Abstract
Drilling and detailed mapping of three tunnel-valleys in Norfolk have revealed the presence of a more complex evolutionary history than hitherto supposed. These new investigations indicate several phases of channelling within individual tunnel-valleys. Deposits of the Hoxnian and Ipswichian interglacials are shown to occupy deep channels and hollows which were formed below present sea level during post-Anglian times. The majority of channelling and depositional episodes relate to non-glacigenic fluvial activity and glacial or meltwater processes have played only a subsidiary role in modifying these long-lived drainage networks. Doubt is thus case on the view that many of the buried tunnel-valleys of Norfolk result primarily from Anglian subglacial meltwater erosion.
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