dacite-tuffs of 

 Pulau Nanas, near Singapore, by the Mesozoic Granite. 3 The greater 

 part of the eruptions that produced these rocks were submarine. 



1 ' On Marine Triassic Lamellibranchs discovered in the Malay Peninsula ' 

 Proc. Make. Soc. vol. i^, pfc'. 3 (J900) pp. 130-35. 



2 Q. J. G. S. vol. lxvi (1910) p. 43S. 

 • 3 Ibid. pp. 427-28. 



