The Dawenkou culture is a name given by archaeologists to a group of Neolithic communities who lived primarily in Shandong, but also appeared in Anhui, Henan and Jiangsu, China. The culture existed from 4100 to 2600 BC, co-existing with the Yangshao culture. Turquoise, jade and ivory artefacts are commonly found at Dawenkou sites. The earliest examples of alligator drums appear at Dawenkou sites. Neolithic signs, perhaps related to subsequent scripts, such as those of the Shang Dynasty, have been found on Dawenkou pottery.