Abstract
Analysis of samples of clays from the Pleistocene Norwich Crag Formation near Southwold in eastern Suffolk, England has revealed the presence of relatively abundant reworked palynomorphs derived from Carboniferous, Jurassic, Cretaceous and Palaeogene strata. A further sample of similar age from a borehole at Sudbourne, near Ipswich, contains additional evidence for the reworking of Silurian sediments. The presence of the derived palynomorphs is consistent with input from rivers flowing eastwards into the western margin of the Crag depositional basin during the Baventian. The input in the Southwold area was via the forerunner of the Byfham River, a river which flowed from the English Midlands to the East Anglian coast prior to the onset of the Anglian glaciation. The proto-Thames is argued as the transporting medium for the Silurian palynomorphs in the Sudbourne sample.
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