Rushton, A.W.A., Owen, A.W., Owens, R.M. & Prigmore, J.K. 2000. British Cambrian to Ordovician Stratigraphy. Geological Conservation Review Series No. 18, JNCC, Peterborough, ISBN 1 86107 4727.

The original source material for these web pages has been made available by the JNCC under the Open Government Licence 3.0. Full details in the JNCC Open Data Policy

References

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Blake, J.F. (1892) On the rocks mapped as Cambrian in Caernarvonshire. Quarterly Journal of the Geological Society, London, 48, 243–61.

Blake, J.F. (1893) On the felsites and conglomerates between Bethesda and Llanllyfni, North Wales. Quarterly Journal of the Geological Society, London, 49, 441–65.

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