The sedimentary systems were alluvial fan-braided fluvial river-lacustrine depositional systems during the Paleocene-Eocene, and braided fluvial river-lacustrine depositional systems during the Oligocene-Miocene.

• 古新世－始新世发育冲积扇－辫状河－湖泊沉积体系，渐新世－中新世发育辫状河－湖泊沉积体系。