Abstract
The Cotton Diamicton, the lower diamicton unit of the Anglian-age North Sea Drift Formation is investigated at two coastal localities in East Anglia — Trimingham and Cotton. At Trimingham, the diamicton was deposited subglacially by Scandinavian ice which entered the region of north Norfolk from the northeast. The deposit consists of a three-tiered till assemblage characteristic of constructional glaciotectonic deformation: a lower tectonite consisting of deformed local preglacial sands; a middle till deformed by brittle shear; and an upper massive till deformed by ductile deformation. At Cotton, the diamicton was deposited as part of a prograding grounding line fan which formed as a point-source depocentre adjacent to the temporary, subaqueous grounded margin of the Scandinavian ice sheet. The study contributes to an understanding of early Anglian palaeogeography by demonstrating the influence of grounded ice on drainage within the Bytham catchment, and the development of an extensive proglacial lake basin within the region.
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