"GHC"@en . . "Gibbet Hill Conglomerate [Obsolete: use GHC]"@en . "298.9"^^ . . . . "Gibbet Hill Conglomerate Bed"@en . "274.4"^^ . "Conglomerate. Stratified bedrock. Occurs onshore. Deposited during the Cisuralian Epoch (Permian Period) (298.9-274.4 Ma BP)."@en . . . . "stable"@en . . "Conglomerate."@en . . "Gibbet Hill Conglomerate Bed"@en .