The earliest evidence of wooden coffin remains, dated at 5000 BC, was found in the Tomb 4 at Beishouling, Shaanxi. Clear evidence of a rectangular wooden coffin was found in Tomb 152 in an early Banpo site. The Banpo coffin belongs to a four-year-old girl; it measures 1.4 m (4.6 ft) by 0.55 m (1.8 ft) and 3–9 cm thick.