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(Article of periodic en Anglais - 1979)

Document title

The geomorphological significance of the Wolstonian glaciation of eastern England

Authors(s) and Affiliation(s)

STRAW A. ;

Abstract

The Wolstonian Glaciation is a somewhat controversial event in the glacial history of eastern England, particularly in Norfolk. Facies changes in the older tills of Lincolnshire, consistent with the north-south outcrops of Jurassic and Cretaceous rocks on which they rest, betray ice movement from the north, a direction also to be inferred from the tills of central and west Norfolk. These tills are overlain by Ipswichian or later materials, and at two localities pre-Devensian tills are underlain by deposits incorporating fossils of supposed Hoxnian character. In East Anglia the Wolstonian limit is considered to lie broadly from Aylsham by Norwich toward Diss and Bury St Edmunds, east Norfolk and Suffolk remaining unglacierized. Wolstonian drifts collectively form a convenient datum by which landforms may be judged older or younger. Thus although erosion by Wolstonian ice created new surfaces in central Lincolnshire, the Fen basin, and the Vale of Belvoir, and probably breached a former drainage divide near Gainsborough, elsewhere either little-modified land surfaces are buried by drifts or younger landforms have developed after drift deposition. In other areas, the glacial impact appears minimal, and pre-Wolstonian landforms survive as part of the present land surface. The land surface of the Vale of Belvoir and surrounding areas contains just such a variety of features, and the Bain valley in the western Lincolnshire Wolds provides a measure of post-Wolstonian "fluvial" erosion at the mean rate of about 3-3tonnes/hectare/year.

Source

Article of periodic

published at : Institute of British geographers transactions London

Editor :

Millesime : 1979, vol. 4, no4 [pp. 540-549]

Bibliographic references : 23réf.

Language

Anglais

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