Thick stratum was deposited in the west part of southern North China and the Ordos area during the Late Triassic, when the stable North China Craton turned into circum-Pacific tectonic tract.

• 晚三叠世是稳定的华北克拉通向构造活动剧烈的滨太平洋构造域过渡的时期,在南华北西部及鄂尔多斯地区沉积了巨厚的上三叠统。