"Ashprington Volcanic Formation"@en . . "Basalt lava with subsidiary basaltic tuff. Stratified bedrock. Occurs onshore. Deposited during the Eifelian Age - to - Frasnian Age (Devonian Period) (394.3-371.1 Ma BP)."@en . . . . "Ashprington Volcanic Series [Obsolete: use AVS]"@en . "AVS"@en . . . . "394.3"^^ . "Ashprington Volcanic Formation"@en . "Basalt lava with subsidiary basaltic tuff."@en . . "stable"@en . "371.1"^^ .