Pre-columbian Civilizations, The Middle Horizon

Both Pucar� and Tiwanaku were early forms of what became known as the Middle Horizon, an expansion of multiple-valley political rule that had two centres: one in the southern Altiplano, the other centred on Huari (Wari), near the modern Peruvian city of Ayacucho. This development is usually dated about AD 600. Some Tiwanaku effigy vessels have been discovered at Huari, but