information:highlighting, structural:reformatting
Chalcolithic

In the Chalcolithic (c. 3000 BCE), a series of complex cultures developed that would give rise to the peninsula's first civilizations and to extensive exchange networks reaching to the Baltic, Middle East and North Africa. Around 2800 – 2700 BCE, the Beaker culture, which produced the Maritime Bell Beaker, probably originated in the vibrant copper-using communities of the Tagus estuary and spread from there to many parts of western Europe.