an ancient stone tool used as a hammer, as for chipping flint, processing food, or breaking up bones.
a stone used as a hammer in the production of tools during the Acheulian period
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A hand-held stone or cobble used by hominids perhaps as early as 2.5 million years ago as a crude pounding or pecking tool. Hammerstones were also used by early humans in striking flakes from stone cores to produce
The American Heritage® Science Dictionary
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All of the replicated artifacts were manufactured using one of two methods, antler or hammerstone.
The pits were also ideal for holding acorns or hickory nuts so that they could be cracked with a hammerstone.
He started by using a hammerstone to knock away many pieces called flakes from a second stone that would become the spear point.
Some slight pitting from hammerstone use is evident on the edge of the end opposite that with the facial abrasion.
Ends heavily pecked, indicating use as a hammerstone.