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Ancestral Thames
The Ancestral Thames is the name given to the geologically ancient precursor to the present day River Thames.
==Relationships with other rivers==
In central and southern Britain, during the Early and Middle Pleistocene were two main rivers of more than the Bytham and the Ancestral Thames. For most of Early Pleistocene the latter was the main river with, at its maximum extent, a catchment area that extended into Wales, alongside the Chiltern Hills, through southern East Anglia and finally lowlands in what is now the North Sea, to join the ancestral Rhine. In detail, for instance in this early Ice Age the Thames flowed along a line similar to the River Thame, then through parts of Bedfordshire and Hertfordshire to the north of Greater London, through north-west Essex and took a course resembling that of the River Waveney on the Suffolk/Norfolk border. Initially the more northern Bytham River was a tributary of the Thames but as temperatures overall warmed it progressively extended its catchment. During the Anglian Stage the Bytham river more or less disappeared and the Thames was diverted to its present route through London.
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