• 责任者：Liu Jun (Key Laboratory of Vertebrate Evolution and Human Origin ; Institute of Vertebrate Paleontology and Paleoanthropology ; Chinese Academy of Sciences ; Beijing 100044 ; China) ; Li Lu
• 刊名：Vertebrata Palasiatica
• 出版年：2013
• 卷期：51(2)
• 关键词：二马营组 ; Ermaying Formation ; 铜川组 ; Tongchuan Formation ; 铀—铅计时 ; U-Pb dating ; 山西 ; Shanxi Province
• 页码：p.162-168
• 图表：illus., 19 refs.
• 分类号：1200
• issnNo：ISSN1000-3118
• isbnNo：CN11-1905/Q

Sensitive High Resolution Ion Microprobe （SHRIMP） U-Pb dating was carried out using zircons from tufts in the Ermaying and Tongchuan formations of Shanxi, China. The results show weighted mean ages of 245.9 ± 3.2 Ma for a sample from Member II of the Ermaying Formation, 243.1 ± 3.9 Ma for a sample from Member I of the Tongchuan Formation, and 238.6 ±2.6 Ma and 234.6 ± 6.5 Ma for two samples from the upper part of Member II of the Tongchuan Formation. These ages indicate that the lower part of the Ermaying Formation, which contains the Shaanbeikannemeyeria assemblage, is mostly likely Lower Triassic in age, whereas, the Tongchuan Formation is likely late Anisian to Ladinian, Middle Triassic.