Oligocene–Early Miocene Magnetochronology of the Mammalian Faunas in the Lanzhou Basin—Environmental Changes in the NE Margin of the Tibetan Plateau

Peng Zhang1, Hong Ao1, Mark J Dekkers2, Yongxiang Li3 and Zhisheng An1, (1)IEE Institute of Earth Environment, Chinese Academy of Sciences, State Key Laboratory of Loess and Quaternary Geology, Xi'an, China, (2)Utrecht University, Paleomagnetic Laboratory, Fort Hoofddijk, Utrecht, Netherlands, (3)Northwest University, Department of Geology, Xi'an, China