Petrographic Description of Volcanic Rocks from Turkana, Kenya Colony, with notes on their Field Occurrence from the manuscript of Mr. A. M. Champion

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Abstract
The province of Turkana in Kenya Colony comprises a tract of country west of Lake Rudolf bounded on the north by the Anglo-Egyptian Sudan and on the west by Uganda. It covers an area of about 27,000 square miles, and until recently the geology was entirely unknown. During his term of office as Provincial Commissioner, Mr. Arthur M. Champion surveyed the country and made a large collection of specimens of rocks and careful observations on the geology, particularly the physical geology, of the region. During his administration, Turkana was visited by two scientific expeditions, one under the leadership of M. C. Arambourg in 1932–3, and one led by Dr. V. E. Fuchs in 1934. M. Arambourg's expedition was directed mainly towards the investigation of beds rich in mammalian remains, discovered in 1902–3 during the expedition of le Vicomte Robert du Bourg de Bozas in the lower part of the valley of the Omo at the north end of Lake Rudolf. In the course of the expedition he made some observations on the volcanic rocks, and the petrography of his specimens has been written by Mme E. Jérémine (1935). These specimens I was privileged to study in the Mineralogy Department of the Muséum national d'Histoire naturelle at Paris in the spring of 1937 by the courtesy of Professor Orcel and Mme Jérémine. An account of Dr. Fuchs's expedition has been published (1935) and the geological results will be available shortly. I have been privileged to examine his specimens, but although he

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