Abstract
Abstract. Strata of Aptian age in block 49 of the southern North Sea (U.K.) are reviewed in terms of lithostratigraphy, wireline log character and foraminiferal fauna. In some boreholes, the basal part of the Middle Holland Shale Member is interpreted as Late Aptian in age while the Lower Holland Marl Member is interpreted as Late to Early Aptian in age. The foraminiferal biostratigraphy of the Aptian strata in the designated reference borehole, 49/25-1, for the Dutch lithostratigraphical scheme in the U.K. southern North Sea is discussed briefly.
Highlights
This article discusses the recognition of Aptian age strata in the southern North Sea Basin in terms of lithostratigraphy and foraminiferal biostratigraphy
BIOSTRATIGRAPHY Aptian age dating by means of foraminifera is hindered by a number of factors
The stratigraphic subdivision of the Aptian strata onshore is based on the study of the microfaunal, macrofaunal and lithological sequences encountered
Summary
This article discusses the recognition of Aptian age strata in the southern North Sea Basin in terms of lithostratigraphy and foraminiferal biostratigraphy. The Aptian to Early and Middle Albian age Sola Formation of Hesjedal & Hamar (1983) of the central Graben and Norwegian - Danish Basin of the North Sea would appear to be the time equivalent of the Middle Holland Shale Member and part of the Lower Holland Marl .Member. The unit termed the Lower Holland Marl Member in Vlieland Oost-1 may be the basal sand/ siltstone of the Middle Holland Shale Member and represent the product of the “basal Albian” transgression (note the double point spike of the sonic log). This hypothesis, has not been confirmed or refuted by microfaunal analysis (by the present author) of these two boreholes. BIOSTRATIGRAPHY Aptian age dating by means of foraminifera is hindered by a number of factors
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