辽宁沈北煤田早第三纪植物群的发现

Discovery of Early Tertiary Flora in Shenbei Coalfield, Liaoning

辽宁沈北煤田位于沈阳市北郊３０余ｋｍ处，为第四纪冲积层广泛覆盖的平地，基岩出露极少．据辽宁省煤矿管理局地质勘探局的普查，煤田地层由老至新依次为：前震旦系、震旦系、侏罗系、白垩系、下第三系、上第三系和第四系．沈北煤田的煤层主要产于下第三系，下第三系自上...

The authors studied the fossil plants collected from Yangliantun formation in Shenbei Coalfield of Liaoning,considered that they belong to the late stage of Early Tertiary (i e Oligocene),and discussed the relationship between the Shenbei flora and the Fushun flora. Fossil plants are listed as follows: Metasequoia disticha (Heer) Miki, Sequoia chinensis Endo emend Wang et Li, Taxodium tinajorum Heer, Magnolia sp , Cinnamomum naitoanum Huzioka et Takahasi, Schisandra fushunensis Li, Trochodendron sp , Cercidiphyllum arcticum (Heer)Brown, Hamamelites inaequalis (Newberry)Brown, Celtis peracuminata Brown, Dryophyllum fushunense Chen et Wang, Quercus sp , Betula dissecta Tao, B fushunensis Chen, Carpinus sp , Populus sp , Salix sp , Firmiana sp etc .The discovery of this flora is important for furth study on distribution and evolution of fossil Hamamelididae.