History of Pre-history in Written Records

Written Records are the mark between pre - history and history. There existed the Yu dynasty before the Xia dynasty, but the authenticity of written records of the Yu dynasty as well as its former dynasties was denied by doubtful scholars in the 1920s, in the result that culture in pre - history period could be proved only by the dug - out relics of the early years. The written records of this period ignored are a great loss to the study of ancient times, for many treasures cannot acquired from digging, such as various symbols and some important event that can be proved only by written records.