noun Archaeology.
an ancient stone tool used as a hammer, as for chipping flint, processing food, or breaking up bones.
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World English Dictionary
hammerstone (ˈhæməˌstəʊn)
a stone used as a hammer in the production of tools during the Acheulian period

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hammerstone   (hām'ər-stōn')  Pronunciation Key 
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 core tools.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
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.
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