English: Igneous stone hammer made from a beach cobble, ovoid in profile and sub-triangular in plan. The hammer stone has light impact pecking on the surface of the narrow, pointed end of the tool. This suggests that the tapered end was the striking surface and that the wider end was where it was gripped when used as a hand-held pounder. There are also various plough marks over both surfaces of the hammer.

   Similar examples can be found throughout Cornwall and are difficult to date, though they are mostly prehistoric.
 These tools have been referred to as pebble tools in the past and have been found on numerous Mesolithic sites, such as Poldowrian, on the Lizard, illustrated in CAJ No.21 (1982) on page 43-44, Figs.15-16, Nos.78-79.
 

Often these tools are re-used as whetstones, like an example from Trethellan Farm (CAJ No.30, 1991) illustrated on page 149, Fig.62, No.99, and dated to the Middle Bronze Age, c.1500-1200 BC.