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In page Tartessos:

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No pre-colonial necropolis sites have been identified. The change from a late Bronze Age pattern of circular or oval huts scattered on a village site to rectangular houses with dry-stone foundations and plastered wattle walls took place during the 7th and 6th centuries BC, in settlements with planned layouts that succeeded one another on the same site. At Cástulo (Jaén), a mosaic of river pebbles from the end of the 6th century BC is the earliest mosaic in Western Europe.[citation needed] Most sites were inexplicably abandoned in the 5th century BC.