274 Review>i — Geological Survei/ of New Zealand. 



Tlie author describes some of the igneous rocks, granophvre, audesite, 

 dacite, dolerite, etc. He comments on the association of Radiolarian 

 chert and lava, and on the views expressed on the subject by Mr. H. 

 Dewey & Dr. J. S. Flett.' The newest rocks, apart from Alluvium, 

 are small dykes of dolerite whicli cut the granite, and are almost 

 certainly of Tertiary age. 



With regard to the mining, gold has been obtained from alluvial 

 deposits and from weathered rocks in sufficient quantity to repay 

 a Malaj', but not a white miner "unless he chose to live like a Malay" . 

 Two mines are still being Avorked in lodes in the llaub Series. The 

 greater part of TJlu Pahang produces no tin-ore, and the author fears 

 it never will be obtained in anj- part in large quantities. 



Mr. Scrivenor has also })ublished Notes on prosjjecting for Tin-ore in 

 the Federated Mnlay States (Kuala Lumpur, 1911). 



IV. — Geological Survey of New Zealand. — Bulletin No. 13 (New 

 Series), issued by the Department of Mines, consists of a memoir on 

 The Geology of the Greymouth Suhdirision, North Westland, by 

 Mr. Percy G. Morgan (Wellington, 1911, pp. 159). This work is 

 illustrated by four detailed geological maps and three sections, 

 together with special maps of the Kotuku Oilfield and Greymouth 

 Coal-tield, and sundry pictorial views and text-illustrations. The 

 district lies on the western side of the southern island, and contains 

 the following geological formations : Palceozoic, Greenland Series, 

 composed of argillites and grauwackes that may be of any age from 

 Ordovician to Carboniferous ; Eocene, Coal-measures ; Miocene, Grej'- 

 mouth Series, mudstones, sandstones, limestones, and conglomerates; 

 Pliocene, sandstones, lignite, and gravels ; Pleistocene, glacial, fluviatile, 

 and marine deposits ; and Recent, fluviatile and marine gravels and 

 sands. Igneous rocks include granite of an age newer than the 

 Greenland Series and pre-Tertiary, and basic dykes that may be 

 slightly younger tlian the granite. 



The Greenlanol Series has yielded some metalliferous quartz-veins 

 with gold and ores of antimony, but there has been little lode-mining : 

 gold has been obtained in some abundance mainly in the Eecent 

 alluvial deposits, to some extent in Pleistocene deposits, and in small 

 quantities in Pliocene and earlier Tertiary accumulations. 



While mining is the chief industry, that of coal-mining is by far the 

 most important ; the output for 1910 was 466,661 tons, and the total 

 amount of coal raised since 1890 is estimated at nearly six million tons. 

 Considerable increase is anticipated in the output of coal. It is stated 

 that favourable conditions for the occurrence of petroleum in quantity 

 seem to exist, but until deeper trial-holes have been put down the 

 matter cannot be settled. Notes are given of other mineral products, 

 of building-stones, materials for brick-making, cement, etc. From an 

 agricultural point of view there is little arable land, but much grass 

 land suitable for cattle-grazing, good timber land, and some ground 

 adapted for fruit-farming. 



* Geol. Mag., 1911, pp. 202, 241. 



