"HND"@en . . . "Horton Neptunian Dyke"@en . . "448.75"^^ . . "Bedrock. Occurs onshore. Formed during the Cautleyan Stage (Ordovician Period) (449.25-448.75 Ma BP)."@en . "Horton Neptunian Dyke"@en . . . . . "stable"@en . "449.25"^^ .