The keel stone is an animal fossil. The cause is that after the animal is buried in the soil, the organic matter in the bone is dissolved and lost by the groundwater, and the minerals such as calcium in the water are precipitated. After long-term replacement, the essence of the bone completely changes, but the bone remains. The original form becomes a fossil. Animal fossils are buried in a layer of gray-yellow sandy soil, which is dominated by birds and rodents, and has certain scientific value. Located 490 kilometers northeast of Chongqing City, Longjingpo, Temple Town, Wushan County, also known as Wushan Longgupo Site. In 1985, giant teeth were discovered. In 1986, Wushan monk fossils with two teeth were discovered. According to the Institute of Geology of the Chinese Academy of Sciences, its age is about 201 to 2.04 million years ago. It is more than 200,000 years earlier than the Yuanmou people. It is the earliest ancient human fossil discovered in China. At the same time, a large number of ancient mammalian fossils, such as beavers, buttercups, bamboo rats, former Chinese bears, saber-toothed tigers, former Chinese clawed beasts, and Chinese ancient wild cattle, were found. Wuling keel is produced by the valley river in Wuling Mountain Area in the Xiangxi Autonomous Prefecture of Hunan Province. The stone is hard and can be heard with a finger, and you can hear the sound of crisp and sweet; there are holes in the stone body, holes in the holes, and the holes are connected in series; mostly brownish red, deep and shallow, deep to purple The stone is covered with red silk veins and veins, and the color is beautiful; the shape is peculiar, exquisite and exquisite, twisted and lubricated, natural and soft, and also very similar to animal bones; and has the characteristics of thin, wrinkled, transparent and leaky, hence the name keel stone . Fashion Fabric,Cotton Twill Fabric,Woven Rayon Fabric Soft,Stretch Air Layer Fabric Shaoxing Xiaotrain Imp.&Exp Co., Ltd , https://www.xiaotrain.com