The chronological systems of the Central Andes area with two main stages, Preceramic and Ceramic. The Ceramic is broken down into: Initial Period, 1900-1200 BC, Early Horizon 1200-300 BC, Early Intermediate Period 300 BC-700 AD, Middle Horizon 700-100, Late Intermediate Period 1100-1438/1478, and Late Horizon 1438-1532. These horizon periods are times of widespread unity in cultural traits. Intermediate periods are times of cultural diversification.