"Marked or gradational downward change from silty mudstones to smoother argillaceous sediments of the Charmouth Mudstone Formation; commonly coincides with negative change of slope and/or line of seepage that may correspond with a sandy bed (e.g. Capricornus Sandstone in the Cotswolds; Sumbler, M G, Barron, A J M and Morigi, A N, 2000). On Dorset coast, at base of Three Tiers Sandstone (Hesselbo, S P and Jenkyns, H C, 1995) (base of Bed 6 of Howarth, M K, 1957)."@en . . . . . . . . . . "Dyrham Silt(s) [Obsolete: use DYS]"@en . . . "To c.125m"@en . . "Middle Lias Clays [Obsolete: use DYS]"@en . "Middle Lias Sandy Beds [Obsolete: use DYS]"@en . "Dyrham Formation"@en . . "184.2"^^ . . . . "DYS"@en . "Middle Lias Sands and Silts [Obsolete: use DYS]"@en . "Middle Lias Silts and Clays [Obsolete: use DYS]"@en . "Gonerby Member [Obsolete: use DYS]"@en . "Middle Lias Silts [Obsolete: use DYS]"@en . "Sandy mudstone and silty mudstone with subsidiary limestone, ooid-ironstone, sand, sandstone and siltstone and trace mudstone. Stratified bedrock. Occurs both onshore and offshore. Deposited during the Pliensbachian Age (Jurassic Period) (192.9-184.2 Ma BP)."@en . . . "Pennard Sand Member [Obsolete: use DYS]"@en . "Middle Lias [Obsolete: use DYS]"@en . "Dyrham Formation"@en . "Pale to dark grey and greenish grey, silty and sandy mudstone, with interbeds of silt or very fine-grained sand (locally muddy or silty), weathering yellow. Variably micaceous. Impersistent beds or doggers of ferruginous limestone (some ooidal) and sandstone, which tend to occur at the top of sedimentary cycles. Sporadic large cementstone nodules."@en . . "Dyrham Siltstone Formation [Obsolete: use DYS]"@en . "At base of ferruginous limestone or ironstone of the Marlstone Rock Formation or Marlstone Member of the Beacon Limestone Formation."@en . . . "192.9"^^ . . "stable"@en .