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Published online by Cambridge University Press: 01 May 2009
In a former paper the writer endeavoured to show the connection between the sedimentary rocks of Singapore and certain rocks in Pahang. On the occasions when opportunities for geological work in Singapore have presented themselves numerous specimens of igneous rocks have been collected, and it is the purpose of the present paper to describe briefly the observations recorded. It is hoped that this will give some further idea of the geology of the island of Singapore; but apart from a general description the pyroxene - bearing rocks associated with the granite appear to the writer to require a note as being of exceptional petrological interest.
page 17 note 1 Geol. Mag., 1908, pp. 289–91. The map with this paper will serve to show the position of Pulau Ubin in Changi.
page 17 note 2 Geol. Mag., 1901, pp. 128—34.
page 17 note 3 Logan, J. R., “Notices of the Geology of the Straits of Singapore” (withgeological map): Q.J.G.S., 1851, vol. vii, p. 310.CrossRefGoogle Scholar
page 21 note 1 A quantity of granite, from the part of the quarry where the roek c is deseribed as being mingled with it, was crushed, and the heavy minerals concentrated. Among them a few grains of the rhombic pyroxene were found, but this cannot be accepted as conclusive proof of the rhombic pyroxene being a constituent of the granite, as it may possibly have come from the other rock.
page 22 note 1 Easton, N. Wing, “Geologis cines teiles von West Bornco”: Jaarb. v. h. Mijnwezen in Ned-O.-Indie, Wetenschap. Gedeelte, Batavia, 1904.Google Scholar
page 22 note 2 Batavia, 1883.
page 22 note 3 Op. cit., pp. 205–6.
page 22 note 4 Op. cit., p. 210.
page 22 note 5 Holland, T. H., Mem. Geol. Surv. India, vol. xxviii, pt. iiGoogle Scholar, “The Charnockite Series, a group of Archæan hypersthenic roeks in Peninsular India.”
page 22 note 6 Rosenbusch, , Massige Gesteine, p. 60.Google Scholar
page 22 note 7 Zirkel, , Petrographie, vol. ii, p. 13.Google Scholar
page 22 note 8 Teall, J. J. H., “On some Quartz-Felsites and Augite Granites from the Cheviot District”: Geol. Mag., 1885, p. 115.Google Scholar
page 22 note 9 In “ The Rocks of Pulo (=Pulau) Ubin” (Verhandel. Bataviaasch. Genootsch. Kunst. Wetenschap., vol. xxiiGoogle Scholar, also published in Essays relating to Indo-China, ser. II vol. i, pp. 21–71Google Scholar) Logan notes a fine-grained rock, “blackish-green hornblende, or a very fine-grained black greenstone approaching basalt.” This may be the writer's c weathered. Logan also mentions, however, a remnant of a basalt dyke between Pulo (=Pulau) Tam (Kitam?) and the west point of Pulo (=Pulau) Ubin, and he noted a bit of basalt adhering to a large syenitic block. This very likely refers to basic dykes cutting the granite such as are known elsewhere. Logan's observations were made prior to 1847, and those acquainted with the tropics will realize that all trace of the exposures mentioned may have disappeared.
page 22 note 10 Rosenbusch (op. cit., p. 511) mentions hypersthene in a minette from near Freiburg and bronzite in Hartz Kersantites. The subordination of the biotite to the other ferromagnesian minerals in the Singapore rocks makes it necessary to regard them as vogesites.