. "Conformably overlies the mudstones of the Caerfai Bay Shales Formation."@en . . . "Micaceous sandstone with subsidiary feldspathic-arenite and pebbly (gravelly) sandstone and trace mudstone. Stratified bedrock. Occurs onshore. Deposited during the Comley Series - to - St David's Series (Cambrian Period) (526-499 Ma BP)."@en . "CRBS"@en . "Overlain by greenish grey sandstones of the Solva Group. The boundary was considered to be sharp and unconformable by Jones (1940) but Stead and Williams (1971) considered it to be conformable and transitional."@en . "To 150m"@en . "499.0"^^ . "Fine-grained purple micaceous and feldspathic sandstones, pebbly near the top, with thin mudstone interbeds."@en . "Caerbwdy Sandstone Formation"@en . "Caerbwdy Sandstone Formation"@en . . "526.0"^^ . "stable"@en . . .