【摘要】 在总结近二十年来有关我国东北地区中生代地层研究诸多新发现与新进展的基础上 ,以生物化石为主要依据 ,以 "海相检验法”及国际性生物地层对比为标准 ,结合同位素年代地层学新资料 ,对东北地区中生代地层的划分及对比 ,提出了新的方案。文中还讨论了三叠系 -侏罗系界线、侏罗系 -白垩系界线及下白垩统 -上白垩统界线的划分以及辽西义县组的时代。同时 ,还首次报道了笔者等对黑龙江东部龙爪沟群研究的最新进展 ,并提出了对龙爪沟群时代及与鸡西群对比的新认识。更多还原

【Abstract】 Northeast China Mesozoic strata are very well developed and highly fossiliferous. In the past two decades, new findings from marine and non marine fossiliferous strata were found there, such as the discoveries of Late Triassic conodonts, Early Cretaceous bivalves, dinoflagellates and ammonites in eastern Heilongjiang, particularly, of the Late Jurassic “feathered” dinosaurs ( e.g. Sinosauropteryx ), birds ( e.g. Confuciusornis ), mammals (e.g. Zhangheotherium ) and the oldest known flowering plant Archaefructus in the lower Yixian Formation of western Liaoning. Along with the information obtained, the division and correlation of the Mesozoic strata of northeastern China have been further justified. Besed on the “method of stratigraphic study checked by marine fossil evidences” and the international biostratigraphic correlation, combined with isotopic study, the authors make a new proposal on the division and correlation, in the present paper. Meanwhile, the authors discuss on the T J, J K and K 1 K 2 boundaries in the above mentioned areas with new data gained by the recent biostratigraphic studies, and discuss also some problems concerning the biostratigraphy, such as the age of the Yixian Formation of western Liaoning and the Longzhaogou Group of eastern Heilongjiang and its correlation with the Jixi Group. The authors consider that the lower Yixian Formation is Latest Jurassic in age,which is evidenced by the “feathered” dinosaurs e.g. Sinosauropteryx and Protarchaeopteryx which can be compared with the Tithonian Compsognathoid and Archaeopteryx from Solnhofen of Germany respectively; and by the Dendrorhynchoides not younger than Late Jurassic so far known from the biostratigraphic records of the world. Meanwhile,the authors consider the Longzhaogou Group to be of Early Cretaceous (not Jurassic) age based on the latest identification of the ammonites from this group as Pseudohaploceras ranging from in age the Barremian and on some new finds of marine bivalves (e.g. Aucellina ) and dinoflagellates (e.g. Vesperopsis ) from the group. The Longzhaogou Group can be correlated with the Jixi Group which has been proved to be Early Cretaceous by much more new palaeontological discoveries.更多还原