云南曲靖早泥盆世惹丁阶脊椎动物的性质

<正> 云南曲靖早泥盆世翠峰山组自下而上依次被分为四段:西山村段、西屯段、桂家屯段和徐家冲段,各段连续沉积。西山村段和西屯段的脊椎动物化石最丰富,不仅种类多,数量大,而且保存也相当好,与翠峰山组另外两段相比,研究程度较高;两段被认为相当于欧

Nature of the Early Devonian Gedennian vertebrates from Qujing, Yunnan

The age of the Xishancun and Xitun Members, which contain the fossil agnathas (Galeas-pida and Thelodonti) and fishes (Acanthodii, Crossopterygii, Dipnoi, Arthrodira, Antiarchi and Chondrichthyes), is probably Gedinnian. The life-habitat of The Gedinnian agnathas and fishes of Qujing was a marginal marine environment judging from the fossil chondrich-thyes (Gualepis elegans Wang, Changolepis tricuspidus Wang, Peilepis solida Wang and Ohio-lepis xitunensis Wang), the marine or marginal marine fossil invertebrates (Chitinozoa, Acri-tarchs, Bivalves, Inarticulate brachiobods, etc) and fossil algaes, so author thinks that the Gedinnian agnathas and fishes of Qujing were not real freshwater fishes. The Gedinnian vertebrate fauna of Qujing was not endemic except for Galeaspida and Yunnanolepids which were two highly endemic groups.