Abstract: The first discovery of Asiocoryphodonin Yangxi formation on the northwest margin in Dangyang county is described in this paper.According to the lower jaw and tooth characteristics,it is assigned to be Asiocoryphodon cf.conicus Xu.The species was reported from Yuhuangding formation in Liguanqiao sag in Henan province.The age of the species is middle to late early Eocene.

摘要： 本文论述了产于江汉盆地西北缘当阳第三系洋溪组冠齿兽类化石的特征,根据下颌骨及牙齿特征定名为锥齿亚洲冠齿兽(相似种)Asiocoryphodon cf.conicus Xu,该种曾见于河南李官桥门陷玉皇顶组,其时代为早始新世中、晚期.

关键词: 江汉盆地, 始新世, 古脊椎动物学, 器官化石, 地质时代确定