Late Miocene-Early Pliocene Biostratigraphy and Miocene/Pliocene Boundary in the Dongwan Section , Gansu
详细信息
- 责任者：Liu Liping (Key Laboratory of Evolutionary Systematic of Vertebrates ; Institute of Vertebrate Paleontology and Paleoanthropology ; Chinese Academy of Sciences ; Beijing 100044 ; China) ; Zheng Shaohua
- 刊名：Vertebrata Palasiatica
- 出版年：2011
- 卷期：49(2)
- 关键词：中新世 ; Miocene ; 上新世 ; Pliocene ; 地层界线 ; stratigraphic boundary ; 甘肃 ; Gansu Province
- 页码：p.229-240
- 图表：1 illus., 40 refs.
- 分类号：1200
- 出版序号：1120
- issnNo：ISSN1000-3118
- isbnNo：CN11-1905/Q
摘要
The Dongwan section is located near Dongwan Village, Qin’an County, Gansu Province (34°58’N, 105°47’E). Based on faunal composition of small mammals, especially the myospalacines, four biozones are recognized. According to the paleomagnetic study, the boundary of Miocene/Pliocene (5.33 Ma) is located at the depth of 35.5 m of the section, and coincides with the last appearances of Prosiphneus eriksoni and Ochotonoma primitiva. The Miocene/Pliocene boundary is 2 m lower than the boundary between biozoneⅡand Ⅲ, which is marked by the earliest appearance of Mesosiphneus sp. The continuous sequence and high density of fossil levels qualify the section as a candidate stratotype section of Yushean Stage.
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