About: http://webisa.webdatacommons.org/409913853

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	They used stone or rock clues such as circles of stones or stones laid out in a pattern or individual stones sitting upright or with carvings or drill holes in them.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com