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Geological Society, London, Special Publications; 1992; v. 61; p. 149-167;
DOI: 10.1144/GSL.SP.1992.061.01.09
© 1992 Geological Society of London

A discussion of alluvial sandstone body characteristics related to variations in marine influence, Middle Jurassic of the Cleveland Basin, UK, and the implications for analogous Brent Group strata in the North Sea Basin

Jan Alexander

Geology Department, University of Wales College of Cardiff, PO Box 914, Cardiff CF1 3YE, UK

The pattern of deposition in the Middle Jurassic Cleveland and North Sea basins was complicated by spatial and temporal variations in the amount of marine influence. These variations ranged from major changes in shore-line position resulting in the alternating deposition of marine and non-marine formations to minor shore-line movements, incursions, tidal back-up, saline wedge intrusion and storm/tide/rain-induced flood events. The fluctuating extent of marine influence resulted from the interplay of factors including sedimentation rate, compaction, local tectonic activity and eustatic variations. The extent of marine influence on the alluvial environment affected the nature and architecture of sandstone bodies and the nature of early diagenesis.

It is probable that within the North Sea area local and regional relative sea-level fluctuations during Ness Formation deposition would have resulted in a range of alluvial sandstone body types similar to those of the Middle Jurassic of Yorkshire seen in outcrop. Major changes in sea-level relative to surface subsidence resulted in changing sandstone body architectural styles, while minor changes in marine influence resulted in significant changes in internal sandstone body characteristics.





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J. Alexander and R. L. Gawthorpe
The complex nature of a Jurassic multistorey, alluvial sandstone body, Whitby, North Yorkshire
Geological Society, London, Special Publications, 1993; 73: 123 - 142.
[Abstract] [PDF]