Letter | Published:

Gibbsite in Altered Granitic Rock in North Wales

Nature volume 204, pages 673674 (14 November 1964) | Download Citation

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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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References

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    , Quart. J. Geol. Soc., 86, 191 (1930).

  2. 2.

    , in The X-Ray Identification and Crystal Structure of Clay Minerals, edit. by Brown, G. (Min. Soc., London, 1961).

  3. 3.

    , in The Differential Thermal Investigation of Clays, edit. by Mackenzie, R. C. (Min. Soc., London, 1957).

  4. 4.

    , Composition and Origin of the Antrim Laterites and Bauxites (Geol. Surv., Belfast, 1952).

  5. 5.

    , The Ayrshire Bauxitic Clay (Geol. Surv., London, 1922).

  6. 6.

    , and , Min. Mag., 29, 1 (1950).

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Affiliations

  1. The Nature Conservancy, Penrhos Road, Bangor, Caernarvonshire.

    • DAVID F. BALL

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DOI

https://doi.org/10.1038/204673b0

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