古脊椎动物学报2022，Vol.60Issue(1)：42-53,12.DOI:10.19615/j.cnki.2096-9899.210716
内蒙古阿拉善左旗乌兰塔塔尔最晚始新世-渐新世剖面的区域年代地层意义
Stratigraphical significance of Ulantatal sequence(Nei Mongol,China) in refining the latest Eocene and Oligocene terrestrial regional stages
摘要
Abstract
Robust regional chronostratigraphic framework is the basis of understanding climatic and faunal events in the geologic history.One of the most dramatic faunal turnovers of the past 50 million years in Asia is linked to the Eocene-Oligocene Transition (EOT) at about 34 Ma.However,the chronostratigraphic relationships between faunal modulation and geologic events associated with the EOT in China have remained uncertain before and after the epoch boundaries,mainly due to the scarcity of continuous records and problems in correlating and subdividing the classic areas containing abundant mammalian fossils.Past decades have seen developments in establishing Chinese regional Paleogene Land Mammal Ages,and albeit many ages are well constrained,some,such as those of the latest Eocene and the Oligocene,have remained unsettled.In this paper,we present how recent evidence from the fossiliferous Ulantatal sequence,Nei Mongol,China,provides better constraints to the latest Eocene and Oligocene Chinese Land Mammal ages (Baiyinian,Ulantatalian,and Tabenbulukian).We propose Ulantatal sequence as a new regional unit stratotype section of the Ulantatalian stage,and the lower boundary of Tabenbulukian stage to be reassigned to Chron C9r (27.7 Ma),with the lowest occurrence of Sinolagomys as the marker horizon.关键词
内蒙古/始新统/渐新统/层型剖面/地层对比/年代地层学/生物地层学/磁性地层学Key words
Nei Mongol/Eocene/Oligocene/stratotype section/stratigraphical correlation/chronostratigraphy/biostratigraphy/magnetostratigraphy分类
天文与地球科学引用本文复制引用
Joonas Wasiljeff,张兆群..内蒙古阿拉善左旗乌兰塔塔尔最晚始新世-渐新世剖面的区域年代地层意义[J].古脊椎动物学报,2022,60(1):42-53,12.基金项目
芬兰科学院基金(编号:316799)、中国科学院战略性先导科技专项(编号:XDB26000000)、中国科学院古生物化石发掘与修理专项、国家自然科学基金(批准号:41472003)、GeoDoc和Waldemar von Frenckell基金资助.The authors would like to thank the colleagues who have participated in the still ongoing field work in Nei Mongol and acknowledge fruitful discussions with Anu Kaakinen.We would also like to appreciate the insightful comments of the two reviewers Bai Bin and Li Qian.The study was supported by Academy of Finland (Grant No.316799 to Anu Kaakinen) and CAS (XDB26000000,and special fund for fossil excavation and preparation),NSFC (41472003),GeoDoc (JW),and Waldemar von Frenckell's Foundation (JW). （编号:316799）
