Estuarine/Offshore Depositional Sequences of the Cretaceous Aptian-Albian Boundary, England
Published:January 01, 1999
Alastair Ruffell, Grant Wach, 1999. "Estuarine/Offshore Depositional Sequences of the Cretaceous Aptian-Albian Boundary, England", Mesozoic and Cenozoic Sequence Stratigraphy of European Basins, Pierre-Charles de Graciansky, Jan Hardenbol, Thierry Jacquin, Peter R. Vail
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In this work models are developed for the sequence stratigraphic interpretation of estuarine-shoreface-offshore reservoir sands found throughout Europe at the Aptian-Albian boundary. The models so developed are critically appraised through vertical facies analysis, facies distribution and paleogeographic reconstruction combined with correlation of depositional sequences. This process leads to the recognition of depositional sequences for which definitive criteria may vary, depending on paleogeographic and tectonic location. It is only after the effects of paleogeographic position are considered that an accurate account of sea-level history can be deduced in different environments. Arenaceous strata are present throughout southern England at the Aptian-Albian stage boundary (Lower Cretaceous); for example, the Sandrock/Folkestone Formation/Woburn Sands Formations occur both as part of a conformable succession in the Weald and Channel Basins and as an unconformable succession onlapping Jurassic and older strata of the basin margins. The facies and stratigraphy of three type successions are highly variable, suggesting environmental contrasts in Aptian-Albian times across southern England. Comparison of sequence stratigraphic analyses from each succession indicates that the depositional facies developed and preserved at sequence boundaries, as well as the number of sequence boundaries resolved, varies in direct response to the paleoenvironment.
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Mesozoic and Cenozoic Sequence Stratigraphy of European Basins
Mesozoic and Cenozoic Sequence Stratrigraphy of European Basins - This project was designed to build a documented chronostratigraphic and outcrop record of depositional sequences calibrated across European Basins. Data on standard stages, magnetostratigraphy, and geochronology integrated with high resolution biostratigraphy calibrate the stratigraphic position of depositional sequence boundaries. Higher order eustatic sequences show a significant increase in the number identified. A good portion of the European Mesozoic and Cenozoic succession is set in a sequence stratigraphic context with a better stratigraphic record of its bonding surfaces.