陕西北部发现多个新近纪哺乳动物化石新地点及其意义  

Discovery of Neogene mammalian fossil new localities from Northern Shaanxi and its significance

作　　者：李永项[1] LI Yongxiang(State Key Laboratory of Continental Dynamics,Department of Geology,National Demonstration Center for Experimental Geology Education,Institute of Cenozoic Geology and Environment,Northwest University,Xi'an 710069,Shaanxi)

机构地区：[1]西北大学大陆动力学国家重点实验室,地质学国家级实验教学示范中心,新生代地质与环境研究所,陕西西安710069

出　　处：《第四纪研究》2023年第3期704-711,共8页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:42172010和41472013);国家重点研究发展规划(973项目)项目(批准号:2013CB955901)共同资助。

摘　　要：在陕北黄土高原下部的红土堆积中新发现29个新近纪哺乳动物化石地点,自北向南包括神木、榆阳、佳县、横山、子洲、志丹、安塞、甘泉等地,基本覆盖整个陕北黄土高原,填补了中新世时期中国哺乳动物地理格局中东西分界线附近的大片空白。动物组合以新近纪中国北方常见的三趾马动物群成员为主,包含有三趾马(Hipparion)、大唇犀(Chilotherium)、萨摩麟(Samotherium)、巨鬣狗(Dinocrocuta)、弓颌猪(Chleuastochoerus)、羚羊(Gazella)等,其组合特点类似于府谷老高川中部动物群。新发现的、多地点的化石材料进一步表明,在陕西北部晚中新世约6.7 Ma左右,森林-草原混合型三趾马动物群的分布可能相当广泛,而约7.8 Ma和约5.7 Ma两期的哺乳动物群的分布可能相对局限。A total of 29 new mammalian fossil sites are discovered from the Neogene red clay sequences of the Chinese Loess Plateau,Northern Shaanxi,e.g.Shenmu,Yuyang,Jiaxian,Hengshan,Zizhou,Zhidan,Ansai,Ganquan,almost covering the entire Chinese Loess Plateau in Northern Shaanxi.Biogeographically,the new fossil sites contribute to the mammalian distribution pattern in the Central China during the Miocene,just located at the east-west boundary.The fossil associations are characterized by the common of elements of the Neogene Hipparion faunas in Northern China,which including Hipparion,Chilotherium,Samotherium,Dinocrocuta,Chleuastochoerus,Gazella,etc.Which is similar to the fauna assemblages of middle Laogaochuan profile in Fugu County.The new fossil discoveries from above localities further indicates that the mixed forest-steppe Hipparion faunas may be widely distributed in northern Shaanxi during the Late Miocene(about 6.7 Ma),whereas the mammalian faunas probably had a relatively limited distribution during the periods of 7.8 Ma and 5.7 Ma.

关 键 词：新地点 哺乳动物化石 新近纪 陕西北部 

分 类 号：P534.62[天文地球—古生物学与地层学] Q915.2[天文地球—地质学] Q915.87[生物学—古生物学]