Abstract

Written contribution from Dr P. T. WalshIn a paper to the Society in 1965, I drew attention to the geomorphological significance of the Ballydeenlea Senonian Chalk outlier at its altitude of about 120 m. A.S.L. It was suggested that the Chalk mass represented a karstic subsidence of sea-floor deposits, the subsidence being of the order of perhaps 100 m, thus placing the sub-Senonian Palaeozoic surface at the head of Dingle Bay at more than 480 m, and possibly as much as 800 m below the supposed ‘summit level surface’ in that part of Kerry. In discussing whether or not the Dingle Bay area could thus be interpreted essentially as an exhumed sub-Senonian landscape, I further drew attention to the significance of the minimum scale and style of post- Cretaceous synclinal folding which would be necessary for the Chalk also to cover the adjacent ranges of the Iveragh and Dingle peninsulas. It was demonstrated that the post-Cretaceous structural elevation of the Slieve Mish Anticline to the north of Dingle Bay would necessarily be about one-half of that achieved by the pre-Senonian movements on the base of the Carboniferous (Walsh I966 , Fig. 6). The writer thus welcomes the structural picture of the Cretaceous and post-Cretaceous rocks off the southern Irish coast that has emerged from geophysical evidence as providing further indirect evidence that it is unlikely that strong post-Cretaceous folding has affected the Munster fold-arc. However, it would be desirable to await further detailed reports on marine

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