Abstract
DURING recent investigation of some welded tuffs in the Ordovician rocks of eastern Murrisk, County Mayo, lenses of sillar, non-welded material were encountered at the base of the tuff-horizons. Similar layers had previously been reported by Stanton1 and Dewey2 during investigations farther west. Stanton1 interpreted the variation in thickness of the sillar material as due to differences in the depth of sea-water present before the tuff built up to sea-level, prior to it becoming a truly welded tuff. The entire process was regarded as a ‘continuous whole’.
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References
Stanton, W. I., Quart. J. Geol. Soc. Lond., 116, 269 (1960).
Dewey, J. F., Quart. J. Geol. Soc. Lond., 119, 313 (1963).
MacGregor, A. G., Nature, 157, 305 (1946).
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MCMANUS, J. Observations on the Mont Pelée Eruption of 1902 and their Significance to Ordovician Welded Tuffs of County Mayo, Eire. Nature 208, 578 (1965). https://doi.org/10.1038/208578a0
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DOI: https://doi.org/10.1038/208578a0
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