A set of seismo-deposition and seismites are discovered for the first time in the Lower Cretaceous Xiagou Formations and Zhonggou Formations in the Liugouzhuang and Kulongshan region, Qingnan Sag, Jiuxi Basin. They are combined sediments of argillaceous dolomite, dolomite-mudstone and argillaceous siltstone, with seismo-deposition characteristics such as fissure, synsedimentary deformation structure, vibratory-liquefied water-escape structure. In this area, the main recognized marks of seismo-deposition and seismites include vibratory-liquefied curl deformation, load cast and their associated structures, slump deformation between brittle and plastic sediments and slump turbidites, liquefaction of soft sediments and water-escape structure, and step intrabed faults and geofractures. The discovery of seismo-deposition and seismites in the Lower Cretaceous in the Liugouzhuang and Kulongshan region filled up the blank of the seismites study in this area and indicates that intense earthquake activity once occurred during the Lower Cretaceous period, based on which it could be presumed that the earthquake could affect other areas in the Qingnan Sag. In addition, seismite is expected to be discovered in other sags with resemble tectonic settings in the Jiuxi Basin and thus opening a new study field of seismite. The study of regional tectonic settings also shows that the intense tectonic activities of the Qingxi No. 1 and 509 synsedimentary faulted zones are the direct inducing factors of the seismo-deposition in the Lower Cretaceous in this area, which presents a scientific proof for the existence of seismites.