Additional details on 'dugong' prehistoric ritual site Oregon caves yield evidence of continent's first inhabitants Ancient weapons factory unearthed in Leicestershire Iron Age burial mound found in the Netherlands Prehistoric burial ground discovered on Skye Novice metal detector man discovers treasure hoard in Scotland Chinese challenge to 'out of Africa' theory Father and son cleared of illegal treasure hunting in England Nazcas' destruction of forests caused downfall Expert uncovers celestial connection in desert US Southwest Possible Bronze Age burial site discovered in Oxford 11th Nordic Bronze Age Symposium Fallen standing stone found in Cornwall Mesolithic flint found by 11-year-old boy in England Bronze Age cattle travelled long distances