"BASI"@en . . "stable"@en . . . "Ballyalton Sill"@en . . . "Igneous intrusive bedrock. Occurs onshore. Emplaced during the Paleogene Period (66-23.04 Ma BP)."@en . "Ballyalton Sill"@en . "66.0"^^ . . "23.04"^^ .