In the region from Jixian County of Tianjin City to Xinglong County of Hebei Province in eastern Yanshan,the sedimentary structures which present the spindle-shaped crack on the surface are widely developed in the fine clastic strata of the of the Changcheng Group of the Mesoproterozoic,and they have been explained as the metazoan trace fossils or the seismic-induced liquefied veins etc.

Based on the genesis of adakites, as well as other geological evidences, the paper is proposing that in Mid Late Yanshanian period the eastern part of China continent was probably a plateau, which was uplifted in Mid Late Jurassic and thinned after Early Cretaceous.