"c.100m"@en . "Grain Burn Member"@en . . . . "Grain Burn Member"@en . . . "458.2"^^ . "Conformable base of lavas on pyroclastic rocks within Peat Rig Formation along Grain Burn."@en . "stable"@en . "449.75"^^ . . "Porphyritic lavas of hawaiite/mugearite composition."@en . "GRAB"@en . . . "Conformable top of lavas below pyroclastic rocks within Peat Rig Formation along Grain Burn."@en . "Lava and trachyandesite with subsidiary volcaniclastic-breccia. Stratified bedrock. Occurs onshore. Deposited during the Caradoc Series (Ordovician Period) (458.2-449.75 Ma BP)."@en .