Here the Ludlow strata are followed by a thick series of barren beds (the Dingle Beds), which have been variously claimed as Upper Silurian and Lower Devonian.
After the stern coast of county Clare there follow the estuary of the great river Shannon, and then three large inlets striking deep into the mountains of Kerry and Cork - Dingle Bay, Kenmare river and Bantry Bay, separating the prongs of the forklike south-western projection of the island.
In the Wenlock beds of the west of the Dingle promontory there are contemporaneous tuffs and lavas.
Of the island he marks the mouth of the river Iernos, by which the top of Dingle Bay called Castlemaine Harbour is perhaps intended.
In the Dingle Pro 'K.
No certain representative of the Dingle Beds has been traced elsewhere throughout the south of Ireland, where the Old Red Sandstone succeeds the uptilted Silurian strata with striking unconformity.