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Late Weichselian Potholes Near Wolverhampton, England

  • Alan V. Morgan (a1)

Abstract

Three potholes and a narrow channel cut into bedrock in a side-hill position were observed beneath an Irish Sea till west of Wolverhampton, England. The potholes and the channel are believed to have been cut by subglacial or latero-glacial streams flowing beneath or immediately beside the Irish Sea ice sheet. They were later choked by sand and gravel from this ice sheet and capped by till which ended the glaciofluvial deposition. Deposits below and above the till have been 14C dated at 30 655 and 13 490 years B.P. at localities between 13 and 27 km north of the trench section described.

Résumé

Trois moulins de glacier et un chenal étroit creusé dans le socle rocheux sur le côté d'une colline ont été observés sous la couverture morainique de la mer d'Irlande à l'ouest de Wolverhampton, Angleterre. Les moulins et le chenal sont supposés avoir été creusés par des fleuves sous-glaciaires ou latéraux s'écoulant sous ou immédiatement près des dépôts glaciofluviaux de la glace de la mer d'Irlande. Plus tard ils ont été frappés par du sable et du gravier de cette nappe de glace et surmontés par des dépôts glaciaires qui finissaient les dépôts fluvioglaciaires. Les dépens dessous et dessus ces débris glaciaires ont été datés par 14C à 30 655 et 13 490 années en des sites entre 13 et 27 km au nord de la section décrite.

Zusammenfassung

Drei Gletschertöpfe und ein enger Kanal, eingeschnitten in den Felsgrund an einer Hangseite, wurden unter einer diluvialen Ablagerung an der Irischen See westlich von Wolverhampton, England, gefunden. Es wird vermutet, dass die Gletschertöpfe und der Kanal durch subglaziale oder randliche Schmelzwasserströme des Eislobus der Irischen See eingeschnitten wurden. Sie wurden später von Sand und Schutt aus diesem Eislobus zugefüllt und durch eine Schotterbank überdeckt, womit die glaziofluviatile Ablagerung beendet wurde. Ablagerungen unter und über der Bank an Orten, die zwischen 13 und 27 km nördlich der beschriebenen Grabenzone liegen, wurden mit 14C auf 30 655 bis 13 490 Jahre vor der Gegenwart datiert.

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Copyright

References

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