STRUCTURAL GEOLOGY OF BRITISH MALAYA 565 



rocks before reaching the Kelantan border, a few small outcrops of 

 granite and granite-porphyry only being found. To the south it 

 continues into Negri Sembilan, where it disappears under the cal- 

 careous series close to the granite of the Kerbau Coulisse. Horn- 

 blende-granite has not been found at this end, but Mr. E. S. Will- 

 bourn mentions boulders of quartz-diorite.^ 



Beyond the Kerbau and Benom Coulisses is Mount Ophir 

 (No. 11), 4,187 feet. This is an isolated mountain of granite, but, 

 it may be assumed, connected at no great depth with the granite 

 of the Kerbau CouHsse, which, in turn, must be connected at no 

 great depth with the granite of the Benom Coulisse, the last-named 

 being best regarded as a large spur given off by the Kerbau CouHsse. 



To the north of the Benom CouHsse there is a large tract of 

 country in Kelantan that has been only partially explored. In the 

 vicinity of Pulai muscovite-aplite intrusive in limestone may be 

 connected with the Benom granite. Farther north, in the branch 

 of the Kelantan River rising in the Kerbau CouHsse, and on the 

 Hne of strike of the Benom granite, pyroxene-granite-porphyry, 

 biotite-granite, and pebbles of a hornblendic rock, probably diorite, 

 have been found in country largely consisting of limestone. If the 

 line of strike is continued farther still, it joins the Kerbau CouHsse 

 south of Tomo, and in the neighborhood of Tomo are the small 

 intrusions of diorite and hornblende-granite mentioned above. This 

 line of strike of the Benom granite, from Negri Sembilan in the 

 south, through Pulai, to Tomo in the north, passes through the 

 gold-bearing belt of the Peninsula, which is sharply differentiated 

 from the chief tin-bearing belt to the west. Much of the gold has 

 been derived from rocks of the Pahang Volcanic Series, but some is 

 found in country where the hornblende-granite and diorite occur, 

 these appearing to be the source in certain areas. Continued work 

 may reveal something more definite about the relation of these 

 hornblendic rocks in Kelantan to the granite of the Kerbau Coulisse 

 and the rocks of the Benom Coulisse. 



East of the Benom granite in Pahang and in the country about 

 Pulai in Kelantan, Hmestone is abundant, but it ends abruptly 



' "An Account of the Geology and Mining Industries of South Selangor and Negri 

 Sembilan," Geol. Dept. F.N.S., 1922, p. 35. 



