In the Neolithic age, Dawenkou Culture. It is 15 cm long, 10.1 cm wide and 0.5 cm thick. It was unearthed at Dawenkou site in Tai'an, Shandong Province in 1959. Ritual vessels. Trapezoidal flat shape, shoulders obliquely retracted, outer arc of the blade, shoulder drilling two holes of size. Collected by Shandong Provincial Museum.