Introduction to trench No. G102: The trench numbered G102 belongs to the Tanshishan Culture period. It is about 2-3 meters deep, with a large mouth and a small bottom. The sides of the trench are slope-shaped and the bottom of the trench is slightly flat. The basic direction of the trench was discovered during the ninth and tenth archaeological excavations. Archaeologists also deliberately retained "key pillars" at the site, from which the cultural layer section of the trench can be clearly seen.