【摘要】 在华北地区古元古代(氵虍手)沱群豆村亚群的大石岭组、青石村组(约2500～2400Ma)和长城群的常州沟组、串岭沟组(1800～1700Ma)中存在着大直径的球形和形态呈三角形、多角形及船形微古植物,根据它们的大小、外部形态和内部结构等综合判别,它们可能属于单细胞真核浮游生物。这些资料表明,地球早期单细胞真核生物可能始于古元古代早期的(氵虍手)沱群底部(约2500～2400Ma),而到古元古代晚期的长城群(1800～1700Ma)已相当繁盛。因此有可能将真核生物的地质记录从1800～1700Ma提前到2500～2400Ma。更多还原

【Abstract】 A number of microplants with spherical, triangular, polyangular and boat-like shapes have been found both from the early Palaeoproterozoic Dashiling and Qingshicun Formations (ca. 2500- 2400 Ma) of the Doucun Subgroup of the Hutuo Group and the late Palaeoproterozoic Changzhougou and Chuanlinggou Formations (ca. 1800 -1700 Ma) of the Changcheng Group in North China. According to the features of these fossils, such as size, external shape and internal structure, they may belong to unicellular eucaryotic planktons. These data indicate that the earliest unicellular encaryotes on the Earth might have appearred in the lower Hutuo Group (ca. 2500- 2400 Ma) of the early Palaeoproterozoic and were rather prosperous to the late Palaeoproterozoic Changcheng Group (ca. 1800-1700 Ma). For this reason, the geological records of eu-caryotes may be moved up to 2500-2400 Ma from 1800-1700 Ma.更多还原