Abstract
The late Triassic-early Jurassic Vinding and Gassum Formations are redefined and mapped within the Norwegian-Danish Basin. The Vinding Formation is a brackish marine shallow water deposit restricted to the Danish Subbasin. It is of late Norian-Rhaetian age. The Gassum Formation is a fluvio-deltaic to near-shore marine, arenaceous deposit carried from north and east into the basin. Its upper part is diachronous, ranging in age from Rhaetian in the basin center to late Sinemurian in the northern margin. It is proposed that the Ullerslev Formation is repealed. The parallelism between the course of sedimentation in the Norwegian-Danish Basin, the North German Basin and the Polish Basin indicates eustatic sea level changes to be of greater importance than local tectonic events.
Highlights
The onshore drilling activity for hydrocarbons m Denmark has for many years been concentrated on Mesozoic sandstone reservoirs and/or Zechstein carbonates
Among the main objectives have been the Rhaetic sandstones, named the Gassum Formation by Larsen (1966), of the Danish Subbasin, which forms the eastern part of the Norwegian-Danish Basin
Michelsen, who has described the Lower Jurassic litho- and biostratigraphy of the Norwegian-Danish Basin in several publications (1973, 1975, 1978 a.o.), demonstrated the diachronous nature of the Gassum Formation; that is, he showed the upper part of the formation in the most northerly wells in Jutland to range into or through the Sinemurian, whereas the top part in the centre of the basin is Rhaetian to early Hettangian in age
Summary
Serie B, Nr. 3 Geological Survey ofDenmark. 3 er sat med Foto Times og trykt i offset i 1000 eksemplarer hos C. Bogen er trykt pa Thai-Cote, 115 g fra A/S De Forenede Papirfabrikker.
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