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OF THE KINTA. DISTRICT. 



197 



two steep granite-ranges, would probably dissolve the limestone to 

 such an extent that no glaciated pavement would exist. He agreed 

 with Mr. Scrivenor that no importance should be attached to the 

 absence of such a glaciated pavement. 



It was very difficult, as Dr. Thomas pointed out, to realize at 

 first what tropical weathering could do ; and only after great 

 familiarity with the rocks in the field could one confidently offer 

 an opinion. The speaker's mapping of the Ulu and Kuala Selangor 

 districts had afforded him much help in understanding the 

 structure of the Kinta district. 



The only difference stated to exist, between the tin-ore in the 

 ' clays and boulder-clays ' and that in the admittedly alluvial 

 deposits, is that in the former it is more angular. Mr. Scrivenor 

 published a photograph, in his memoir on the Kinta district, to 

 illustrate this point. It was significant, however, that the angular 

 ore there figured came from a mine (Siputeh) where a lode was 

 worked some years ago, and where cassiterite was definitely found 

 in situ in 1914 by the manager and the Author. Mr. Scrivenor, 

 in a lecture on ' Tin-Ore in Limestone ' 1 agreed that tin-ore had 

 been found recently in situ at this mine. 



Mr. Kitson was correct in stating that later developments had 

 yielded much information that was previously unobtainable. Mr. 

 Scrivenor still, however, believed in his theory ; his memoir and 

 map of this district were only published in 1913, and in a recent 

 paper in the ' Geological Magazine ' ( Jury 1914, p. 309) he stated 

 that the glacial theory is the one that best explains the facts seen 

 in the field. In the Annual Report of the Geological Department 

 of the Federated Malay States for 1913, he (the speaker) wrote 

 that in Ulu Selangor he had, in every case, traced the tin-ore 

 from the valleys, up the streams, to schists and granite where 

 tin-ore was definitely in situ. 



With regard to the boulders, Mr. Scrivenor stated that not a 

 single boulder showing undoubted glacial striae had ever been 

 found. Boulders were being continually washed out of the stanni- 

 ferous clays, and excellent opportunities were given for examining 

 thousands of them in the dump-heaps. 



He thanked the Fellows for the kind manner in which they had 

 received his paper, and for the interesting points raised in the 

 discussion. 



1 See ' Times of Malaya ' Ipoh, 1914, & P.M.S. Chamber of Mines publica- 

 tion of this lecture. 



Q. J. G. S. No. 287. 



