On this day, 70 years ago, on March 21, 1955 (February 28, 1955, the lunar calendar), our country discovered for the first time fossils of fossils 300 million years ago. On March 21, 1955, my country discovered for the first time the fossils of a 300 million-year-old ancient creature-a fish. This fish fossil was discovered by Le Senxun, a professor at the Department of Geology of Chongqing University, in Jiangyou County, Sichuan, so it was named "Le's Jiangyou Fish".