Abstract
MY attention was directed by the Nature Conservancy's chief warden for Snowdonia, Mr. Evan Roberts, to an unusual form of rock weathering on the ridge of Y Llymllwyd, which projects into Nant Ffrancon between Cwm Cywion and Cwm Coch. These are two well-developed late-glacial corries. The rock in question is exposed over an area of about 100 sq. m. in a col on the crest of the ridge at approximately 750 m (2,450 ft.), O.D., grid reference SH 631609.
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BALL, D. Gibbsite in Altered Granitic Rock in North Wales. Nature 204, 673–674 (1964). https://doi.org/10.1038/204673b0
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DOI: https://doi.org/10.1038/204673b0
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