PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Prehistoric axes of different materials. Four shaft-hole axes of a similar design but made in four different materials often used to define prehistoric ages. From left an antler axe, copper axe, bronze axe and stone axe. All these axes are presumed to date from between 3500 to 2000 BC and hence span the Neolithic and Bronze Age. The stone and antler axes may actually be the latest in date (approx 2000 BC) showing that use of a particular material cannot always be used to signify a particular date.
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