封面说明：陕西西安至蓝田间的白鹿塬北坡、灞河南岸出露连续的晚新生代地层，哺乳动物化石丰富。前景图为根据灞河组中部同一地点的骨骼化石制模装架而成的李氏羚羊(相似种) Gazella cf. G. lydekkeri骨架。这是迄今为止世界上发现的最为完整的Gazella羚羊化石，磁性地层学测定其生存年代约为8.9 Ma。背景图显示完整的地层剖面：剖面下部为晚中新世早.中期灞河组河湖相沉积，中部为晚中新世晚期至上新世蓝田组风成红粘土沉积，上部为第四纪黄土沉积。详见张兆群、杨睿文。

Cover image: In between Xi’an and Lantian, Shaanxi Province, along the northern slopes of Bailuyuan Plateau and south bank of Bahe River, there exposed well developed and continuous late Neogene sediments which recorded rich geological information. Rich fossils were discovered in this area, including the till now most complete fossils of Gazella in the world, named as Gazella cf. G. lydekkeri. The fossils were dated to 8.9 Ma by paleomagnetic stratigraphy. The background image shows the complete section: the early-middle Late Miocene Bahe Formation of fluvial-lacustrial sediments in the lower part, late Late Miocene to Pliocene Lantian Formation of eolian red clay in the middle, and topped by Quaternary loess sediments. Details in the paper of Zhang and Yang.