Abstract
I THINK Mr. Crossland, in his letter to NATURE of April 3, is in assigning a fault origin to the narrow “khors” which form the harbours along the Rea Sea coast. I visited a number of these during a land journey from Halaib to Port Sudan in 1908, and although I had not much time for detailed investigation, I saw nothing which pointed to any other origin than erosion and subsidence. The steep-sided character of the shallow valleys, which Mr. Crossland takes as indicative of a fault origin, is, I think, merely a consequence of the toughness of the coral-rock and the smallness of the rainfall in these regions. It is a character common to many inland “wadis” where there is no suspicion of rift action.
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BALL, J. Dana's Proof of Darwin's Theory of Coral Reefs. Nature 91, 296 (1913). https://doi.org/10.1038/091296b0
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DOI: https://doi.org/10.1038/091296b0
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