. "Basanite. Igneous intrusive bedrock. Occurs onshore. Emplaced during the Early Mississippian Epoch - to - Westphalian Stage (Carboniferous Period) (359.3-307.5 Ma BP)."@en . . "BONTN"@en . "359.3"^^ . "Bonnington Intrusion (?Sill)"@en . "Basanite."@en . . "Bonnington Intrusion (?Sill)"@en . . . . "stable"@en . "307.5"^^ .