Chalcolithic
The Chalcolithic (Copper and Stone) period, also known as Eneolithic or Copper Age, lasts in the Basque Country from c. 2500 to c. 1700 BC.
Basques then inhabited in caves and open air sites, being these more common in the South. There was an evident deographic increase in this period, starting already at the end of Neolithic. While hunting was still of some importance, specially in mountain areas, food production became finally dominant.
Lithic industry persists but some tools were already made of copper (axes, knives, etc.). Gold is also used for ornaments.
An important phenomenon in the late Chalcolithic is the Bell Beaker phenomenon of pan-European extension. Also through all the period Megalithism, specially in the form of burials in dolmens, was widespread.
Read more about this topic: Basque Prehistory