The reporter learned from Shaanxi Geological Survey Institute on the 2nd that the Institute recently invited many experts to carry out the investigation and identification of dinosaur footprint fossils in Northern Shaanxi in Yan'an City. The experts agreed that the investigation and research had made a new breakthrough. According to reports, since the discovery of dinosaur footprint fossils in Shenmu City, Northern Shaanxi in 1929, researchers have found dinosaur footprint fossils in Yulin City, Shangluo City and other places. At present, in addition to the 8 newly discovered and determined by Shaanxi Geological Survey Institute, the number of dinosaur footprint fossils in Northern Shaanxi has reached 15, accounting for 79% of the province, including 8 in Yulin and 7 in Yan'an. Dinosaur footprint fossils found in Northern Shaanxi have resource endowments such as wide geographical and stratigraphic distribution, diverse assemblage forms and great scientific research value. The expert appraisal team inspected the dinosaur footprint fossil sites located in luojiagou, Ganquan Grand Canyon and Ansai Liugou hills in Ganquan County. After two days of field investigation and indoor discussion, the experts agreed that new breakthroughs had been made in the investigation and research. The dinosaur footprint fossils discovered by Shaanxi geological survey expanded the geographical and stratigraphic distribution of dinosaur footprint fossils in China, and laid a solid foundation for the next discovery of dinosaur skeleton fossils in Northern Shaanxi. There are various types of dinosaur footprint fossils found in Ganquan County, Yan'an City. Among them, the longest theropod footprint is 60.5cm, which is the largest known theropod footprint in China. The smallest length is less than 3cm, which is one of the smallest known theropod footprints in China; Sauropod footprints were recorded for the first time in Shaanxi Province; The footprints of turtles and turtles are rarely found in the Jurassic in Asia; The symbiotic remains of dinosaurs, crocodiles and turtles are extremely rare in China. According to experts, the value level of dinosaur footprint fossils found in luojiagou and fengjiawan of Ganquan County is very high, and individual fossils also preserve extremely rare dinosaur foot skin texture marks. The expert appraisal group said that the results of this investigation are of great scientific and social value. Dinosaur footprint fossils in Northern Shaanxi contain important information about the survival and evolution of Mesozoic dinosaur fauna and environmental changes. They are precious and non renewable geological relic resources and have extremely important scientific and social value. It is suggested to start the comprehensive investigation and Research on dinosaur footprints and dinosaur skeleton fossils in Northern Shaanxi as soon as possible, strengthen the investigation, research and protection, and build professional science popularization and protection venues. (outlook new era)