It had probably been washed from an exposure of clay deposits in an extinct tidal channel connected with the estuary of the ancient Humber.
It was dated by the AMS method of radioactive assay to between 1870-1670 BC, that is several centuries earlier than the age previously estimated for the Ferriby Boats at about 1300 BC.
I'm in the midst of packing up my apartment here in Brussels, ready to move back to Unoccupied Europe: five years behind enemy lines is enough.
All of which means I will be away from this blog for sometime.
Cool new paper by David Orton, in which he calibrates data for variable research intensity.