Revieivs — Geology of Federated Malay States. 223 



accustomed skill by Miss Gertrude M. Woodward, and form a great 

 enhancement to this valuable work. The admirable plates, thirteen 

 in number as compared with ten in the iirst volume, are mainly 

 devoted to skulls of which more specimens are forthcoming than in 

 the sections dealt with in the companion volume, rather, indeed, to the 

 exclusion of other parts of the skeleton. The reduction in size of 

 many of the text-figures is a great improvement to their appearance, 

 while detracting nothing from their value. 



May we hope that the success which has attended the publication 

 of this Catalogue of the first rank may induce the Trustees to 

 sanction the productipn of a companion volume on a similar scale 

 which shall bring together the remainder of the remarkable treasures 

 of the Leeds Collection, namely, the Fishes and the Dinosaurs, with, 

 perhaps, the tail of Leedsia prollematica as a frontispiece? 



IV. — Geology or the Fedeeated Malay States. 



The Geology and Mining Indxjsthy of the Kinta District, Peeak, 

 Federated Malay States. With a geological sketch-map. Bj^ 

 J. B. ScRivENOR, M.A., F.G.S. 8vo; pp. 91, with 11 text- 

 illustrations and 20 plates. Kuala Lumpur, 1913. Price 

 3 dollars (about 5s. 3^;.).^ 



THIS memoir is descriptive of a tract in the north-western part of 

 the States, the Kinta lliver, which traverses the area, being one 

 of the chief tributaries of the Perak lliver. Granite mountains, 

 the Main Pange and the Kledang Pange, border the country on the 

 east and north-west respectively, while the intervening valley region 

 is occupied firstly by limestone, containing pipes and fissures with 

 detrital tin-ore, and then by coverings of Gondwana Beds and 

 superficial deposits. It has not been deemed advisable to colour on 

 the map the Alluvial beds, as they somewhat obscure the metalliferous 

 strata, and the object is essentially a practical one. In old days the 

 recent Alluvium was an important source of tin-ore, but this is no 

 longer the case. 



The limestone forms a rugged floor to the valley, but it is difficult 

 in many places near the river to determine the limits of the overlying 

 clayey and sandy strata of the Gondwana formation. In several 

 localities the limestone rises in precipitous hills due primarily to 

 displacement, the cliffs in fact being fault-faces with the basement 

 Gondwana rocks (Gopeng Beds) faulted down against them. 



There is evidence that the limestone and Gondwana rocks were 

 covered at one time by " a huge pile of younger rocks ", and that all 

 were crushed and folded, and bent as a whole into a low anticline. 

 These disturbances were caused by the intrusion of the granite, which 

 was probably separated at some depth from the limestone by 

 "a considerable thickness of still older rocks" that were broken up 

 "and perhaps completely dissolved in the granite magma". The 

 granite is stanniferous, and prior to its complete solidification " spurts 

 of vapour and molten rock, carrying tin amongst other things " 



■^ On sale at the Malay States Agency, 88 Cannon Street, London, E.G. 



