﻿168 



DR. W. li. JOKES OK THE SECOKDAKY 



[vol. lxxii,. 



and western boundaries, 1 and there is a very small gradual rise 

 from south to north. 



West of the Kinta River, from near Lahat to Tanjong Toh 

 Allang, a distance of more than 12 miles, there is, however, a stretch 

 of undulating ground at a higher level than the rest of the valley 

 and skirted by the road from Tanjong Toh Allang to Batu Gajah,. 

 being cut through by it at Rotan Dahan, between Batu Gajah 

 and Fusing Lama. Exposures of the rock composing this stretch 

 of ground may be seen at Kacha, Rotan Dahan, in numerous 

 places at Batu Gajah, and it forms the bed-rock in the small 

 watercourses on the Harewood and Kinta Valley Estates. 



At Kacha the rock is a decomposed mica-schist, dark blue in 

 places. The schist preserves its foliation, and contains granitic 

 intrusions carrying tin-ore. Tourmaline-corundum rocks are found 

 here in situ, and small kaolin-veins are common. Pits have 

 been sunk in the schist, and small leaders, carrying tin -ore, have 

 been followed. Two such pits reached a kaolin-vein in which 

 the kaolin was perfectly white, and had all the characters of a 

 kaolin-vein in situ. The dark-blue clay in a mine at the foot of 

 Kacha Hill can be traced from a typical soft structureless clay, 

 through clay exhibiting traces of foliation, to partly-decomposed 

 phyllites and schists showing distinct foliation-planes. 



At Red Hills, which forms a distinct feature in the Kinta 

 A 7 alley, on account of the rising ground and the dark-red colour of 

 its numerous cuttings, the phyllites exposed in parts are dark blue ; 

 but in many localities the disseminated pyrite has been oxidized, 

 and the rock is heavily ferruginized. Granitic intrusions are 

 numerous, and these have been found in places to carry work- 

 able amounts of cassiterite. Parts of the phyllites are barren of 

 tin-ore. Tourmaline-corundum rocks are numerous, and are found 

 here in situ,. 



This feature is continued into that part of Rotan Dahan which 

 lies on the north side of the road from Batu Gajah to Pusing ; 

 and south of the road it has been cut through by the drainage- 

 system of the valley. 



Numerous exposures of the phyllites and indurated shales which 

 form this high ground may be seen on the eastern flanks at 

 Batu Gajah, on the Harewood and Kinta Valley Estates ; and a 

 very good exposure showing the high angle of the foliation -planes 

 may be seen along the bridle-path from Batu Gajah to Siputeh, 

 near the Batu Gajah end. The more shaly parts are jet-black, 

 and have been mistaken by some observers for coal ; these are well 

 exposed in the drains running through the coeoanut plantation 

 below the Batu Gajah Club. 



Separated from this stretch of high ground by the Kinta River 

 are two other prominent masses, one on each side of the Sungei 

 Raia. The northern area contains the Pinji and the Sengat 

 Rubber Estates, and the southern the Kellas Estate. The two 



1 See the accompanying section across the Kinta District (PI. XV). 



