. . . . "stable"@en . . "Oilshale. Stratified bedrock. Occurs offshore. Deposited during the Kimmeridgian Age (Jurassic Period) (154.8-149.2 Ma BP)."@en . "BLST"@en . "Sharp transition to mudstone (sometimes calcareous) of the Kimmeridge Clay Formation."@en . . "Blackstone Bed (Jurassic)"@en . "0.6 m."@en . "149.2"^^ . "154.8"^^ . "Sharp transition between the Blackstone oil shale and overlying mudstone of the Kimmeridge Clay Formation."@en . "Massive oil shale with calcareous and pyritic concretions and pyritized Saccocoma."@en . . . "Blackstone Bed (Jurassic)"@en .