"200m (maximum)"@en . . . "Pebbly volcaniclastic-sandstone and volcaniclastic-breccia with subsidiary volcaniclastic-sandstone. Stratified bedrock. Occurs onshore. Deposited during the Caradoc Series (Ordovician Period) (458.2-449.75 Ma BP)."@en . "Blake Brow Breccia Member"@en . . . "stable"@en . "Blake Brow Member [Obsolete: use BLBR]"@en . "458.2"^^ . . . . . . "Volcaniclastic breccia and pebbly volcaniclastic sandstone with some intercalated volcaniclastic sandstone."@en . "449.75"^^ . "Blake Brow Breccia Member"@en . "BLBR"@en . "Base of lowest thick unit (c.75m) of breccia and/or pebbly sandstone, resting with probable conformity on sandstone of the Deepdale Sandstone Formation."@en . "Top of highest thick (c.20 - 30m) unit of breccia and/or pebbly sandstone, overlain by sandstone of the Deepdale Sandstone Formation."@en .