北京发现疑似汉代“界碑”摩崖石刻，或刷新最早纪录

Core Viewpoint - A newly discovered rock inscription in the northeastern part of Mentougou District, believed to be a boundary marker from the Han Dynasty, may potentially rewrite the record for the earliest known rock inscriptions in Beijing, dating back at least 1800 years [1][5]. Group 1: Discovery Process - The discovery was made during the fourth national cultural relics census, with the team receiving a tip from a hiker about a rock inscription featuring characters resembling "military capital boundary" [3][10]. - The team utilized advanced technology for the survey, including panoramic photography and real-time dynamic differential positioning to accurately document the location and details of the inscription [10][13]. Group 2: Historical Significance - Historical records indicate that the military capital county has been established since the Western Han Dynasty, and the name may be linked to nearby geographical features [5][8]. - If verified, this discovery would push back the timeline of known rock inscriptions in Beijing by over 300 years, as the oldest previously recorded inscription dates back to 1481 years ago [5][10]. Group 3: Ongoing Research and Community Involvement - The team is collecting data and creating a detailed record of the inscription, which will be further analyzed by experts to confirm its historical significance [15][19]. - The increased public engagement in cultural relics protection has contributed to the discovery, with citizens acting as informal contributors to the census efforts [17][19].