Tranchet axes or, Thames Picks are typical of the Middle Stone Age, though this large example is said to be unique and is made of Chert, with its source being near Shaftesbury in Dorset. It was found in the Kennet Valley at a site named Wawcott I, one of about 50 sites identified by local archaeologist Roy Froom.
Further information about the archaeological site is available on the HER, https://www.heritagegateway.org.uk/Gateway/Results_Single.aspx?uid=MWB3860&resourceID=1030
HER – The Historic Environment Record (HER) is a register of all known archaeological and historical sites in the unitary authority of West Berkshire.
Period: c 10,000-4000 BC
Place: Kintbury
