Trace Fossil Assemblages in the Miocene from Northeast Margin of Qaidam Basin and Its Sedimentary Environment
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摘要: 研究遗迹化石对于恢复古生物活动方式、习性和古环境具有重要意义。在柴达木盆地东北缘双湖地区中新统发现了遗迹化石。经鉴定，研究区的遗迹化石主要包括2大类4属4种：居住迹Palaeopycus heberti（赫伯特古藻迹），Skolithos verticalis（垂直石针迹）；进食迹Scoyenia gracilis（纤细斯柯茵迹）和Taenidium satanassi（箱形条带迹）。根据研究区的遗迹化石分布及沉积环境分析，该地可划分出一个遗迹组合：Scoyenia—Taenidium—Skolithos遗迹组合, 代表了潮湿气候条件下的浅湖环境。当前化石的发现填补了柴达木盆地东北缘双湖地区中新世遗迹化石研究的空白。Abstract: It is significant to study trace fossils for the recovery of paleontological activity patterns，habits and paleoenvironment. They can provide more exact information than body fossils. Trace fossils were found in the Miocene strata from northeast margin of the Qaidam Basin. The fossilbearing horizon is beside Tuosu Lake and Keluke Lake. The specimens occur in a finegrained siltstone. Trace fossils consist of 2 types including at least 4 ichnogenus and 4 ichnospecies: Palaeopycus heberti, Skolithos vertical, Scoyenia gracilis and Taenidium satanassi. The specimens are abundant and clear. Palaeopycus heberti and Skolithos vertical are attributed to Domichnia. Scoyenia gracilis and Taenidium satanassi are attributed to Fodinichnia. Based on the distribution and morphology of the trace fossils and analysis of paleoenvironment, one kind of assemblages is recognized: ScoyeniaTaenidium Skolithos assemblage, presents itself in shallow lacustrine sediments under moist climate. The discovery of trace fossils filled the biological and environmental data in the Qaidam Basin.
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Key words:
- trace fossil /
- lacustrine sedimentary environment /
- Miocene /
- Shuanghu area /
- Qaidam Basin
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