Phycodes等遗迹化石在吉林南部早寒武世地层中发现的意义

THE DISCOVERY OF THE PHYCODES AND OTHER ICHNOFOSSILS OF THE EARLY CAMBRIAN STRATA IN THE SOUTHERN PART OF JILIN PROVINCE AND ITS SIGNIFICANCE

在吉林省通化市，通化─浑江北线公路的北侧五台山（水洞西山）的早寒武世水洞组中发现了Ｐｈｙｃｏｄｅｓｐｅｄｕｍ等遗迹化石。从国际上近年来研究上前寒武系（“新元古Ⅱ”）─寒武系界线的一些重要成果，均以全球的一些典型剖面的实际材料，讨论了遗迹化石组合和序列特征，都说明含此类遗迹化石的岩石地层，其地质时代应为早寒武世早期。而从遗迹化石组合表明应属Ｓｋｏｌｉｔｈｏｓ遗迹相，指示古沉积环境为潮间带。

The Phycodes pedum and other ichnofossls were discovered from the early CambrianShuidong Formation in the northern Wutaishan Tonghua-Hunjiang , Northern road,Jilinprovince. On the basis of some important research results of the upper Precambrian(“Neo-Proterozoic Ⅲ”)-Cambrian in the world and some world-wide key sections,the ichnofossil as-semblages and successive features are discussed,showing that the geological time of this stra-ta which contain ichnofacies should be early-lower Cambrian.The ichnofossil assemblagesshow that it belongs to skolithos ichnofacies,indicating that the paleosedimentary environ-ment belongs to an intertidal zone.