Detailed stratigraphic subdivision and regional correlation of the southern Danish Triassic succession

Abstract

This paper provides a regional, log-based lithostratigraphic correlation of the Danish Triassic deposits with deposits known from the southern North Sea Basin, including the northwest German and Dutch onshore areas. A new lithostratigraphic nomenclature, mainly adapted from the Dutch nomenclature, is suggested for the Danish area south of the Ringkøbing-Fyn High, replacing the previously used nomenclature. The new nomenclature comprises the Lower Triassic Bunter Shale and Bunter Sandstone Formations, the Lower to Middle Triassic Röt and Muschelkalk Formations, and the uppermost Middle Triassic and Upper Triassic Keuper and Sleen Formations. In total, 22 members are also defined from the southern North Sea into the southern Danish area. This main marine southern facies province is separated from a continental northern facies province by the northern flank of the Ringkøbing-Fyn High trend. Units of the southern province only crossed the central and western part of the Ringkøbing-Fyn High during the Röt and the Muschelkalk transgressions, whereas the basin north of the eastern part of the high was influenced by the southern facies province during the Early to early Late Triassic.