Notices of Memoirs — J. B. Scrivenor — The Tahan Range. 373 



the underlying crystalline rocks is original, and not due to movement, 

 it may be mentioned that it presented similar features at most of the 

 other exposures which were examined. These lay along the even 

 upper surface of the basement-platform, where, on Carez' hypothesis, 

 pronounced evidence of overthrusting would be expected. And 

 even in the banks of the Maillet stream in the cirque de Troumouse 

 (PI. XVIII, Fig. 2), where the junction is disturbed by shearing, 

 accompanied by mylonisation of the limestone, it does not coincide 

 in direction with the movement, which is probably connected with 

 the adjacent overthrust previously described. 



{To he concluded in our next Ntimher.) 



ISrOTIOES OIF DVLEls/IOIRS. 



I. — The Geology of the Tahak Range. ^ Bj- J. B. Sckivenor, 

 Geologist, r.M.S. 



THE following account of the geology of the Tahan Bange is 

 based chiefly on notes collected during an ascent of Gunong 

 Tahan in May, 1906, and subsequent journeys in Pahang. 



The Tahan Range is remarkable in being composed almost entirely, 

 as far as is known, of a series of estuarine rocks — comprising shale, 

 sandstone, grit, and conglomerate — which is provisionally named the 

 Tembeling iSeries. The main range of the Peninsula, which, although 

 greatly more extensive in length, rises very little higher than Gunong 

 Tahan, is believed to be all granite and its modifications, but for 

 occasional areas of schistose rocks, representing altered sediments. 



Two ranges, similar to the Tahan Range, but on a smaller scale, 

 are known in the Federated Malay States. One of these is a long 

 range of low hills in the west of Pahang, parallel to the main range, 

 and referred to elsewhere as the Bentong-Telom Range ; the other is 

 the small isolated Semanggol Range, forming the border between 

 Larut and Krian in Perak. 



No direct evidence of the age of this series of estuarine rocks has 

 yet been derived from the Tembeling District of Pahang ; but fossils 

 discovered elsewhere point to a range in time dating from the Rheetic 

 to the Inferior Oolite. The collections made, however, are not 

 numerous, either in specimens or species. 



The breadth of the outcrop of the Tembeling Series in the typical 

 district is about thirty-five miles. The strike is roughly N.N.W.-S.S.E., 

 and there is reason to suppose that the series extends into Johore, 

 reappearing as far south as Singapore. The Tahan Range lies on the 

 western side of the outcrop. It would appear that the Tembeling 

 River, whose general course in the upper reaches is to the west, has 

 been turned south by this enormous barrier. 



^ From the Jouru. Federated Malay States Museum, vol. iii, January 29th, 190^ 

 (printed April, 1908). 



