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In 1938, J.G. Andexown and M. Colani, both French, discovered the archaeological site of Cai Beo. Since then Cai Beo was excavated three times, in 1972, 1973 and 1981. Objects unearthed include some 479 tools: pestles, triturable tables, hacks, caulkers, graters, etc; ceramic wares made of clay and sand; cookers; remains of ancient people; bones of fish and teeth of sounders, deer, mountain goats, etc. Cai Beo archaeological site belongs to the Ha Long civilization. Cai Beo's residents lived 6,475 - 4,200 years ago. This was the first group of people living in Vietnam's northeastern coastal region who knew how to catch fish and plant feeding crops.
Documents show that Cai Beo people were the link between Bac Son and Ha Long civilizations or they were the residents of the Neolithic age, about 4,000 years ago.
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