. "541.0"^^ . "c.625m"@en . . . "Blackbrook Reservoir Formation"@en . "Volcaniclastic-mudstone and volcaniclastic-siltstone with subsidiary volcaniclastic-sandstone and trace breccia and volcaniclastic-breccia. Stratified bedrock. Occurs onshore. Deposited during the Ediacaran Period (Precambrian) (635-541 Ma BP)."@en . "stable"@en . . "Green to grey, graded volcaniclastic mudstones, siltstones and sandstones with massive beds of volcaniclastic sandstone and breccia."@en . "635.0"^^ . . "Sharp contact with South Quarry Breccia Member of the Ives Head Formation."@en . . "Sharply overlain by Benscliffe Breccia Member, of the Beacon Hill Tuff Formation."@en . "Blackbrook Reservoir Formation"@en . "BLK"@en . . .