. . "Stratified bedrock. Occurs onshore. Deposited during the Frasnian Age - to - Famennian Age (Devonian Period) (378.9-359.3 Ma BP)."@en . "Gupton Formation"@en . . "The formation comprises two coarsening-upwards sequences of red mudstones passing up into clean, well-sorted sandstones. \r\n\r\nThe lower sequence (the Lower Sandstone Member) consists of thick, lenticular and tabular sandstones and pebbly sandstones which coarsen and thicken upwards. It shows an upward change from thin multistorey sandstones in a background of red mudstones and siltstones to thicker single-storey sandstones and eventually into stacked, pebbly sandstone-based fining-upwards units. It is only present in the southernmost outcrops at Freshwater West, where it is 55 m thick and crops out in the cliffs and foreshore [SR 8876 9885]. \r\n\r\nThe upper sequence (the Stackpole Sandstone Member) comprises a lower mudstone-rich heterolithic facies association and an upper trough cross-bedded and parallel-laminated sandstone association. It ranges from 6 m in thickness in the north near the Ritec Fault to 68 m in the south."@en . "The upper boundary is disconformable in northern exposures, where an erosion surface at the top of the formation is cut in texturally mature trough-cross-bedded and parallel laminated sublitharenites and is overlain by immature pebbly red lithic sandstones and conglomerates rich in volcanic debris and calcrete-rich mudstones that form the base of the West Angle Formation. In the south, there is a transitional upper boundary, with interdigitation of the mature and immature facies."@en . . "Gupton Formation"@en . . "The lower boundary overlies the regional Acadian unconformity. The formation rests unconformably on the underlying Lower Devonian Ridgeway Conglomerate Formation, overstepping it eastwards to lie on the Milford Haven Subgroup. The Lower Sandstone Member is unconformably overlain by the Stackpole Sandstone Member. The latter oversteps both the Lower Sandstone Member and the Ridgeway Conglomerate Formation to extend eastwards across the entire Pembroke Peninsula, resting directly on the Freshwater West Formation in the east, as for example on Caldey Island."@en . . "From 61 m to 123 m."@en . . "Mudstone and sandstone. Stratified bedrock. Occurs onshore. Deposited during the Famennian Age (Devonian Period) (371.1-359.3 Ma BP)."@en . "359.3"^^ . "378.9"^^ . "stable"@en . "GUP"@en . . "371.1"^^ . .