The image is a photograph of a wooden plaque on a wall. The plaque is made of wood and has a text written on it in black ink. The text reads "Lithic artifacts at Sanxingdui were made from many varieties of stones including metamorphic rock, tuff, feldspar-sandstone, mica-clay, amphibole, porphyry, as well as nephrite, white marble, and manchurian jade. Petrographic studies have primarily indicated that the raw material came primarily from the southern extension of the Longmen mountains in the area of Maoxian county, Wenchuan county and Guanxian county. Due to its hardness and toughness, many techniques were developed to wear down the material, including sawing, drilling, grinding, and polishing. In the second half of the last century, large quantities of raw materials and whetstones were unearthed at the Sanxingsdui site. Together, these findings indicate that technology was practiced with advanced technology and in considerable scale in the ancient state of Shu."