Assertion: flint | /r/ObjectUse | used for example
Facets:
value: from antiquity
type: TEMPORAL
Source sentences:
text: Flint, knapped or unknapped, has been used from antiquity (for example at the Late Roman fort of Burgh Castle in Norfolk) up to the present day as a material for building stone walls, using lime mortar, and often combined with other available stone or brick rubble.