1. The Red Crag and Norwich Crag formations in eastern Suffolk
- Author
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D.H. Jeffery, B.S.P. Moorlock, S.J. Booth, A.N. Morigi, and Richard J.O. Hamblin
- Subjects
geography ,geography.geographical_feature_category ,Paleontology ,Intertidal zone ,Shoal ,Geology ,Estuary ,Bramertonian Stage ,Archaeology ,Cretaceous ,Stage (stratigraphy) ,River mouth ,Marine transgression - Abstract
The Red Crag Formation of eastern Suffolk was deposited in structurally controlled basins during the Pre-Ludhamian, Ludhamian and Thurnian stages. A regression during the Thurnian was followed by a transgression during the Antian/Bramertonian Stage, with the Norwich Crag Formation resting unconformably on strata as old as Upper Cretaceous. A regression during the Baventian Stage led to the formation of a complex of shoreface gravels (Westleton Beds) and intertidal clays at the mouth of a river which flowed from the English Midlands to reach the sea in the Southwold area. The Chillesford Clay Member was formed penecontemporaneously at the estuary of the proto-Thames, further south. A further marine transgression occurred during the Pastonian. The Pre-Ludhamian, Antian/Bramertonian and Pastonian transgressions are tentatively correlated with the reflectors respectively at the base of the Westkapelle Ground, Smith's Knoll and Winterton Shoal formations of the southern North Sea.
- Published
- 1997
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