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...es: Silbury Hill|journal=British Archaeology|publisher=Council for British Archaeology|location=York, England|issue=70|issn=1357-4442|url=http://www.britarch.ac.u ...=Silbury is safe|journal=British Archaeology|publisher=Council for British Archaeology|location=York, England|issue=101|pages=8|issn=1357-4442}}</ref>

.... c.3800&nbsp;BC to 3650&nbsp;BC even though some [[Badarian]] [[Artifact (archaeology)|artifacts]] may in fact date earlier (for example, see [[Badarian]]). Neve ...arch Association}}</ref> are in fact the earliest [[Artifact (archaeology)|artifact]]s of [[iron]] known<ref>{{cite web|url=http://www.britannica.com/eb/articl