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水杉类在六千万年前的白垩纪后期,曾广泛分布于北半球北部,到三千万年前新生代的始新世,由于气候变得寒冷干燥,水杉类逐渐南移,至东亚、北美及欧洲等地,分布到我国东北大兴安岭一带,但至今只发现有水杉化石的存在。在本世纪四十年代初,始在我省利川县的谋道溪、水杉坝一带,发现有幸存的水杉古树千余株,曾引起植物介的重视,被认为是本世纪的重要新发现。在利川县小河公社水杉坝一带,不仅保留着生存的水杉古树,在水田坝中还埋藏着大量的水杉阴沉木,和大批残存的水杉古树蔸,每年从泥田中挖起的阴沉本达二、三十
Metasequoia species 60 million years ago in the Late Cretaceous, was widely distributed in northern Northern Hemisphere, 30 million years ago, the Cenozoic Eocene, because the climate becomes cold and dry, Metasequoia gradually moved south to East Asia, North America And Europe and other places, distributed to the northeast Daxinganling area, but so far only found in the presence of metasequoia. In the early 1940s of this century, more than 1,000 trees of ancient Metasequoia found in the Mouduo River and the Shuishanba area of Icheon County in our province started to attract the attention of plants and were considered as important new discoveries of this century . In Lishuan County Creek commune metasequoia dam area, not only retained the survival of the old tree, paddy in the paddy also buried a large number of Metasequoia gloomy trees, and a large number of remaining trees of Metasequoia, every year from the muddy fields dug gloomy Bende Second, thirty