Initial incision of the Three Gorges and connection between the Upper and Middle Yangtze River since the Late Oligocene-early Miocene

Ruohong Jiao, University of Victoria, Victoria, BC, Canada, Chaoqun Yang, Tianjin University, School of Earth System Science, Tianjin, China and Chuanbo Shen, China University of Geosciences, Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, Wuhan, China