. "Huntley Quarry Beds"@en . "Stratified bedrock. Occurs onshore. Deposited during the Ordovician Period - to - Silurian Period (486.9-419 Ma BP)."@en . "486.9"^^ . . "Huntley Quarry Beds"@en . . . . "419.0"^^ . "stable"@en . "HQB"@en .