Archaeological observations of test pits and boreholes at the Tilbury Biosolids Dryer (TQ 66000 75700) revealed a sequence broadly similar to those previously recorded in the Thames floodplain. Two peat horizons were identified, one lying between 2 and 3m below ground level and one between 11 and 15m. the shallower of these is likely to be Bronze Age in date and so has the potential to reveal evidence of activity in the Thames Basin at that time.