滇中易门地区发现化石新物种

The discovery of new fossil species in the Yimen region,central Yunnan

通过1∶50 000区域地质调查,在滇中易门地区前人划分的中元古界东川群鹅头厂组灰黑色炭泥质板岩中首次发现了大量保存较好的宏体多细胞生物化石。通过镜下分析、电子探针及电镜扫描的研究,确证其是迄今为止生物结构最为完整的个体较大的多细胞宏体生物化石,填补了云南境内前寒武纪地层无生物化石的空白,宏体生物化石的发现有重大的科学意义及科研价值,是地球早期生命演化研究领域中一项重大的科学发现对地球早期地球环境演化与生命进化的研究具有重要价值。

Through 1： 50 000 regional geological survey,a large number of well-preserved multicellular macrosomal fossils were discovered for the first time in the grayish black carbonaceous muddy slates of the Etouchang Formation of the Mesoproterozoic Dongchuan Group in the Yimen region,central Yunnan. It is inferred from the zircon U-Pb age data that these fossils may be dated at ca. 2200 Ma. The microscopic analysis,electron probe analysis and electron microscopic scanning analysis have confirmed that these fossils are the largest multicellular macrofossils with the most complete biological structures,and fills up the blank of non-biofossil records in the Precambrian strata in Yunnan. This discovery is of great scientific signicance and scientific values in the study of the evolution of the Earth＇s environments and life during the early periods of the Earth＇s history.