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扼要地介绍了发现于江苏溧阳上黄水母山裂隙堆积中的一个中始新世（距今约4500万年）哺乳动物群，共12目。其中中华曙猿（Eosimiassinensis）的发现表明高级灵长类起源于亚洲而不是非洲的可能性更大；其它的众多发现表明亚洲的东南部是早第三纪哺乳动物主要类群演化的重要舞台。
A brief description of a middle Eocene (about 45 million years ago) mammal population found in the crevasse accumulation of the Upper Yellow Jellyfish in Liyang, Jiangsu, is presented, covering a total of 12 orders. Among them, the discovery of Eosimiassinensis shows that the higher primates are more likely to originate in Asia than in Africa. Other findings show that southeastern Asia is an important stage for the evolution of major mammalian groups in the early Tertiary.