The Beiyuan relic site. [Photo/Xinhua]

More than 300 items used by prehistoric people in their daily life 4,000 years ago were unearthed in Northwest China's Ningxia Hui autonomous region.

Wang Xiaoyang, head of the archaeological team, said on Monday that the pieces were found in the Beiyuan relic site, where the excavation area covers 800 square meters.

The pieces include clay pots, basins, cups and knives, stone axes and chisels, as well as bone awls and needles. Archaeologists also found clamshells which they believed were used for decoration.