. . . . "359.3"^^ . "330.3"^^ . "stable"@en . "Castle Hill Plug"@en . "CAHIL"@en . "Castle Hill Plug"@en . . . "Olivine-macrophyric basalt. Igneous intrusive bedrock. Occurs onshore. Emplaced during the Early Mississippian Epoch - to - Mid Mississippian Epoch (Carboniferous Period) (359.3-330.3 Ma BP)."@en . "Olivine-macrophyric basalt."@en .