Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Khami Ruins National Monument' has mentioned 'Stone Age' in the following places:
Occurrence Sentence Text Source
It is composed of a complex series of platforms of dry-stone walled structures, emulating a later development of Stone Age culture.
Criterion (iii): The property is a unique and exceptional testimony to a civilization which has disappeared.The architecture and archaeological artefacts of the site provide important scientific and historical evidence critical for the understanding of the full chronological development of the Zimbabwe tradition from the Stone Age to the Iron Age era.