Note on a Geological Reconnaissance made in Arabia Petræa in the Spring of 1868

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Abstract
T he following communication is of an essentially unsystematic nature. Owing to the small amount of country traversed, it has not been possible to construct anything more than a single line of section, which it is believed will be more acceptable as a contribution to exact Geology than an attempt to frame a general geological map of the whole country from observations made at only a few points. The order followed is, therefore, that in which the sections were observed, making it, as the title implies, more of a geological itinerary than a systematic description. The country included in the description is that between Suez and the lower part of Wady Ferran, the crystalline rocks of Sinai and the Tertiary beds near Túr being reserved for another communication, as I have not sufficient time at command to describe them in the present paper. General Outline .—As regards its physical outline, the western side of the peninsula of Arabia Petræa, or that part of it under immediate consideration, between Suez on the north and Túr on the south, along the coast of the Red Sea, together with the high ground behind, up to the culminating point of the country on the ridge of Sinai, may be best described as forming a series of comparatively level masses, arranged in steps or table-lands varying in height according to their distance from the coast. Through these steps have been cut a number of valleys, comparatively deep and of tortuous course, the general level of the plains

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