Jialing River Basin, Qinling Mountains, Daba, Longmen and Minshan all belong to Paleozoic Triassic, Silurian and Mesozoic, Jurassic and Cretaceous. The continental crustal plates are the northern continent and the South China Sea. At that time, the western terrain was the ancient Mediterranean and Guangyuan was the ancient sea area. Due to the suitable natural ecological environment and warm climate, a large number of primitive animals and plants grow in the ocean. Coral is a marine coelenterate, which grew widely at about 30℃ in Paleozoic geological period, with four kinds of corals dominant, six kinds of corals appeared in Mesozoic, and eight kinds of corals were more common in Cenozoic. The so-called eight corals mean that they have eight beds and eight tentacles, and corals rely on these tentacles to absorb food from the sea and grow and develop. Coral in the sea grows very slowly. Judging from the growth lines and growth lines of corals after they become fossils, it takes about 1000 years for a coral animal with a height of more than one meter to grow. After coral died, its body was gradually replaced by calcium carbonate formed by the combination of free CO2 and Ca cations in seawater. This process is called calcification, also known as fossilization. As a result of this process, organic animal corals have become inorganic fossil corals. If coral is combined with silicon, coral stone will become jade under certain conditions. The density of coral stones is relatively high (generally around 2.7), and the hardness varies from 4 to 5. Because the types of marine corals are mostly colored corals such as northern corals, blue corals, black corals, yellow corals and green corals, there are few red corals, so red corals have become synonymous with precious corals and are the main raw materials for carving works of art and jewelry. Red coral is a general category name, including red coral, pink coral, pink coral, pink coral and so on. Red coral is precious because it contains trace elements beneficial to human health and because its color is pure natural. In the deep-sea waters where red corals are distributed, there are a lot of volcanic activities on the seabed, which provide a lot of volcanic ash, which is rich in a certain number of macro elements (such as colored elements such as iron, copper and manganese, colorless elements such as magnesium, potassium and sodium) and trace elements (such as zinc, chromium and nickel). If iron is the main element absorbed by coral in the process of fossilization, the color of coral stone will be red; If the absorbed element is mainly magnesium and contains a small amount of iron, the color of coral stone will be pink or pinkish white; If the absorbed element is mainly magnesium with almost no other impurities, then the color of coral stone may be white. Abnormal areas are all high-risk areas of volcanic seismic activity in the world, including submarine volcanic activity near the ancient Mediterranean. The development of submarine volcanic activity provides a large number of major elements such as iron, manganese and magnesium. This provides important material conditions for the color of red coral. Coral died naturally and became coral, which was deposited under the geological forces of Caledonian, Variscan, Alpine, Yanshan and Himalayan tectonic plates. After the orogeny in Jixian, Jiangnan, Kunming, Yunnan, Sichuan and Longshan, the marine strata such as Qinling, Longmen and Minshan have deposited the remains of paleontology such as corals. Due to the complex and changeable stratigraphic structure, folds and cracks, overlapping faults and mineral discovery. After hundreds of millions of years of cracking, collapse, weathering, peeling, accumulation, scouring and erosion, under the action of river water, a large number of paleontological fossils and rock minerals are scattered on the terraces and tributary rapids in the middle and upper reaches of Jialing River, absorbing the aura of heaven and earth and the essence of the sun and the moon, like Nu Wa's stone smelting. The red coral stone recorded in Ci Hai: Coral is "the calcareous skeleton of ancient coral, the fossil preserved after fossilization ... distributed in the strata from Cambrian to Silurian to Quaternary." Corals in Ci Yuan: "Red corals are produced in the Mediterranean Sea, and their bones are hard and beautiful, so they can be used as decorations." The top hat worn by Qing officials is made of red coral, carved coral, sapphire, lapis lazuli, crystal stone ... and finally gold and silver. Red coral is listed as one of the "seven treasures" in Buddhist scriptures. In Tibet, only temples, nobles and the rich can own it. High-quality red corals are mostly used as decorations for Buddha statues and are regarded as auspicious, rich, mysterious and respectful sacred objects. There are more than 2,000 species of corals, and there are few species of coral fossils collected in geological museum, China, and even fewer species of red coral fossils. Generally, the species of coral fossils in Jialing River in Guangyuan are mainly Paleozoic four-ray corals and Mesozoic six-ray corals, including gray pebble-shaped chain corals and honeycomb corals, with less black and green corals and less red corals. The pebble-shaped block is wrapped by a thin layer of gray quartz sand, which is basically jade-shaped, although it is different from the dendritic red coral stone produced on the modern seabed.