Jurassic stratigraphy of East Greenland

The East Greenland Rift Basin comprises a series of Jurassic subbasins with different crustal configurations, and somewhat tectonic histories styles. roughly N–S elongated basin is exposed in central northern over length more than 600 km width up to 250 km. southernmost exposures are found the largest subbasin Jameson Land, while northernmost on Store Koldewey Germania Land. focus present revision Jurassic, but uppermost Triassic lowermost Cretaceous successions included as they genetically related succession. whole succession forms an overall transgressive–regressive megacycle highest sea level maximum transgression Kimmeridgian. latest – Early was time quiescence Greenland. Lower deposits about 950 m thick restricted Land small down-faulted outlier Liverpool stratigraphic layer-cake package that records shift from Rhaetian–Sinemurian fluvio-lacustrine Pliensbachian early Bajocian mainly shallow marine sedimentation. Onset rifting late resulted complete reorganisation configuration drainage patterns, depositional expanded far towards north. Post-lower early-rift 500–600 Milne Traill Ø, Geographical Society Hold Hope, Clavering Wollaston Forland, Kuhn Th. Thomsen Hochstetter Upper rift-climax strata reach thicknesses several kilometres same areas exception In southern part basin, upper Kimmeridgian consists stepwise backstepping units starting sandstones ending relatively deep mudstones some places sandy gravity-flow injectites. Subbasins, (Volgian–Ryazanian) forestepping stacked shelf-margin sandstone bodies associated slope basinal mass-flow sandstones. North block-faulting tilting began culminated middle Volgian formation strongly tilted fault blocks, continued deepening. Forland Ø area, represented by wedge deep-water conglomerates pebbly passing basinwards into deposited fault-attached aprons coalescent submarine fans. lithostratigraphic scheme established 1970s 1980s here revised basis work undertaken subsequent years. entire succession, including (Rhaetian) (Ryazanian–Hauterivian), Supergroup. supergroup subdivided Kap Stewart, Neill Klinter, Vardekløft, Hall Bredning, Groups, which 25 formations 48 members. Many these revised, 3 new 14 members introduced.