The long-occupied mound at Huaca Prieta in the Chicama Valley, the best-known site of the maizeless, potteryless, early farmers, was abandoned before the culture of its habitants had improved greatly, and the best data for the ensuing period come from excavations in the Virú Valley, a little to the south, where also is found a less-known site of the Early Agricultural Period, Cerro Prieto.
Source: wiktionary