Then move on to Ruins at Dahe Village. In the autumn of 1964, a site of 300,000 square meters representing the Yangshan and Longshan cultures of the Neolithic Period was discovered at Dahe Village in the northern suburbs of Zhengshou. The ruins of house foundations, dating back five thousand years, show separate inner and outer rooms - indicating that group marriage probably no longer existed and that families in which young couples lived separately from their parents had appeared.