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Journal of the Geological Society; 1991; v. 148; issue.3; p. 473-484;
DOI: 10.1144/gsjgs.148.3.0473
© 1991 Geological Society of London

Article

A revised model for the Pleistocene development of the River Avon, Warwickshire

D. MADDY1, D. H. KEEN2, D. R. BRIDGLAND3 & C. P. GREEN1

1 Centre for Quaternary Research, Department of Geography, RHBNC, University of London, Egham, SurreyTW20 0EX, UK
2 Department of Geography, Coventry Polytechnic, Coventry CV1 5FB, UK
3 Nature Conservancy Council, Northminster House, Peterborough PE1 1UA, UK

A re-examination of the Pleistocene river deposits in the valley of the Midland Avon indicates that the conventional post-Hoxnian model for their development has to be revised. Reinvestigation of two key localities, Cropthorne in the Lower Avon valley and Ailstone on the Warwickshire Stour, a left bank tributary of the Avon, shows that the deposits of at least two separate temperate episodes are represented within the sequence. Amino-acid ratios on non-marine Mollusca from the temperate deposits allow these episodes to be correlated with oxygen isotope stages 5 and 7. Since the stage 7 temperate deposit lies within sediments which post-date the Wolston glacial sequence. an older age is indicated for that sequence than is proposed in the conventional stratigraphic succession of the British Pleistocene.




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