566 /. B. SCRIVENOR 



against a broad outcrop of quartzite forming rugged hills and rising, 

 on the Pahang-Kelantan border, to a height of 7,188 feet (Gunong 

 Tahan, the highest mountain in the Peninsula). This mass of 

 quartzite (No. 12) falls away to the north of the Pahang-Kelantan 

 border, but southward it extends beyond the Pahang River. In 

 the extreme south of Pahang and in Johore granite hills occur, and 

 outcrops of quartzite also, which are assumed to form a continuation 

 of this '/Tahan Coulisse"; and in Singapore Island the granite and 

 quartzite appear again, the latter weathered to sandstone with 

 Myophoria and other fossils. 



In the south this band of quartzite and granite is broken by 

 marine denudation. There are certainly intrusions of granite. 

 In the north the outcrop of quartzite is rugged, continuous, and on 

 the Pahang-Kelantan border, very high, but I have not seen any 

 granite outcrops in it, or any veins of aplite, or evidence of the 

 proximity of granite, such as tourmalinization. The nearest granite 

 known to me is a small outcrop close to the western edge of the 

 quartzite east of Pulai, but it is intrusive into Hmestone country. 

 It may be that, in the northern part, this mass of quartzite owes its 

 prominence simply to its power of resisting denudation; but there 

 is, as already mentioned, some evidence of folding, and in view of 

 the fact that the prolongation of the Peninsula to Singapore is due 

 to its existence and that of the hills marked 14, 15, 16 in Figure 2, 

 I think it is justifiable to name it the Tahan "Coulisse." 



The last of the ribs of the Peninsula is that marked 14, 15, 16 

 on the map. This may conveniently be referred to as the East 

 Coast Coulisse. Recent work shows that in the north it is a definite 

 granite range rising in Kelantan close to the sea. The granite 

 certainly extends a long way down the Trengganu border, and it is 

 believed that it reaches -the Pahang border, where the coulisse is 

 continued in hilly country of granite and altered sedimentary rocks. 

 These are broken by the allu\dal plain of the Pahang River, but 

 continue to the south as hills of sedimentary rocks with at least 

 one granite outcrop. On the Johore border large outcrops of granite 

 are known, and in Johore the coulisse is continued as more out- 

 crops of granite and sedimentary rocks, with volcanic rocks of 

 undetermined age, until it ends in the point east of Singapore. The 



