"Belhaven Point Vent"@en . . . "Belhaven Point Vent"@en . "359.3"^^ . . . . "330.3"^^ . "Agglomerate, basanite and tuff."@en . . "BHVN"@en . "stable"@en . "Agglomerate, basanite and tuff. Igneous intrusive bedrock. Occurs onshore. Emplaced during the Early Mississippian Epoch - to - Mid Mississippian Epoch (Carboniferous Period) (359.3-330.3 Ma BP)."@en .