The 14Cdating data reveals that the fourth phase is much later than 1600 BC, which is believed the beginning of the Shang.
碳十四测年数据表明二里头文化四期上限不超过公元前1600。
2
Soil age and the distribution of buried ancient paddy at Chuodun site in Yangtze River Delta were determined using 14Cdating and other archeological methods.
方法以绰墩遗址埋藏的古稻田土壤为研究对象，根据14C和考古学方法确定了土壤成土年龄和分布；
3
The genus and species identification and 14cdating have been made for oyster seashell, and the analysis of grain-size, minerals, foraminifera and small seashell in fillers have also been made.