"330.3"^^ . . "330.9"^^ . . "Hurlet Limestone And Blackhall Limestone (Undifferentiated)"@en . . "Limestone."@en . . "Hurlet Limestone And Blackhall Limestone (Undifferentiated)"@en . "stable"@en . . . . . "Limestone. Bedrock. Occurs onshore. Formed during the Brigantian Substage (Carboniferous Period) (330.9-330.3 Ma BP)."@en . "HUBL"@en .