"stable"@en . "Dogger Formation"@en . "170.9"^^ . . . "Across most of the Cleveland Basin, the lower boundary is generally sharp, disconformable or unconformable on the gently folded Lower Jurassic Lias Group, marked by an abrupt change where grey fissile mudstone of the Lower Jurassic Whitby Mudstone Formation is overlain by sandstone, ironstone or limestone of the Dogger Formation. The boundary is less distinctive in the Peak Trough (Knox, 1984) (e.g. exposed at Blea Wyke; Ravenscar) [NZ 991 015] where the bioturbated sandstone of the Blea Wyke Sandstone Formation (late Toarcian in age) is overlain by the yellow brown sandstone of the Dogger Formation (Aalenian in age), although at Blea Wyke the basal bed contains phosphate pebbles and casts of brachiopods (the Terebratula Bed) (Cox and Sumbler, 2002, pp. 357-361). In the Rosedale area, the base of the formation is generally marked by an ooidal ironstone with phosphatic pebbles sharply overlying bioturbated sandstone or ooidal ironstone of the Blea Wyke Sandstone Formation (Young, 1994), although in localities where these lithologies repeat, the boundary may be difficult to place."@en . "Ferruginous sandstone with subsidiary ooid-limestone, shelly ironstone, shelly limestone and silty mudstone and trace ironstone and ooid-ironstone. Stratified bedrock. Occurs both onshore and offshore. Deposited during the Aalenian Age (Jurassic Period) (174.7-170.9 Ma BP)."@en . "Wroot Formation"@en . . . . . . . . "Highly variable and heterolithic with substantial lateral interdigitation and lithofacies changes. In the Whitby area and coastal sections to the southeast, the formation consists mainly of grey, weathering yellow-brown, sideritic sandstone, medium- to coarse-grained, with sporadic phosphatic pebbles; berthierine (chamosite) ooids may be present. In central, north and west Cleveland there is a complex interdigitation between grey, weathering yellow-brown, berthierine (chamosite) ooidal ironstone (with siderite mudstone matrix) and pale grey limestone, medium-grained, bioclastic wackestone and packstone with peloids and ooids, generally bioturbated and locally cross-bedded. In addition, partings, lenses and beds of grey, fossiliferous fissile mudstone may occur, and south-west of Malton, a distinctive iron-rich pebbly medium-grained sandstone facies is locally developed. Sandstones and ironstones are characteristically highly bioturbated and yield marine fossils including bivalves and scattered ammonites; corals, bryozoans, crinoids and brachiopods are locally present in the limestones."@en . "Variable, both locally and regionally; generally about 0.75 to 2m thick on the Yorkshire Coast and in ferruginous sandstone/ironstone lithofacies; limestone and mudstone lithofacies, up to 12.2m locally preserved. Thought locally to attain 29 m in the Rosedale area [SE 729 946] (Hemingway, 1974, p. 188), although Young (1994) regards much of this strata as belonging to the underlying Blea Wyke Sandstone Formation in which case the Dogger Formation here is up to about 8 m thick. May be absent, locally, due to erosion prior to deposition of the overlying Saltwick Formation (Ravenscar Group)."@en . "Dogger Formation"@en . "Dogger [Obsolete: use NS, DGR]"@en . "Dogger Ironstone [Obsolete: use DGR]"@en . "The upper boundary is unconformable or disconformable, sharp. Marked by an abrupt upward transition from ferruginous sandstone, ironstone or limestone at the top of the Dogger Formation to cross-stratified, non-bioturbated sandstone, siltstone and mudstone (commonly with plant fragments) of the overlying Saltwick Formation (Ravenscar Group). Where both formations are dominated by mudstone, the boundary may be somewhat cryptic - that of the Dogger Formation is dark grey, less silty and of a distinctly marine aspect, that of the Saltwick Formation is paler grey, silty and with black plant debris."@en . . "DGR"@en . "The upper boundary is unconformable or disconformable, sharp. Marked by an abrupt upward transition from ferruginous sandstone, ironstone or limestone at the top of the Dogger Formation to cross-stratified, non-bioturbated sandstone, siltstone and mudstone (commonly with plant fragments) of the overlying Saltwick Formation (Ravenscar Group). Where both formations are dominated by mudstone, the boundary may be somewhat cryptic – that of the Dogger Formation is dark grey, less silty and of a distinctly marine aspect, that of the Saltwick Formation is paler grey, silty and with black plant debris."@en . "174.7"^^ .