Green jade disc serves as ritual object in Neolithic period

This green jade bi disc, dating back to the Neolithic period, is flat and has a lime-white patina and a crack line on its surface. The inner wall of its hole shows signs of drilling on one side. Such a disc served as a kind of ritual object in ancient sacrificial activities. Now, it is a treasure housed in the Yuncheng Yanhu District Museum in Shanxi province.