Colonial coral, lithostrotion, from Carboniferous limestone Ballykyne, Clonbur.
Silurian rugose coral, Kilbride.
Dalradian schist, a type of rock usually with a distinctive shiny surface, was produced enormous pressure on ancient muds or other deposits. The source materials have been greatly altered so that mineral grains have been elongated in one direction.
Ignimbrite, Ordovician, near Lough Nafoofey. Evidence of pyroclastic flow, during a violent volcanic explosion.
Graphite, Dalradian, Kilbride Quarry, near Doon Rock, Co Mayo. Carboniferous, limestone by Petersburg, Crinoid fossils stand out from the weathered limestone.