Paleoclimate Significance of the Middle Jurassic Flora in the Western Hills of Beijing

• 责任者：Zhang Yingfang (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Jiang Junwei
• 刊名：Geology in China
• 出版年：2010
• 卷期：37(2)
• 关键词：中侏罗世 ; Middle Jurassic ; 植物群研究 ; floral studies ; 古气候 ; paleoclimate ; 北京 ; Beijing
• 页码：p. 515-524
• 图表：2 illus., 3 tables, 1 plate, 31 refs.
• 分类号：1102
• issnNo：ISSN1000-3657
• isbnNo：CN11-1167/P

Plant fossils of 38 species in 22 genera in Middle Jurassic were collected from Lower Yaopo Formation, Upper Yaopo Formation and Longmen Formation on the southern slope of the Jiulong Hill in Mentougou district, Beijing. Statistical data show that the Middle Jurassic flora of the Western Hills in Beijing is dominated by Filicopsida (27.6%), Cycadopsida (25%) and Ginkgopsida (25%), among which Coniopteris with 5 species and Cladophlebis with 17 species were found. The result indicates that the nearest living relative plants of dominant fossils are Osmundaceae, Dicksoniaceae and Cycadopsida, which mainly live in a humid-warm tropical or subtropical climate, and warm-humid climate is also identified from the diversity of Cladophlebis, large feathery compound leaves of Cycadopsida and coarse stems of Equisetales, etc.