甘肃临夏盆地牙沟地区椒子沟组底部的小哺乳动物化石
Micromammal fossils from the basal part of the Jiaozigou Formation in Yagou area,Linxia Basin,Gansu Province
摘要
Abstract
Renewed fieldwork in 2003 produced a rich micromammal assemblage from the basal part of the Jiaozigou Formation in the Yagou area of Linxia Basin.17 genera distributed among 13 families of three orders were recovered.The micromammal fauna is a typical Oligocene assemblage for Central and Eastern Asia.14 genera(～82％of the fauna)are common in the Oligocene of Asia.Of them four genera and four species of Eucricetodon are restricted to the Oligocene,one genus(Bagacricetodon)is restricted to Late Oligocene and Glis and Eomyodon made their first appearances in the Late Oligocene.Based on this micromammal composition,the basal part of the Jiaozigou Formation in the Yagou area could be mainly of Late Oligocene in age,which is in accordance with the conclusion based on large mammal fossils.In comparison with the other Late Oligocene micromammal faunas in Central and East Asia,the Yagou Fauna is slightly older than the Ulan Ⅲ biozone of Nei Mongol and biozone C of Mongolia,because it has two Eocene genera and lacks more advanced genera.This is roughly in accordance with the recent palaeomagnetic interpretation for the Maogou section,where the lower boundary of the Jiaozigou Formation was correlated with Chron C10r(～29 Ma).The presence of large number of xerophilous zapodines,ctenodactylids,cricetids and lagomorphs combined with fossorial Tsaganomys and the lithology of the fossil-bearing deposits,composed of gypsiferous reddish brown mudstone,tend to show a semiarid woodland-shrubland habitat during the Late Oligocene in Yagou area.In Late Oligocene more frequent faunal interchange might have occurred between Asia and Europe(4 genera commonly shared)rather than between Asia and America(only 1 genus shared),partly because of the disappearance of the Turgai Strait.关键词
甘肃临夏牙沟/晚渐新世/椒子沟组/小哺乳动物化石Key words
Yagou,Linxia,Gansu/Late Oligocene/Jiaozigou Formation/micromammal fossils分类
生物科学引用本文复制引用
王伴月,邱占祥..甘肃临夏盆地牙沟地区椒子沟组底部的小哺乳动物化石[J].古脊椎动物学报(中英文),2023,61(4):284-316,33.基金项目
中国科学院前沿科学重点研究项目(编号:QYZDY-SSW-DQC022)资助. Acknowledgements The authors would like to express their gratitude to Profs.Qiu Zhuding,Zhang Zhaoqun,Wu Wenyu,Li Qian and Dr.Li Lu from Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences(IVPP)for their valuable discussion （编号:QYZDY-SSW-DQC022）
to Prof.Deng Tao of IVPP for his valuable geological information on the Jiaozigou Formation and field photographs （）
to Mrs.Feng Wenqing and Liang Zhong of IVPP and Chen Shanqin of Hezheng Paleozoological Museum of Gansu for their hard work in collecting micromammals in field.Many thanks are given to Dr.Larry Flynn from Harvard University,USA,for critiquing the manuscript and correcting the English.Many thanks are also given to Miss Si Hongwei of IVPP for the microphotographs and preparing the pictures and Mr.Gao Wei of IVPP for the photographs,and Mr.Xie Shuhua of IVPP for the preparation work on the specimens.This work is supported by the Frontier Science Key Research Project of the Chinese Academy of Sciences(QYZDY-SSW-DQC022). （QYZDY-SSW-DQC022）
