陕西镇巴早寒武世的牙形刺形化石

记述了陕西镇巴小洋坝下寒武统筇竹寺阶灯影组西蒿坪段及水井沱组内的一些牙形刺形化石,共计4个属7个种,其中新属及新种各一个,我国首次发现的有2属4种。它们中的许多分子具有地理分布广泛、演化迅速的特点,已成为早寒武世洲际地层对比的重要依据。

THE CONODONT-LIKE FOSSILS OF EARLY CAMBRIAN IN ZHENBA, SHANXI

This paper deals with the implication of the conodont-like fossils of the Earl. -Middle Cam-brian, according to their morphology, texture and distribution. Some elements of conodont-like fossilsare found in Xiaoyangba, Zhenba, Shanxi from Xihaoping Member of Dengying Formation and Shui-jingtuo Formation of Lower Cam brian. Four genera and seven species conodont-like fossils are de-scribed systematically. Among them 1 genus and species are new, and 2 genera and 4 species are firstfound in China. They are Grapparodus bisulcutus(Muller), G. communis sp. nov., Amphigeisina danica(Poulson), Hagionella cultrata (gen. nov.), Rhombocorniculum ualliser (Mambetov), Rho. insoluturn Mis-sarzhevsky, Pho. cancellatum (Conbbold). Many of them are characterized by wide geographic distribu-tion and quick evolution, and may be the important basis of stratigraphic correlation of Early Cambri-an in the world.