How to detect the authenticity of Guizhou dragon fossils?

"Guizhou Dragon" fossil is produced in Lvyin Village, Ding Xiao Town, Xingyi City, Guizhou Province. The fossil "Guizhou Dragon" was discovered by Mr. Hu Chengzhi in 1957. It was identified by Professor Yang as a long-winged, Leo and Guizhou Dragon, and it was confirmed as a new species and genus, named "Guizhou Dragon". "Guizhou Dragon" is a small amphibian primitive reptile vertebrate. In the upper part of the Middle Triassic10.50 billion years ago, Lvyin Village in Ding Xiao Town was a coastal sedimentary area in geological period, with clear water quality and abundant other creatures and fish, which bred a large number of "Guizhou dragons". Because of its unique paleogeographic environment, the water body is sometimes stable and sometimes quiet; The sediments change periodically from time to time, and a set of thin silty calcareous shale and clayey calcareous shale are deposited, which constitutes the sand shale-carbonate facies stratum. The dead "Guizhou Dragon" was quickly submerged by sediments, which quickly changed and crystallized into fossils, so that the "Guizhou Dragon" fossils were completely preserved in this set of rocks. Since 1957 discovered "Guizhou Dragon", few people have collected it, and some geological research units have come here to work and study. The local villagers are just curious to see, and they have been silent in this bare production area for more than 30 years. Due to the all-round development of market economy and the gradual rise of personal collection, fossils have become a special commodity. In order to pursue personal interests, "Guizhou Dragon" became the target of hunting. Smuggling and reselling are becoming more and more serious. In the mid-1980s, the quiet top-effect town of Luyin Village boiled, and hundreds of villagers rushed to the fossil burial place day and night. Buyers from all over the country also flocked, which accelerated the indiscriminate mining and digging. The origin of fossils is riddled with holes, and many exquisite and complete "Guizhou Dragon" fossils were destroyed by hammers, steel, detonators and explosives. At first, the buyer only used five yuan and ten yuan each, but later it developed to one hundred yuan and one thousand yuan, with a value of ten thousand yuan, and a large number of complete and exquisite "Guizhou Dragon" fossil specimens were lost at home and abroad. This situation continued until the early 1990s, when the local government formulated the Regulations on the Protection of Guizhou Dragon Fossil and demarcated the protected areas, so as to stop the indiscriminate mining and excavation. Because the origin of the "Guizhou Dragon" fossil has been controlled, a large number of counterfeit "Guizhou Dragon" fossils flooded the market, confusing the fake with the real. 2. The real fossil feature of "Guizhou Dragon" is a small amphibian primitive reptile vertebrate (Figure 1). Generally, it is 20-30cm long from the top of the head to the tip of the tail. The neck and tail are slender, and the head has two round and obvious eye holes. There are webbed joints between the toes. There is no difference in the length of feet, and the number of skeletons remains the same. The bone structure is clear and has become a fossil. The bone has been filled with phosphate minerals apatite, which is dark and hard. The friction hardness is 5. There is phosphorus reaction in chemical test, but no fluorescence reaction in bone under ultraviolet fluorescence irradiation. Epigenetic rocks are calcareous shale containing silty sand and calcareous shale containing clay, with a thickness of 1- 10 cm and a light brown-yellow-gray color. Rock has silty texture, silty texture, microscale texture, directional texture and layered texture. The mineral composition is mainly calcite, and contains calcite, illite, feldspar, muscovite, chlorite, anatase, carbon and pyrite. 3. The characteristics of the fake "Guizhou Dragon" fossils The fake "Guizhou Dragon" fossils exist in the following form (1). The skeleton of Guizhou Dragon is carved on a thin rock, which is filled with black asphalt bonded rock powder. Detection methods: identification of bone composition, ultraviolet fluorescence analysis, detection of bone fiber cell structure under polarizing microscope, phosphorus reaction in chemical experiment and lithology detection. (2) Carve the skeleton of Guizhou Dragon on the thin rock and fill it with black phosphate rock powder bonded with polymer. Detection methods: identification of bone composition, ultraviolet fluorescence analysis, detection of bone fiber cell structure under polarizing microscope, phosphorus reaction in chemical experiment and lithology detection. (3) Carving the skeleton of Guizhou Dragon on thin rock and filling it with black siliceous rock powder bonded with polymer. Detection methods: identification of bone composition, ultraviolet fluorescence analysis, detection of bone fiber cell structure under polarizing microscope, phosphorus reaction in chemical experiment and lithology detection. (4) Carve the skeleton of Guizhou Dragon on the thin rock, and bond the broken skeleton of Guizhou Dragon with polymer. Detection methods: ultraviolet fluorescence analysis, polarizing microscope detection of bone fiber cell structure and lithology detection. (5) Carving the bone shape of Guizhou Dragon on the thin rock, and bonding the broken bone powder of Guizhou Dragon with polymer. Detection methods: identification of bone composition, ultraviolet fluorescence analysis, detection of bone fiber cell structure under polarizing microscope, phosphorus reaction in chemical experiment and lithology detection. (6) The skeleton shape of Guizhou Dragon is incomplete on the thin rock, and the broken bone powder of Guizhou Dragon is repaired by polymer bonding. Detection methods: bone composition identification, ultraviolet fluorescence analysis, polarizing microscope detection of bone fiber cell structure, phosphorus reaction in chemical experiments.