circa 3000-2000 B.C.
with three deep notches and three small projecting ‘teeth’ evenly spaced around the outer rim, the wide central circular aperture with slightly convex edge, the sides gently tapered to a slightly thinner outer rim with rounded edge, the surface smoothly polished and glossy all over, the opaque milk white stone finely speckled and with scattered remains of encrusted earth.
Diameter 5 7⁄8 inches (15 cm)
Compare the similar jade notched disc excavated at a Neolithic burial site at Heshangfangzixiang, Jianchang county, Liaoning province, illustrated by Sun in the essay “Preliminary Discussions on the Prehistoric Jade Culture of Northeast China,” published in a series of research papers organized by the Centre for Chinese Archaeology and Art at the Chinese University of Hong Kong, by Tang (ed.), Dong Ya yuqi (East Asian Jades: Symbol of Excellence), Vol. 1, Hong Kong, 1998, p. 112, pl. 11.2:3.
新石器時代 玉牙璧 徑15厘米