Core Insights - The archaeological investigation in Mulan County has confirmed the discovery of an ancient city site from the Liao and Jin dynasties, significantly advancing the timeline of human activity in the region to approximately 7,000 years ago [1] Group 1: Archaeological Findings - The Mongol Mountain city site is located in the western mountainous area of Mulan County, featuring an inner city and outer defense layout [1] - The exploration has expanded the site area to 110,000 square meters, uncovering 115 ancient relics including house sites, kilns, and ash pits [1] - Artifacts primarily consist of pottery and porcelain fragments, with one pottery piece exhibiting characteristics of fishing and hunting culture, dated to around 7,000 years ago [1] Group 2: Technological Methods and Analysis - Carbon-14 dating techniques have confirmed that the main structure of the city site belongs to the Jin dynasty, with evidence of human activity from the mid-Qing period also discovered [1] - The project utilized low-altitude drone detection technology to clearly map the outline of the city site and the arrangement of house sites [1]