Foynes island lies in the Shannon river about 20 miles west of Limerick, western Eire. The strata consist of about 1,150 feet of Millstone Grit of upper Carboniferous age (Namurian). The type localities for the goniatites Reticuloceras subreticulatum and Homoceratoides divaricatus are on the island, and the exact stratigraphic horizon of the type material has been ascertained. The succession is compared with that at Lisdoonvarna in Clare county.

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