Archeologists in northeast China have excavated over 4,000 sq.m. of a stone city erected during the Bronze Age, about 3,500 to 4,000 years ago, in what is now Beipiao City.

The large-scope dig, sponsored by the Liaoning Provincial Institute of Archaeology, will benefit the study of the city's construction, its social conditions and people's daily life in north China in ancient times, the experts said.

The project's leader said that the stone city was built wide at the bottom and narrow at the top. It is circled by a moat 3.5 to 4 meters deep.

During the last two years, the archeologists have unearthed more than 180 meters of city walls and two sections of the moat east and south of the city, 19 stone building sites, five stone- supported caves in the west part, and three stone walls and a stone cave in the northeastern area.

Also uncovered were over 1,000 of rare relics, including stone and bone ware, said the archeologists.