甘肃临夏盆地广河县古城的早中新世小哺乳动物化石
收稿日期: 2025-01-15
网络出版日期: 2025-04-18
基金资助
中国科学院前沿科学重点研究项目(QYZDY-SSW-DQC022);国家自然科学基金(42372028)
版权
Early Miocene micromammal fossils from Gucheng in Linxia, Gansu, China
Received date: 2025-01-15
Online published: 2025-04-18
Copyright
记述了中国科学院古脊椎动物与古人类研究所一野外队于2000年在甘肃临夏盆地广河县阿里麻土乡古城附近IVPP LX 200051地点的上庄组中采集的小哺乳动物化石，计3目7科13属，这一地点被称为古城动物群。其中11个属/种都已知最早出现在早中新世，表明该动物群的时代为早中新世。中国的早中新世已知被分为谢家和山旺早、晚两个期。古城动物群中缺少在谢家动物群中存在的Tataromys, Yindirtemys, Eucricetodon和Tachyoryctoides等古老种类，表明古城动物群比谢家动物群要晚。与此同时，在古城动物群中还存在Protalactaga, Megacricetodon和Gobicricetodon等最早都只在早中新世晚期出现的属，而且新种Sinolagomys guchengensis的形态也显示了其为早中新世较晚期的时代特征。这样，古城动物群的时代很可能为早中新世晚期，属山旺期，与欧洲陆生的MN 3/4带相当。古生态研究表明，古城地区在早中新世时仍以相当干燥的灌木-干旷草原环境为主要特征。
王伴月 , 邱铸鼎 , 李录 . 甘肃临夏盆地广河县古城的早中新世小哺乳动物化石[J]. 古脊椎动物学报, 2025 , 63(2) : 102 -132 . DOI: 10.19615/j.cnki.2096-9899.250417
The micromammal fossils collected from the Shangzhuang Formation of the Linxia Basin, Gansu, are described here. The assemblage consists of 16 species of 13 genera belonging to 7 families, including one new species and one taxon previously unknown from China. Among them 5 genera are Oligocene holdovers and 11 genera/species are known to make their first appearances in Early Miocene, indicating an Early Miocene age for the Gucheng Fauna. The absence of Oligocene survivors such as Tataromys, Yindirtemys, Eucricetodon and Tachyoryctoides, which usually occur in the Xiejian age of Early Miocene, and the presence of newcomers Protalactaga, Megacricetodon and Gobicricetodon, that made their first appearance only in the Shanwangian age of late Early Miocene, suggest that the Gucheng Fauna is of a later age of Early Miocene. The new species, Sinolagomys guchengensis, showing more derived morphology than in S. ulunguensis, seems to support an assessment of the fauna in Shanwangian age. Thus, the Gucheng Fauna may belong to late Early Miocene Shanwangian, partially equivalent to MN 3/4 of the European land mammal zonation. Ecological analysis of the fauna indicates that the palaeoecological condition of the Gucheng area might still be a predominantly arid shrub-steppe in late Early Miocene.
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