Abstract

The discovery of an arietitid ammonite (Bucklandi Zone), with evidence for the timing of its emplacement into Pleistocene deposits soon after oxygen isotope sub-stage 5e (5.5), is used to infer that the coastal plateau immediately north of Horton, Port Eynon Bay, is approximately coincident with an exhumed sub-Mesozoic surface. A resistivity survey of the overlying glacial Llanddewi Formation has revealed that this erosion surface is widespread in southwest Gower, thus confirming the hypothesis of A. E. Trueman that the ‘200 foot platform’ of Gower is an exhumed sub-Mesozoic surface.

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