Living fossil significance of Metasequoia glyptostroboides

Metasequoia glyptostroboides and Metasequoia glyptostroboides are living fossils.

Ginkgo biloba first appeared in the Carboniferous period 345 million years ago. Ginkgo biloba was widely distributed in Europe, Asia and America in the northern hemisphere, widely distributed in the northern hemisphere in Mesozoic and Jurassic, and began to decline in the late Cretaceous. By 50,000 years ago, it was extinct in most parts of Europe, North America and Asia, and only China's was preserved. Ginkgo biloba distribution mostly belongs to artificial cultivation areas, mainly cultivated in China, French and South Carolina. There is no doubt that foreign Ginkgo biloba was introduced directly or indirectly from China.

There were about 6-7 species of Metasequoia in Mesozoic Cretaceous and Cenozoic, which were considered extinct in the past. 194 1 year, China botanists first discovered this famous ancient and famous tree in Modaoxi, Wanxian County, Sichuan Province, Modaodao Town, Lichuan, Hubei Province. According to the investigation in recent years, giant trees over three years have been found in Wanzhou, Shizhu County, Hubei Province, Lichuan, Longshan and Sangzhi, Hunan Province.