Lithological Control of High-Water Rock Ledges in the Vale of Glamorgan, Wales

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Abstract
Ledges at, or somewhat above high tide level have been the subject of considerable controversy regarding the question of whether such ledges provide evidence of a former higher sea level. In the macro- tidal, storm wave environment of the Vale of Glamorgan, ledges are related to lithological controls, contemporary storm wave activity and changes in sea level. In the Liassic outcrops, analysis of the detailed lithology demonstrates that the ledges occupy the most favourable lithological locations. Therefore such ledges cannot simply be correlated on the basis of height with the level of a former sea. The form of the ledges appears to provide both evidence of former sea levels at about 5 m and 1–2 m above its present level, and also significant indications of the potency of contemporary storm wave activity. It is considered that both greater appreciation of the influence of lithology on ledge formation, and the recognition of high intensity, low frequency storm wave attack, must precede the utilization of high-water rock ledges for the reconstruction of former sea levels.

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