Igneous Rocks from the Central Libyan Desert

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Abstract
T he specimens described and discussed by the senior author in this paper comprise the most interesting members of a general collection made by Mr. R. F. Peel while accompanying Major R. A. Bagnold's 1938 expedition into the Libyan Desert. The general account of the Travels and work of this expedition has already been given (Bagnold and others 1939) and details need not be repeated here. It is sufficient to state that most of the two months’ stay in the desert was spent in the extreme south-west of Egypt and the adjoining parts of Libya and the Sudan, in the neighbourhood of the Gilf kebir plateau and Gebel Uweinat. No specific geological work was planned by the expedition, but in the course of exploration and survey new discoveries were made, mainly of volcanic plugs and craters. The sedimentary rocks collectd have, on examination, yielded no new features of particular interest, and, with the exception of certain contact-metamorphosed sandstones, no mention of them will be made here. I. G eneral G eology and T opography of the R egion T he fullest description of the geology of this part of the Libyan Desert is given by K. S. Sandford (1935a, b). Geologically, the region is dominated by the sandstones, pebble-beds and occasional shales of the Nubian Series. These formations, of doubtful age, but probably mainly Mesozoic (Sandford 1935a, 1937), are distubed by local folding and warping, particularly around Gebel ‘Uweinat, but over great areas are horizontal. The prevailing topography is in harmony with this simple structure: level

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