Over the last sixty year, there has still not been any definitive conclusion about precisely from when the city wall in the lower layer dates. It is generally agreed that it is later than the Yangshao period (4000-6000 years ago).
六十年來，城子崖下層城牆到底起於何時，考古學家一直沒有定論，一般只同意晚於仰韶時期（距今四千至六千年間）。