Diccon Hart, the archaeologist who lead the excavation, says the wetlands next to the Thames were an important source of food in prehistoric times and that trackways made it easier for people to cross the terrains.

His team also found a piece of log with unusually well-preserved tool marks made by a metal axe (emphasis added).

So that's a 6000 year old metal axe then? Or was the wood already ancient when the trackway was made?

Hmm.
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simon