On the Geological Relations of the Rocks of the South of Ireland to those of North Devon and other British and Continental Districts

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Abstract
Having in a former communication to this Society* endeavoured to prove that the great series of purple and green grits and slates which form the southern highlands of Ireland belong to the Uppermost Silurian period, and that between them and the succeeding beds of the Old Red Sandstone there occurs everywhere a wide hiatus (a gap of unrepresented geological time), indicated not only by visible unconformities but also by absence of intervening beds at various points, it now becomes desirable to inquire, and, if possible, to determine what formations in other districts may be supposed to fill up the hiatus above referred to, and then, having determined this point, to see what inferences may be drawn concerning the physical geology of the regions referred to at the various stages indicated both by the presence and the absence of consecutive strata. This inquiry naturally leads one to cast a glance at the neighbouring coasts of England and Wales as the districts where light may be looked for on these questions; and I propose in the following pages to make a comparison of the series of beds in both countries, namely the South of Ireland and North Devon, and adjoining districts north of the Severn†. It will also be desirable, with a view to a fuller investigation, to refer, when necessary, to the Devonian and Carboniferous series as it occurs in Belgium and Scotland, and to see how far it is comparable with, and sustains our observations of, the Devonshire section. Views

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