Five paleosoil samples and a piece of pottery collected from a trench wall at Shangdalai village

near Tu- motezuo county

located in the southern margin fault of Daqing Mountain

inner Mongolia

have been dated by radio- carbon dating and thermoluminensence dating

respectively. The radiocarbon age of total carbon

different organic fraction such as humic acid and humin separated from paleosoil and carbonate in the soil were obtained. These ages were then compared with to evaluate the reliability of the radiocarbon dating age of each fraction.