"23.04"^^ . . . "Dolerite. Igneous intrusive bedrock. Occurs onshore. Emplaced during the Paleogene Period (66-23.04 Ma BP)."@en . "stable"@en . . "Dolerite."@en . . "Butterton - Swynnerton Dykes"@en . . "BUSW"@en . "Butterton - Swynnerton Dykes"@en . "66.0"^^ . .