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Geological Society, London, Special Publications; 1990; v. 53; p. 329-347;
DOI: 10.1144/GSL.SP.1990.053.01.19
© 1990 Geological Society of London

Sedimentology and micropalaeontology of glacimarine sediments from the Central and Southwestern Celtic Sea

J. D. Scourse1, W. E. N. Austin1, R. M. Bateman2, J. A. Catt2, C. D. R. Evans3, J. E. Robinson4 & J. R. Young5

1 School of Ocean Sciences, University College of North Wales, Menai Bridge, Gwynedd, LL59 5EY, UK
2 Soils Department, AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Hertfordshire, AL5 2JQ, UK
3 British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK
4 Department of Geological Sciences, University College, Gower Street, London, WC1E 6BT, UK
5 British Museum (Natural History), Cromwell Road, London, SW7 5BD, UK

Thin discontinuous glacigenic sediments occur at or close to the sea bed as far south as 49°N in the Celtic Sea. The northern samples (facies A) are clast-rich, overconsolidated lodgement tills or proximal glacimarine sediments containing sparse reworked microfaunas. The southern samples (facies B) are distal glacimarine plastic silty clays containing abundant cold water microfaunas. Both these facies are correlated with the Late Devensian Scilly Till, enabling a quantitative reconstruction of ice thicknesses, grounding line, sea-level and shoreline elevations in the Celtic Sea at 19 000 years BP. The ice advance terminated in marine waters towards the shelf edge break, and is likely to have constituted a thin lobate surge over deformable marine sediments.