. "Hazel Greave Grit [Obsolete]"@en . "Obsolete name. Sandstone. Stratified bedrock. Occurs onshore. Deposited during the Marsdenian Substage (Carboniferous Period) (321.5-320 Ma BP)."@en . . . . "320.0"^^ . "HZG"@en . "[Obsolete]"@en . . . "archaic"@en . "321.5"^^ . "Hazel Greave Grit [Obsolete]"@en . .