Neolithic
In the 6th millennium BC, Andalusia experiences the arrival of the first agriculturalists. Their origin is uncertain (though North Africa is a serious candidate) but they arrive with already developed crops (cereals and legumes). The presence of domestic animals instead is unlikely, as only pig and rabbit remains have been found and these could belong to wild animals. They also consumed large amounts of olives but it's uncertain too whether this tree was cultivated or merely harvested in its wild form. Their typical artifact is the La Almagra style pottery, quite variegated.
The Andalusian Neolithic also influenced other areas, notably Southern Portugal, where, soon after the arrival of agriculture, the first dolmen tombs begin to be built c. 4800 BC, being possibly the oldest of their kind anywhere.
C. 4700 BC Cardium Pottery Neolithic culture (also known as Mediterranean Neolithic) arrives to Eastern Iberia. While some remains of this culture have been found as far west as Portugal, its distribution is basically Mediterranean (Catalonia, Valencian region, Ebro valley, Balearic islands).
The interior and the northern coastal areas remain largely marginal in this process of spread of agriculture. In most cases it would only arrive in a very late phase or even already in the Chalcolithic age, together with Megalithism.
Read more about this topic: Prehistoric Iberia