Assertion: prehistoric human | /r/CapableOf | use hammerstone
Facets:
value: to break nuts
type: PURPOSE
value: to break seeds
type: PURPOSE
value: to chip other stones
type: PURPOSE
Source sentences:
text: Prehistoric humans used hammerstones to chip other stones into sharp-edged flakes.
text: They also used hammerstones to break apart nuts, seeds and bones and to grind clay into pigment.