The early Quaternary North Sea Basin

The onset of the Quaternary (2.58 Ma) corresponds to significant palaeo-environmental events, such as the intensification and southward extension of northern hemisphere glaciation. In the North Sea Basin a significant late Cenozoic succession has been identified as a high-resolution archive of palaeo-environmental changes during the Pliocene and Pleistocene. However the identification of the base of the Quaternary has been a long-standing issue due to lack of stratigraphic calibration. This study incorporates continuous, regional 3D seismic data with high-quality chronostratigraphic markers to map the base-Quaternary surface at high resolution across the entire North Sea. Depth conversion, backstripping, seismic geomorphology and sedimentation rate calculations are integrated to analyse the palaeo-geographic evolution of the North Sea Basin and its infill of c 83x10³ km³ of northward prograding marine to deltaic sediments. The basin is 600 km long from SSE to NNW and largely localised above residual topography of the Mesozoic graben system. During the earliest Quaternary (2.58 to 2.35 Ma) palaeo-water depths were c. 300±50 m and solid sedimentation rates (calculated from 0% porosity) c.32 km³ ka^-1. The base-Quaternary provides an important marker for further studies of the changing environment of the Quaternary of NW Europe as well as resource and shallow geohazard analysis.