红山文化
The Lower Xiajiadian culture (; 2200–1600 BC) is an archaeological culture in Northeast China, found mainly in southeastern Inner Mongolia, northern Hebei and western Liaoning, China. Subsistence was based on millet farming supplemented with animal husbandry and hunting. Archaeological sites have yielded the remains of pigs, dogs, sheep and cattle. The culture built permanent settlements and achieved relatively high population densities. The population levels reached by the Lower Xiajiadian culture in the Chifeng region would not be matched until the Liao Dynasty. The culture was preceded by the Hongshan culture, through the transitional Xiaoheyan culture. The type site is represented by the lower layer at Xiajiadian, Chifeng, Inner Mongolia.