The Westland Green Gravels, thought to be the oldest surviving deposits of the Thames, have hitherto been traced eastwards no further than Bishop's Stortford. It is now believed that they can be traced into central Suffolk and perhaps as far as the Norwich area, being represented in Essex and Suffolk by a part of the Kesgrave Formation of Rose & Allen (1977), and in Norfolk by a part of the Norwich Crag Series of Woodward (1881). There is evidence that all these deposits were laid down in braided streams flowing north-eastwards, under periglacial conditions. They are tentatively correlated on lithological grounds with a marine conglomerate on the Norfolk coast, itself assigned by West (1980) to a newly recognised post-Baventian pre-Pastonian cold interval. There are some indications that a large left-bank tributary entered the main river in north-central Suffolk, and it is suggested that both rivers may have originated as glacial outwash streams. © 1980, The Geologists' Association. All rights reserved.
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