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The ancient northern Thames is an explanation for the Colne Valley,
the river Colne being the western boundary of Middlesex with Berkshire and Buckinghamshire.It's readily apparent that the current Colne could not possibly have carved that wide valley,
separating Harefield from the Chilterns, and left the prodigious quantities of gravels,
now evident from the lakes in former gravel pits.
mespilus
el_presidente
@Oliver Schick
on Monday our tunnelling specialist gave us a lecture about the river Thames, the tyburn delta around Westminster Abbey (Thorney Island), evolution of terracing North and South of the river that forms our Valley, history of our main river before it flowed through modem day London with vast lakes around Windsor, prehistoric hippo bones and teeth, that the old thames was once a tributary north of the Chilterns to the mighty Rhine that joined beyond East Anglia above the land bridge connection to the continent .
Finally our engineers gave us an insight to their intervention to protect Elizabeth tower, bridge street and Westminster bridge during the construction of the jubilee line extension. I think you would have enjoyed it.
When you look back as far as nine ice ages, our 150 year look ahead seems a mere blink..