Based on the late Paleozoic fold basement, Simao Triassic sedimentary basin formed in the early continental-island arc collusion stage after the close of Paleo-Tethys ocean.

• 三叠纪沉积盆地建立在晚古生代褶皱基底之上,形成于古特提斯洋闭合后,造山早期的弧陆碰撞阶段。