编辑：Leena SUKSELAINEN，Hannele PELTONEN，Anu KAAKINEN，张兆群
Small mammal taphonomy of three Miocene localities from Damiao, Nei Mongol, China
Leena SUKSELAINEN, Hannele PELTONEN, Anu KAAKINEN, ZHANG Zhao-Qun
Abstract Predation is the most common cause of death in small mammals. It also causes the greatest modification on their remains. Other postmortem processes, such as weathering, trampling, and transportation all modify bones and contribute to the forming assemblage. Here we examined three Miocene localities from Damiao, Nei Mongol, China with different fluvial subenvironments. The ages span from early Miocene to early late Miocene (ca 21–11.6 Ma). We describe the sedimentary context and taphonomic features of the small mammal assemblages, and identify the responsible agents for the fossil accumulations. Our study reveals predation as primary means of accumulation for all three localities. However, there is overprinting of other means of accumulation such as fluvial transportation and possibly signs of trampling at the two younger localities. Results indicate possibly different predators for all localities; owls for the oldest one, and diurnal birds of prey or mammalian agents for the younger two. We also show that systematic excavation for small mammals can be done, and in this way it may be possible to reduce some of the damage collecting always produces.
Keywords Nei Mongol, Neogene, micromammals, digestion, predation, fluvial deposits