New Glires materials from the East Mesa, Erlian Basin (Nei Mongol, China)

Qian Li
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Abstract

East Mesa, an Eocene locality situated east of the Shara Murun River in the Erlian Basin, is characterized by basal lower red mudstones. However, a distinct depositional hiatus has been observed in these red mudstones, leading to their division into layers 1 and 2. Excitingly, recent discoveries respectively in layers 1 and 2 of the lower red mudstones at the East Mesa include new Glires (Gomphos sp.) and rodents such as Asiomys dawsoni, Gobiocylindrodon cf. G. ulausuensis, and Yuomys sp., marking their first occurrences within these horizons. A comparative analysis of small mammal faunas suggests that layer 1 may correspond to the Arshantan age, while layer 2 indicates a late Irdinmanhan age based on the combination of taxa found.
二连盆地东梅山(中国内蒙古)出土的格利尔斯新材料
东梅沙位于二连盆地沙拉木伦河以东的始新世地段,其特征是基底下部为红色泥岩。然而,在这些红色泥岩中发现了明显的沉积断裂,导致其分为第 1 层和第 2 层。令人兴奋的是,最近在东梅萨山下部红色泥岩的第 1 层和第 2 层分别发现了新的 Glires(Gomphos sp.)和啮齿类动物,如 Asiomys dawsoni、Gobiocylindrodon cf. G. ulausuensis 和 Yuomys sp.,这标志着它们首次出现在这些地层中。对小型哺乳动物群的比较分析表明,第 1 层可能属于阿尔山时代,而第 2 层根据发现的类群组合则表明属于伊丁曼罕晚期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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