The red strata of a suite of bearing-dinosaur egg fossils are exposed in Xiaguan-Gaoqiu Basin of Henan Province. It has been called the Gaogou Formation, the Majiacun Formation, the Sangping Formation and the Xiaguan Formation, and the formal stratigraphic section has not surveied formerly. Because the invertebrate and plant fossils that can be used to can determined stratigraphic epoch have not discovered except the dinosaur and dinosaur egg fossils, so a monograph not yet came out. In recent years, the authers have surveied the systematic stratigraphic section and found the a abundent invertebrate and plant fossils in 2011 except new discovery of dinosaur fossil Baotianmansaurus. So, the establishment of the stratigraphic unit of the formation level and stratigraphic subdivision and correlation have already basic condition. This discovery indicates the Xiaguan Formation may be the early-middle Late Cretaceous in age, and most possibly the early-middle Turonian to the middle Campanian.