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STANNIFEROUS DEPOSITS OP KINTA DISTRICT. 



191 



In the famous valley round Kuala Lurnpur, the numerous well- 

 rounded pebbles in the deposits may be cited as only one of several 

 pieces of evidence which show conclusively that the beds are of 

 alluvial origin. 



The tin -ore of Negri Sembilan (Federated Malay States) occurs 

 in alluvial deposits and as stockworks in phyllites and schists, and 

 the granite has proved stanniferous in places. The same is true 

 of such tin-ore as is found in Johore. 



The deposits of Banca and Billiton, 1 and the few deposits of 

 Sumatra 3 are alluvial and occur near exposures of granite. Those 

 of Siam lie close to granite outcrops and are of alluvial origin ; 

 and those of Burma 3 have been shown by the officers of the Geo- 

 logical Survey of India to be alluvial deposits of post-Tertiary age. 4 

 In French lndo-China, 5 and in Yunnan, 6 the tin-ore is derived from 

 the breaking-down of rocks near granite or granitic intrusions. 



VII. The ' Glacial Clays ' op the Kinta District cannot 



BE CORRELATED WITH THE TALCHIR BEDS OP INDIA. 



In the absence of proof that the stanniferous clays of Kinta 

 are of glacial origin, the most important, if not the only, grounds 

 on which they have been correlated with the Talchir Beds of India 

 have been removed, for ' climatic evidence ' is stated to have fur- 

 nished for this purpose a more valuable horizon than palseontological 

 evidence. 



Further difficulty in accepting the correlation is experienced by 

 the remarkable difference in sequence of the supposed Gonclwana 

 Rocks of Malaya and those of India. In Malaya beds at the base 

 of the 'Older Gondwana Rocks' are stated to pass up gradually 

 into those of the ' Younger Gondwana Rocks,' and the junction 

 between them is said to be' ' so obscure that it is impossible to draw 

 a line between them.' 7 Now, the Younger Gondwana Rocks of 



1 P. Van Diest, ' Banca & its Tin Stream-Works ' transl. by C. Le Neve 

 Foster, 1867 ; S. Fawns, ' Tin-Deposits of the World ' 1905, p. 35 ; J. A. Phillips 

 & H. Louis, ' A Treatise on Ore-Deposits ' 1896, p. 610. 



2 'A Treatise on Ore-Deposits' 1896, p. 610; also 'The Alluvial Tin- 

 Deposits ; Siak, Sumatra ' Trans. Am. Inst. Eng. vol. xx (1892) pp. 50-84. 



3 [Subsequent to the reading of this paper I have spent many months at 

 Tavoy (Burma) and have familiarized myself with the occurrezice of wolfram 

 and tin-ore in that district. Almost the whole of the wolfram is obtained 

 from rocks decomposed in situ,ov from lodes traversing granite, mica- schists, 

 and phyllites. Tin-ore is found associated with wolfram in the lodes and 

 detrital deposits, and is occasionally found in alluvial deposits which, owing 

 to the extremely perfect cleavage into thin flakes of wolfram and to its in- 

 stability in a moist troijical climate, carry relatively very little of this latter 

 mineral.] 



4 Bee. Geol. Surv. India, vol. xxii, pt. 3 (1889) p. 188. 



5 L. Gascuel, ' Gisements Stanniferes au Laos Francais ' Ann. Mines, ser. 10, 

 vol. viii (1905) pp. 321-31. 



6 ' Tin- Mining in China ' Mining Journal, vol. cix (1915) pp. 397, 439. 



7 J. B. Scrivenor, ' The Geology & Mining Industry of the Kinta District ' 

 1913, p. 45. 



