Archaeologists divide the pre-Columbian history of Mesoamerica into the Preclassic period (3000 BC to 250 AD), the Classic period (250 to 900 AD), and the Postclassic period (900 to 1500 AD). Until recently, the Preclassic was regarded by researchers as a formative period, in which the peoples typically lived in huts in small villages of farmers, with few permanent buildings.