STRUCTURAL GEOLOGY OF BRITISH MALAYA 567 



granite of this coulisse is tin-bearing in the north of Pahang, the 

 South of Pahang, and in some locaHties in Johore. Tin and wolfram 

 deposits in Trengganu are probably connected with it, and in Kelan- 

 tan a little tin-ore is reported in it. It forms another tin-bearing 

 belt, not so well-defined as that formed by the Kerbau Coulisse and 

 other coulisses to the west of it. The gold-bearing belt hes between 

 the two. 



The island of Tiuman consists mostly of granite. The numerous 

 small islands nearer the coast are of rhyolite and granite. 



The Peninsula then has a skeleton of granite ribs from which 

 denudation has not yet removed the whole covering of bedded rocks. 

 In some cases, such as those marked on the map as Nos. i and 2, 

 the thickness of the cover remaining is considerable. In No. 9, 

 the Kerbau CouHsse, a small portion of the cover remains perched 

 at an altitude of 7,000 feet. Islands of schists and quartzite are 

 known at lesser elevations in No. 9, and masses of limestone are 

 found totally surrounded by granite on the surface in Nos. 9 and 

 8, all parts of the cover. 



These granite ribs are arranged en echelon: no one range can 

 be said truly to be the backbone of the Peninsula ; but if we refer to 

 Figure i, or Figure 72 on page 147 of Professor Hobbs' book, we 

 see that they are but the detailed wrinkles of one great band of fold- 

 ing that sweeps through the Peninsula and then, turning NE, 

 through the northern part of Borneo to the Philippines. 



Owing to the amount of the cover remaining, one can obtain a 

 fairly good idea of the profiles of the granite ribs when they first 

 consolidated. In Figure 2 I have drawn a line through some of the 

 coulisses, connecting the highest outcrops of granite. This hne, 

 starting at No. 3 (Gunong Perak, 2,823 ft.), and extending as far 

 as Benom, will be seen to have the same general direction as that 

 of the curve of the arc through the Peninsula and Borneo just 

 referred to. The line might be produced in the same direction 

 to No. 13 (Gunong Besar, 3,403 ft.) but there is some doubt about 

 its being all granite. In the East Coast Coulisse the highest 

 granite is far to the north of Gunong Besar, This fine, however, 

 joining the highest parts of the granite profiles of 3, 7, 8, 9, and 10, 

 is interesting as showing the probable trend of the first emergent 



