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从陕西洛南龙牙洞中采得哺乳动物化石３０多个属种，与之共存的有洛南直立人及其石制品。该动物群中同时具有古北区和东洋区的动物，为华北－华南动物地理区系间的一个过渡性动物群，时代为早更新世晚期，可与公王岭动物群对比。动物群的性质反映了当时洛南地区乃至秦岭东段为一温暖、湿润的森林草原环境，部分属种可能主要因为不适应急剧变化的气候而绝灭。
More than 30 species of mammalian fossils have been taken from the Longya Cave in Luonan, Shaanxi Province. Orangutans and their stone products co-exist with them. The fauna has both the Gubei area and the Dongyang area, and is a transitional fauna between the North China and South China animal geographies. The era is the early Pleistocene and can be compared with the Gongwangling fauna. The nature of the fauna reflects the warm and humid forest and grassland environment of the Luonan area and even the eastern part of the Qinling Mountains at the time. Some species may be extinct mainly because they do not meet the rapidly changing climate.