"330.3"^^ . "Elygrain Vent"@en . . . "ELYG"@en . "Pyroclastic breccia or agglomerate in vent, with intrusions of trachyte."@en . "Vent, elongate, c.200m x 1500m"@en . "359.3"^^ . . "Elygrain Vent"@en . . "Intrusive."@en . "stable"@en . "Intrusive."@en . . "Agglomerate and pyroclastic-breccia with subsidiary trachyte. Igneous intrusive bedrock. Occurs onshore. Emplaced during the Early Mississippian Epoch - to - Mid Mississippian Epoch (Carboniferous Period) (359.3-330.3 Ma BP)."@en . .