摘要
大同永定庄组系指大同组之下的侏罗纪沉积。这组地层一度被误称为“怀仁群”,时代定为二叠—三叠纪。现在一般认为它属于早侏罗世。永定庄组的植物化石过去极少记载。近年来,不断有所发现,但迄今尚无正式描述报道。1981年,我们在观察大同煤峪口、七峰山大石头沟、口泉北沟和永定庄华严寺等中生代地层剖面时,于永定庄组的中、下部采到许多植物化石,经初步研究有21属、25种之多。
The fossil plants dealt with in the present paper were collected from the Yongdingzhuang Formation of the Datong coalfield.The Yongdingzhuang Formation is disconformably overlain by the Tatung Formation of Middle Jurassic and overlies discdnformably on the Taiyuan Formation of Carboniferous.The fossil plants described here are totally 21 genera and 25 species,of which 3 are identified as new and 8 are specifically indeterminable.They are:Lycopodites huay ansiensis sp.nov.,Equisetites,of.koreanicus Kon’no,Neocalamites sp.,Radiates sp.,Coniopteris hymenophylloides(Brongniart)Seward,Eboracia lobifolia(Phillips)Thomas,Cladophlebis hsiehiana Sze,Cladophlebis sp.1,Cladophlebis sp.2,Tyrmia calcariformis sp.nov.,Tyrimia nathoristi(Schenk)Ye,Nilssonia spp.,Pseudoctenis rhabdoides sp.nov.,Cycadolepis corrugata Zeiller,Ginkgoites of.sibiricus(Heer)Seward,Sphenobaiera of.huangi(Sze)Hsu,Czekanowskia of.rigida Heer,Phoenicopsis angustifolia Heer Ixostrobus lepida(Heer)Harris Lindleycladus lanceolatus(L.et H).Harris,Swedenborgia cryptomerioides Nathorst,Strobilites sp.1,Strobilites sp.2,Conites sp.and Carpolithus sp.As shown by the plants listed above,the flora of the Yongdingzhuang Formation is characterized by the"Coniopteris-Phoenicopsis"assemblage of North China.It includes also many forms commonly seen in the Liassic,such as Equisetites cf.koreanicus,Neocalamites sp.,Coniopteris hymenophylloides,Cladophlebis sp.,Tyrmia nathorsti,Cycadolepis corrugata,Sphenobaiera of.huangi,Pkoenicopsis angustifolia,Czekanowskia cf.rigida,Swedenborgia cryptomerioides.These forms are generally regarded as the representatives of the floras of the Hsiangchi Formation in Western Hubei,the Baitianba Formation in Northern Sichuan,the Wutangkou Formation in Nei Mongol,the Xiahuayuan Formation in Xuanhua of Hebei and the Hsiangshan Group in Jiangsu.Therefore,the flora is apparently older than that of the Middle Jurassic Tatung Formation.It may be tentatively assigned to be late Liassic age.
作者
厉宝贤
胡斌
Li Bao-xian;Hu Bin(Nanjing Institute of Geology and Palaeontology,Academia Sinica;Jiaozuo Mining College)
出处
《古生物学报》
1984年第2期135-147,257-260,共17页
Acta Palaeontologica Sinica
