564 J. B. SCRIVENOR 



thousand feet, and a little farther north are two more. Of the 

 three near the junction of the state boundaries, one, Kerbau 

 (7,160 ft.) is known to be capped by altered sediments, so that on 

 this mountain we have the original limit of the granite ridge. 



Farther south than Kerbau, just on the bend of the coulisse, a 

 large outcrop of schists and quartzite is known on the Pahang side 

 at an altitude of three to four thousand feet, surrounded by granite; 

 and on the opposite side of the range, at Chanderiang, a long tongue 

 of limestone, under alluvium worked for tin-ore, is almost sur- 

 rounded by granite. Farther south still, in Selangor, there is 

 another outcrop of calcareous rocks in the granite at Kanching, 

 part being a prominent Hmestone hill, and also an outcrop of altered 

 sedimentary rocks in the granite near Kuala Kubu. 



In the southern half of the Kerbau Coulisse the granite hills 

 fall away gradually. Near the bend Batu Puteh is 6,987 feet. 

 Near the Selangor border Gunong Liang is 6,431 feet; in Selangor 

 Ulu Kali is 5,820 feet. In Negri Sembilan the mountains are under 

 4,000 feet, and in Malacca they die away altogether; but the 

 coulisse is continued to Banka, the intervening gaps being caused 

 by marine denudation. 



In Selangor and Pahang tin-deposits are found high up in the 

 mountains of this coulisse, in some cases on the watershed. As 

 tin-deposits in a granite mass are generally peripheral, this suggests 

 that httle granite has been removed from the top of the ridge by 

 denudation. 



On the east side the Kerbau CouHsse is flanked in Pahang by a 

 well-defined range of quartzite foothills. Beyond this, at Raub 

 and to the north and south of Raub, the calcareous series is exposed 

 over a wide area until the Benom CouHsse is encountered. The 

 calcareous rocks are found to the east of this coulisse also, in the 

 wide valley of the Pahang River, and are there covered in places by 

 sandstone and shale in which there is a Rhaetic horizon, the Myo- 

 phoria Sandstone described by Mr. R. B. Newton." In the Benom 

 CouHsse the only high peak is Gunong Benom, 6,916 ft. The rock 

 is mostly hornblende-granite; there is some syenite. To the north 

 the plutonic mass disappears under the sedimentary and calcareous 



' Proc. Malacological Society, Vol. IV, Part 3 (October 1900), pp. 130-35. 



