Dr. R. G. West said that the paper brought forward two main points; first, the glacial sequence of East Anglia and the reality of the Gipping Till and secondly, the correlation of this sequence with that of the continent. These two issues should be considered separately. Taking the definition that a cold stage in the Pleistocene is characterized by the presence of glacial deposits, periglacial deposits or a cold fauna or flora, and a temperate stage (interglacial) by evidence for temperate conditions, then there is evidence in East Anglia for a cold stage between the Hoxnian and Ipswichian interglacials, in the form of periglacial floras above the Hoxnian and late-glacial floras below the Ipswichian. The simplest interpretation of these observations is that there was a single cold stage between the Hoxnian and Ipswichian. There might be more. To this cold stage have been ascribed tills (Gipping Till) and fluvioglacial gravels of north Norfolk. The authors must be right in saying that the widespread chalky boulder clay of Norfolk and Suffolk was pre-Hoxnian. The problem was of the extent of a post-Hoxnian till. It appeared that there was no evidence for a widespread occurrence of post-Hoxnian till. Perhaps some tills in the Breckland might belong here. The conclusion was that it yet remained to be shown what the extent of glaciation was in the post-Hoxnian cold stage. It seemed probable to the speaker that while, as Dr. Bristow and Dr. Cox point out, there is little evidence for a widespread till

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.