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Quarterly Journal of the Geological Society; 1961; v. 117; issue.1-4; p. 363-366;
DOI: 10.1144/gsjgs.117.1.0363
© 1961 Journal of the Geological Society, London, Legacy

Discussion

Professor F. W. SHOTTON said that no one could doubt that there had been a complex succession of retreat phenomena, interrupted by glacial readvances. The author, however, would correlate all these oscillations with stages of glaciation commencing with the Irish Sea ice of the Mid-lands and therefore with stadia of the Last Glaciation. With this conclusion the speaker would agree, but it was certain also that the area must have been profoundly affected by the greater earlier glaciations of the Saale and Elster periods which pushed their ice so much farther south. He therefore asked if the author had found evidence, either erosional or depositional, of these earlier glaciations.

Mr. E. G. POOLE said that the paper contained much valuable material relating to the final retreat of the ice-sheets from the vicinity of the Alyn basin in North Wales, and was a natural extension of Dr. Embleton's recent work. He was, however, against the general acceptance of the author's conclusions regarding the sequence of glacial deposits and the Pleistocene chronology in the Wrexham area and adjacent regions of the Shropshire–Cheshire basin to the south-east.

Referring first to the glacial sequence in the vicinity of Llay and Wrexham, the speaker could find no support for the statement attributed to the authors of the Wrexham memoir (Wedd & others 1928) that the Wrexham Delta-terrace overlay the Upper Boulder-clay. On the contrary, wherever a section was given, the Upper Boulder-clay was shown by these workers to overlie the main deposits of the

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