Cenozoic excl. Danian limestone
During the Quaternary and Tertiary a regional subsidence took place resulting in a large depositional basin, the axis of which coincides with the central part of the present North Sea. Thick Tertiary and Quaternary series were deposited, consisting mainly of clays with an increasing amount of sand upwards. The upper part of the series is particularly uninfluenced by deeply seated structures or by major tectonic activities (fig. 36).
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