Abstract
THE first suggestion that Cardigan Bay and the southern half of the Irish Sea might be floored by Mesozoic deposits was made by Jones1 on purely geological evidence. He pointed out that the radial drainage from Wales into Cardigan Bay could be explained if the Bay was underlain by a Triassic basin and that Cardigan Bay closely resembled the Cheshire plain in outline and dimension. This idea was used by Powell2 to explain gravity and magnetic anomalies found in a traverse from the Cambrian beds of the Harlech dome across the coastal sandhills south of Dyffryn Ardudwy (Fig. 1). A fault of considerable downthrow was considered to run along the coast from near Barmouth to Harlech, throwing down younger beds to the west.
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References
Jones, O. T., Quart. J. Geol. Soc., London, 107, 217 (1952).
Powell, D. W., Quart. J. Geol. Soc., London, 111, 388 (1956).
Griffiths, D. H., King, R. F., and Wilson, C. D. V., Quart. J. Geol. Soc., London, 117, 171 (1961).
Blundell, D. J., King, R. F., and Wilson, C. D. V., Quart. J. Geol. Soc., London, 120, 35 (1964).
Blundell, D. J., Davey, F. J., and Graves, L. J., Nature, 219, 55 (1968).
Welch, F. B. A., in Mem. Geol. Surv. Gt. Brit. (Wilson, V., et al.), 60 (1958).
Whitaker, A., Ann. Rep. Inst. Geol. Sci., for 1967 (in the press).
Arkell, W. J., Jurassic System in Great Britain, 181 (Oxford, 1933).
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WOOD, A., WOODLAND, A. Borehole at Mochras, West of Llanbedr, Merionethshire. Nature 219, 1352–1354 (1968). https://doi.org/10.1038/2191352a0
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DOI: https://doi.org/10.1038/2191352a0
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