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II.—Contributions to the Geology of Africa
Published online by Cambridge University Press: 01 May 2009
Extract
The following notes have been drawn up from a study of specimens which were collected by G. F. Scott Elliot, Esq., during the earlier of two recent expeditions in Africa. He followed the Nile to somewhat beyond the second cataract, and brought back more than 130 examples of various rocks. The collection was sent to University College for examination, which I was allowed to undertake by the kindness of Professor Bonney, to whom I am further indebted for much help and advice on points of difficulty. A detailed description has been furnished to Mr. Scott Elliot to be included in the account of his journey, which it is to be hoped will be published before long. It may, however, be useful to have a short summary of the chief points of geological interest for general reference in an easily accessible publication.
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References
page 436 note 1 See description of specimens by ProfBonney, T. G., in Geol. Mag. 1886, Dec. III. Vol. III. pp. 103–106CrossRefGoogle Scholar; ProfDawson, , Geol. Mag. 1888, pp. 439,440, 481,482Google Scholar; von Zittel, K. A., “Ueber den geolog. Bau der libyschen Wuste,” 1880, p. 9.Google Scholar
page 436 note 2 See references above; and also ‘Géol. de Palestine,” Lartet, M. L., p. 55Google Scholar. I have to thank Mr. L. L. Belinfante, B.Sc, the Curator of the Geological Society, for kindly giving me facility to examine the collection brought by Mr. J. C. Hawkshaw, which was interesting for comparison, and included some similar types.
page 437 note 1 Q.J.G.S. 1891, vol. xlvii. p. 497,Google Scholar Prof. Bonney and Major-Gen. McMahon on the Crystalline Rocks of the Lizard District. Q.J.G.S. 1892, vol. xlviii. pp. 132–138Google Scholar, Rev. E. Hill and Prof. Bonney, on the Hornblende Schists of Sark.
page 437 note 2 This specimen may possibly be related to a chlorite-scbist which has been described from the borders of Abyssinia.
page 437 note 3 GEOL. MAG. 1886, p. 106.Google Scholar
page 437 note 4 The hornblende is in clear rounded grains in one slide, which also contains a light-coloured augite similar to a variety shown to me in a Hebridean diorite by Prof. Bonney. Another of the hornblende-felspar rocks, as Prof. Bonney also pointed out, bears some resemblance to a foliated diorite in Guernsey.
page 438 note 1 The interfẹlted mass bears some resemblance to that in a nepheline syenite from Montreal, shown to me by Prof. Bonney.
page 438 note 2 Q. J. G. S. 1892, vol. xlviii. p. 131, fig. 3.Google Scholar
page 438 note 3 Q. J. G. S. 1891, vol. xlvii. p. 105. On a Contact-structure in the Syenite of Bradgate Park, by Prof. T. G. Bonney.Google Scholar
page 439 note 1 One specimen is from far south beyond Sarras; others from further north near Wady Halfa.
page 439 note 2 Mineralog. and Petrogr. Mittheil. Tschermak, G.. 1886, vol. viii. p. 24Google Scholar; Across East African Glaciers, DrMeyer, H., p. 347.Google Scholar
page 439 note 3 See Phillips, J. A, Q.J.G.S. 1881, vol. xxxvii. pl. ii. figs. 1, 2, 3, 5.Google Scholar
page 439 note 4 See Lartet, M. L., Géol. de Palestine, p. 57Google Scholar; similar specimens are described by Hawkshaw, J. C., Q.J.G.S., vol. xxiii. p. 116.Google Scholar
page 440 note 1 Colonial Reports. Miscellaneous, No. 3, Sierra Leone. Reports on Botany and Geology, 1893. I regret that, as I unfortunately missed seeing the proof of this paper, some printers' errors in it have escaped correction.
page 441 note 1 See also Phil. Trans. 1883, On a Collection of Rock Specimens from the Island of Socotra, Prof. T. G. Bonney. Also Geol. Mag. 1888, Dec. III. Vol. V. p. 414,Google Scholar Raisin, C. A., On some Rock-specimens from Somali Land; p. 504,Google Scholar On some Kockspecimens from Socotra.