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Published online by Cambridge University Press: 01 May 2009
During the course of several journeys from the port of Zeilah southwards across the Ban or Plain to Buramo on the Abyssinian frontier, collections were made of characteristic crystalline rock groups in the hope of elucidating to some degree the composition and early history of the district. Permission to publish these notes was kindly given by the Colonial Office.
page 365 note 1 Farquharson, R. A., The Geology and Mineral Resources of British Somaliland, 1924.Google Scholar
page 365 note 2 Macfadyen, W. A., Geology of British Somaliland, App. i, p. 42, 1933.Google Scholar
page 365 note 3 GEOL. MAG., LXIX, 1932, 517–520.Google Scholar This contains a sketch-map, giving the positions of places mentioned in present paper.Google Scholar Also Stefanini, G., Consiglio Naz. delle Ricerche, “Saggio di una carta Geologica dell' Eritrea, della Somalia e dell' Etiopia,” Florence, 1933, 1: 2,000,000.Google Scholar
page 366 note 1 See Harker in Macfadyen, 1933, op. cit., p. 42, for a biotite-gneiss of hybrid origin occurring at Gumbur Gududan, some 50 miles E.N.E. of Sheikh.Google Scholar
page 366 note 2 ibid.Cf. the hornblende-schists of the Suk Hills, Quart. Journ. Geol. Soc., lxxxii,. 1926, 586, and, lxxxiii, 1927, 790.
page 367 note 1 A sandy drainage channel, dry except in rainy seasons.Google Scholar
page 369 note 1 Farquharson, Cf., op. cit., p. 9. A list of localities of his “hornblende-gneiss” is given. Also Harker in Macfadyen, op. cit., app. i, p. 42. Sheikh is 140 miles due east of Buramo.Google Scholar
page 369 note 2 Raisin, C. A., Quart. Journ. Geol. Soc., lix, 1903, 294, and GEOL. MAG., 1888, p. 414.Google Scholar
page 370 note 1 For the system of faults in the adjoining territory of French Somaliland see the map and memoir by Maurice Dreyfuss, Rev. Géogr. Physique et de Géol. Dynamique, iv, fasc. 4, 1931. For the fault system of the eastern part of the area described now, see Wyllie and Smellie, Mem. Geol. Dep. Hunterian Mus. Glasgow, pi. i, opp. p. 180, and the Geological Map of the Protectorate by W. A. Macfadyen accompanying his Geol. of British Somaliland. The present writer believes a N.E.-S.W. fault occurs near the Anglo-French frontier. It is note-worthy that the crystalline rocks do not appear in French Somaliland until the northern part of that Colony is reached.Google Scholar
page 371 note 1 Metamorphism, 1932, p. 288, fig. 149.Google Scholar
page 372 note 1 In Macfadyen, op. cit., App. i, p. 43.Google Scholar
page 373 note 1 With these may be included, at least temporarily, the quartz and graphitic gneisses recorded by Farquharson from the Ulahleh Tug (? Yubalen) (op. cit., p. 10). Possibly the products of thermal metamorphism mentioned by Harker (Macfadyen, op. cit., p. 43) from Gumbar Gududan, near the centre of the Protectorate, belong to this group.Google Scholar
page 377 note 1 Tanganyika Terr. Geol. Sur. Dept. Bull., No. 6, 1933, p. 3.Google Scholar
page 377 note 2 Ibid.No. 7, 1935, p. 9.
page 377 note 3 Gregory, , “Coll. of Fossils and Rocks from Somaliland,” Monog. Geol. Dept. Hunterian Mus. Glasgow, No. 2, 1925, p. 3.Google Scholar
page 377 note 4 Harker, , in Macfadyen, op. cit., p. 42.Google Scholar