Devonian Igneous rocks Lough Guitane volcanic complex Paleozoic Petrology Rhyolites Upper Devonian Volcanic rocks Accessory minerals Accuracy Bennaunmore volcanic center Cappagh Fault Clastic rocks Composition Conglomerate Dikes Eruptions Faults Grabens Green Sandstone Formation Intrusions Lava flows Major elements Mangerton Anticlinorium Materials Mathematical models Metals Metamorphism Metasomatism Munster Basin