Abstract
IN reference to the report in NATURE, vol. xi. p. 258, on Mr. Mallet's communication to the Royal Society, respecting the hexagonal crystallisation of basalt, I beg to offer to your readers a similar explanation of the columnar formation in some mud banks on the shores of some of the rivers in South Africa.
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BLACK, J. Columnar Formation in Mud Banks. Nature 11, 285 (1875). https://doi.org/10.1038/011285b0
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DOI: https://doi.org/10.1038/011285b0
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